text stringlengths 1 1.11k | source dict |
|---|---|
homework-and-exercises, newtonian-mechanics, newtonian-gravity, time
(You also could have gotten to this point by relating gravitational potential energy to kinetic energy, and being careful about where you set the zero of the gravitational potential).
When $r = r_0$, $v = 0$, so $C = - \frac{4 \pi G r_0^2 \rho_0}{3}... | {
"domain": "physics.stackexchange",
"id": 54784,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "homework-and-exercises, newtonian-mechanics, newtonian-gravity, time",
"url": nu... |
quantum-mechanics, quantum-field-theory, special-relativity, photons, wavefunction
Title: Why can't photons be localized as wavepackets like massive particles can? What specifically goes wrong in the math if we try to model them this way? I've read several threads on what exactly a photon is and how it can't be modele... | {
"domain": "physics.stackexchange",
"id": 94851,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "quantum-mechanics, quantum-field-theory, special-relativity, photons, wavefunction... |
A} x\ln\left(x\right)\right\rbrack\quad}_{=\ 0} - 1\right\rbrace\ +\ \left\lbrace\left(1 + 1\right)\ln\left(1 + 1\right) - 1\vphantom{\Huge A}\right\rbrace \\[1cm]&&\mbox{} \end{eqnarray*} | {
"domain": "stackexchange.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9828232874658905,
"lm_q1q2_score": 0.8334024656180887,
"lm_q2_score": 0.847967764140929,
"openwebmath_perplexity": 798.5672217990559,
"openwebmath_score": 0.9840527176856995,
"tags... |
ros, catkin, build
Originally posted by bellonetom on ROS Answers with karma: 11 on 2018-01-10
Post score: 1
Original comments
Comment by jayess on 2018-01-10:
Welcome! What commands are you running and what tutorial are you following?
Your build is failing because the compiler cannot find the moveit/move_group_inte... | {
"domain": "robotics.stackexchange",
"id": 29716,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "ros, catkin, build",
"url": null
} |
fluid-dynamics, waves
But I don't get it why after the water has formed this something like a wall around my finger (not that I can see this moment; it's too quick), the wall starts to move towards the rim. Why doesn't the water just flow down the wall, like dry sand flows down a sand wall? Then I think the excess wat... | {
"domain": "physics.stackexchange",
"id": 4238,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "fluid-dynamics, waves",
"url": null
} |
pressure, biophysics
Title: Is there a pressure differential between the skin and any parts inside the human body? Since most of the human body is never directly exposed to the atmosphere, is there a meaningful difference in pressure between any internal organs and the skin?
If so, how do open wounds which expose the... | {
"domain": "physics.stackexchange",
"id": 27323,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "pressure, biophysics",
"url": null
} |
java, parsing, xml
Title: Retrieve data from an XML file in Java few months back I did a code test for a company and I quickly managed to solve it within 5-10 minutes. But, I got rejected because it wasnt "good enough".
What is good enough? they said its mainly how I wrote the code and that I was missing exception han... | {
"domain": "codereview.stackexchange",
"id": 44572,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "java, parsing, xml",
"url": null
} |
graphs, trees
Could be represented as
4,1 4,2 4,3 4,5 6,5
and a possible solution could be
1: parent:4, children: None
2: parent:4, children: None
3: parent:4, children: None
4: parent:None, children:1,2,3,5
5: parent:4, children: 6
6: parent:5, children: None
where 4 is the root. The tree in your diagram is undi... | {
"domain": "cs.stackexchange",
"id": 7641,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "graphs, trees",
"url": null
} |
c++, algorithm, array, reinventing-the-wheel
There's no point in declaring val as a static variable. In fact, you've killed any chance of it being usable in multi-threaded programs.
The body of the loop is performing an assignment in every single iteration when it doesn't need to. If you want it to be its best, you ... | {
"domain": "codereview.stackexchange",
"id": 1007,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c++, algorithm, array, reinventing-the-wheel",
"url": null
} |
java, object-oriented
Right now, your code stores the time of a course as a single point in time, but unless the length of a lesson of a course is fixed, this is not enough information, because you would need to store both the beginning and the end of the lesson. This creates the problem that an arbitrary Map<Time, Co... | {
"domain": "codereview.stackexchange",
"id": 30635,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "java, object-oriented",
"url": null
} |
Well, in that case and if we have no more information about the parameters $\displaystyle a_i,b_i$ this could be a large, large,...., large problem with a lot of cases to analyze depending on the form of the boundary. | {
"domain": "mathhelpforum.com",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9848109485172558,
"lm_q1q2_score": 0.8051562910063641,
"lm_q2_score": 0.817574471748733,
"openwebmath_perplexity": 282.0188869304593,
"openwebmath_score": 0.8759370446205139,
"... |
equation Current developments. Physics Matlab, doing Physics with Matlab. Browse The Most Popular 2 Matlab Fem 1d Poisson Equation Open Source Projects. In an earlier work [18], we developed an FFT-based direct Poisson solver. The Finite Element Method (FEM) is a means for solving ordinary or, more often, partial diffe... | {
"domain": "uprs-berlin.de",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9615338068793908,
"lm_q1q2_score": 0.8210659747264522,
"lm_q2_score": 0.853912747375134,
"openwebmath_perplexity": 1254.2375214052329,
"openwebmath_score": 0.5879030227661133,
"tags":... |
ros, navigation, teb-local-planner, costmap
Comment by croesmann on 2016-05-20:
Oh, ok, your wheelbase is approx. 1.8m: so probably a larger robot ;) do not forget to define a footprint model for optimization (e.g. Line model). And I often recommend to set the planner_frequency of the global plan to a small value in o... | {
"domain": "robotics.stackexchange",
"id": 24623,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "ros, navigation, teb-local-planner, costmap",
"url": null
} |
complexity-theory, reductions
0 &\mapsto (0,1) \\
1 &\mapsto (1,0) \\
\lor(a,b) &\mapsto (\lor(a_+,b_+),\land(a_-,b_-)) \\
\land(a,b) &\mapsto (\land(a_+,b_+),\lor(a_-,b_-)) \\
\lnot(a) &\mapsto (\land(a_-,a_-),\land(a_+,a_+))
\end{align*}
$$
After applying this transformation, we obtain a monotone circuit with $2$ ou... | {
"domain": "cs.stackexchange",
"id": 7363,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "complexity-theory, reductions",
"url": null
} |
ros2, slam
# ROS Parameters
odom_frame: odom
map_frame: map
base_frame: base_footprint
scan_topic: /scan
mode: mapping # mapping, localization
# if you'd like to immediately start continuing a map at a given pose
# or at the dock, but they are mutually exclusive, if pose is given
# wil... | {
"domain": "robotics.stackexchange",
"id": 38561,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "ros2, slam",
"url": null
} |
ros
Originally posted by Dimitri Schachmann with karma: 789 on 2015-10-26
This answer was ACCEPTED on the original site
Post score: 7
Original comments
Comment by ben.gill on 2015-10-26:
Thanks Dimitri,
It seems that didn't ask my question that clearly. I had reviewed the msg documentation, and could understand the m... | {
"domain": "robotics.stackexchange",
"id": 22834,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "ros",
"url": null
} |
fourier-transform, software-defined-radio
I understand how, mathematically, this multiplication with the negative frequency will shift the signal spectrum to the left by $f_c$ Hz, but what I don't understand is how a local oscillator can physically achieve this. The negative frequency in the behavioral model does not ... | {
"domain": "dsp.stackexchange",
"id": 9297,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "fourier-transform, software-defined-radio",
"url": null
} |
java, algorithm, recursion, weekend-challenge, sudoku
} | {
"domain": "codereview.stackexchange",
"id": 5342,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "java, algorithm, recursion, weekend-challenge, sudoku",
"url": null
} |
ros, messages, namespaces, packages
Message types use standard ROS naming
conventions: the name of the package +
/ + name of the .msg file. For
example, std_msgs/msg/String.msg has
the message type std_msgs/String.
In your example, it could make sense to make a generic vehicle message say pkgname/GenericVehicle.msg a... | {
"domain": "robotics.stackexchange",
"id": 25083,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "ros, messages, namespaces, packages",
"url": null
} |
ros, multimaster, multiplemachines
Originally posted by weiin with karma: 2268 on 2012-04-17
This answer was ACCEPTED on the original site
Post score: 0 | {
"domain": "robotics.stackexchange",
"id": 8993,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "ros, multimaster, multiplemachines",
"url": null
} |
c#, hash-map
public int Count => primary.Count;
public ICollection<TFirst> PrimaryKeys => primary.Keys;
public ICollection<TSecond> SecondaryKeys => secondary.Keys;
// This should be useful only for enumeration by TSecond as key
public IReadOnlyDictionary<TSecond, TFirst> Inverse => secondary;
p... | {
"domain": "codereview.stackexchange",
"id": 35840,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c#, hash-map",
"url": null
} |
c++, c++11, template, lambda
This can be done without recursion in two lines:
Do{row->getValue(std::get<N>(args))...};
action(std::get<N>(args)...);
where args is a tuple.
Range
Ok, now let's step back to see how this is possible. First, we learn how to count from 0 to a given number L, in order to construct range 0... | {
"domain": "codereview.stackexchange",
"id": 6746,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c++, c++11, template, lambda",
"url": null
} |
python, parsing, yaml
def parse_args(self):
args = self.parser.parse_args()
if args.config_file:
data = yaml.load(args.config_file)
delattr(args, 'config_file')
for key, value in data.items():
if isinstance(value, list):
for v in v... | {
"domain": "codereview.stackexchange",
"id": 11886,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python, parsing, yaml",
"url": null
} |
c#, asp.net-mvc
[{"MeetingPollingQuestionId":1,"MeetingPollingQuestionType":"LongAnswerText","MeetingPollingId":1,"SequenceOrder":1,"MeetingPollingParts":[{"MeetingPollingPartsId":1,"Type":"Question","MeetingPollingQuestionId":1,"MeetingPollingPartsValues":[{"MeetingPollingPartsValuesId":1,"Type":"label","QuestionValu... | {
"domain": "codereview.stackexchange",
"id": 43995,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c#, asp.net-mvc",
"url": null
} |
heat-engine
I always though, that exhaust manifold and intake manifold are separated, so exhaust gases just can't possibly enter other cylinders combustion chambers as described in the above quoted text.
Can exhaust gases be diverted into other cylinders as claimed in that text? The exhaust and the intake are separat... | {
"domain": "physics.stackexchange",
"id": 5327,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "heat-engine",
"url": null
} |
java, performance, strings
if(!y)
One way to fix:
if(!y && i > 0)
Another way is to initialize y to true.
(Notice that with this variable name,
it's hard to understand the logical meaning of this.)
Readability
@TopinFrassi was too kind.
I find this code extremely hard to read,
mostly due to the poor naming throughou... | {
"domain": "codereview.stackexchange",
"id": 16858,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "java, performance, strings",
"url": null
} |
of the Z-value in bold. The closest table area is. How many goals are closest to a z score of 0? The post Central Tendency, Variability, Normal Curve, z Scores, Probability, and Binomial Distribution appeared first on theFreshEssays. 0, there is a high probability of the company going bankrupt. On the other hand, if wh... | {
"domain": "dwvu.pw",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9861513881564149,
"lm_q1q2_score": 0.8039426510446845,
"lm_q2_score": 0.815232489352,
"openwebmath_perplexity": 521.3509578685332,
"openwebmath_score": 0.8338238000869751,
"tags": null,
... |
parsing, haskell, parsec, verilog
main :: IO ()
main = do
args <- getArgs
let results = map (parse parseNumber "parseNumber") args
mapM_ print results
Note: In true Verilog numbers have the format <size>'<signed><radix>value but in my application negative numbers are not allowed, hence the omission of <signed>.... | {
"domain": "codereview.stackexchange",
"id": 21159,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "parsing, haskell, parsec, verilog",
"url": null
} |
general-relativity, gravity, differential-geometry, metric-tensor, relativity
Title: How to write arbitrary line elements in isotropic form? I have the following metric
$$(ds)^2 = A(r) dt^2 + 2B(r) drdt - C(r)dr^2 - r^2d\Omega^2,$$
where $d\Omega^2 = d\theta^2 + \sin^2 \theta \;d\phi^2$.
Is it possible to write this m... | {
"domain": "physics.stackexchange",
"id": 41702,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "general-relativity, gravity, differential-geometry, metric-tensor, relativity",
... |
java, swing, text-editor
should be
JLabel label = new JLabel("Ln 1, Col 1");
label.setFont(new Font("Arial", Font.PLAIN, 15));
for(int i=0 ; i<m.getItemCount() ; i++)
should be
for (int i = 0; i < m.getItemCount(); i++)
You are squashing exceptions without any explanation. If there is a sound reason to squash, i... | {
"domain": "codereview.stackexchange",
"id": 29188,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "java, swing, text-editor",
"url": null
} |
breathing
Title: If we change our breathing rate so easily, then what is the point of measuring it? When we are self-conscious of our own breathing, its rate changes very easily. Therefore, if it changes so easily, what is the point in measuring it?
Thank you for your time and effort We may be able to voluntarily cont... | {
"domain": "biology.stackexchange",
"id": 3371,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "breathing",
"url": null
} |
example
``````[p,S,mu] = polyfit(x,y,n)``` also returns `mu`, which is a two-element vector with centering and scaling values. `mu(1)` is `mean(x)`, and `mu(2)` is `std(x)`. Using these values, `polyfit` centers `x` at zero and scales it to have unit standard deviation,$\stackrel{^}{x}=\frac{x-\overline{x}}{{\sigma }_... | {
"domain": "mathworks.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9871787830929849,
"lm_q1q2_score": 0.8330753442736298,
"lm_q2_score": 0.8438951064805861,
"openwebmath_perplexity": 776.9892564091139,
"openwebmath_score": 0.7791977524757385,
"tags": ... |
quantum-mechanics, angular-momentum, group-theory, matrix-elements, wigner-eckart
Here the notation is not quite the same as your $F$ is my $j$ and that kind of stuff but that’s the basic idea: your tensor acts only on the $J$ part of the state so you need to decouple-recouple various J’s, I’s and F’s to change from t... | {
"domain": "physics.stackexchange",
"id": 92104,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "quantum-mechanics, angular-momentum, group-theory, matrix-elements, wigner-eckart"... |
vba, excel, time-limit-exceeded
Sub RunAH_KeyWordLibrary()
Call PrepareKeywords
Call PrepareLibrary
End Sub
Private Sub PrepareKeywords()
Application.ScreenUpdating = False
Application.Calculation = xlManual
Application.DisplayStatusBar = False
Application.EnableEvents = False
Application.... | {
"domain": "codereview.stackexchange",
"id": 19995,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "vba, excel, time-limit-exceeded",
"url": null
} |
hamiltonian
And now, crucially, if the off diagonal elements of a matrix are relatively small compared to the diagonals, it is a mathematical theorem that they don't affect the eigenvalues much [2].
A transmon is exactly a circuit where $E_C \ll E_J$, so we are indeed in a case where the off-diagonal terms are smaller... | {
"domain": "physics.stackexchange",
"id": 92293,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "hamiltonian",
"url": null
} |
species-identification, entomology
My best guess it is baby of Earwig (2000 species): If I look at the posterior part of the body I can "see" the preliminary forceps as well as other similar features, but still the accuracy of the ID is limited.
Enhanced image: | {
"domain": "biology.stackexchange",
"id": 4343,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "species-identification, entomology",
"url": null
} |
performance, php, object-oriented, sql, security
Query Example:
SELECT MasterProducts.*, Prod_Profile.*, Prod_Det_Info.*, Prod_Det_Cost.*, Prod_Det_Price.*, Prod_PriceP.*, Prod_Cost_Prom_Men.*, Prod_Price_Net_Hist.* FROM MasterProducts
LEFT JOIN (SELECT Prod_Profile.* FROM Prod_Profile) AS Prod_Pro... | {
"domain": "codereview.stackexchange",
"id": 42184,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "performance, php, object-oriented, sql, security",
"url": null
} |
quantum-field-theory, correlation-functions, classical-field-theory
However, I feel that the answer to the following question is missing to have a complete understanding of the subject. Consider a QFT that has a classical analog. In the QFT we have the $n$-point functions $\left<\phi(x_1)\cdots \phi(x_n)\right>$. If w... | {
"domain": "physics.stackexchange",
"id": 44998,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "quantum-field-theory, correlation-functions, classical-field-theory",
"url": nul... |
rviz, qt
Title: rviz segfault in fuerte
Hello everyone,
I just started using ROS and had a problem with rviz.
rosrun rviz rviz
[ INFO] [1337948693.539857743]: rviz revision number 1.8.11
[ INFO] [1337948693.540013978]: compiled against OGRE version 1.7.3 (Cthugha)
Segmentation fault (core dumped)
I tried different ... | {
"domain": "robotics.stackexchange",
"id": 9543,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "rviz, qt",
"url": null
} |
urdf, xacro
-> display.launch
<launch>
<arg
name="model" />
<arg
name="gui"
default="False" />
<param
name="robot_description"
textfile="$(find CamPanTilt)/robots/CamPanTilt.URDF" />
<param
name="use_gui"
value="$(arg gui)" />
<node
name="joint_state_publisher"
pkg="joint_... | {
"domain": "robotics.stackexchange",
"id": 22539,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "urdf, xacro",
"url": null
} |
homework-and-exercises, electromagnetism, quantum-electrodynamics, hamiltonian, dirac-equation
Title: Question about the deduction of Hamiltonian of Schwinger model In Sidney Coleman's paper More about massive schwinger model (PDF). Discuss about some property of massive (1+1)D QED model, In page 5 of this paper, Cole... | {
"domain": "physics.stackexchange",
"id": 93946,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "homework-and-exercises, electromagnetism, quantum-electrodynamics, hamiltonian, di... |
javascript, design-patterns, node.js
Title: Creating an async consumable object in Node Background
I have a situation where I have fixed number of objects with their own routines that would need to be called with the same initial message.
To accomplish this, I have a Factory that binds objects to a Composite object w... | {
"domain": "codereview.stackexchange",
"id": 13081,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "javascript, design-patterns, node.js",
"url": null
} |
Frequency Relative Frequency Relative Frequency Frequency 1 17.17 1681.1681 -2 17.17 1678.1678 3 16.16 1626.1626 -4 18.18 1696.1696 5 16.16 1686.1686 -6 16.16 1633.1633 Table 6.1: Frequencies for dice game. Var [X] = sum (p (x1). Var(X) = E[ (X – m)2 ] where m is the expected value E(X). The expected value (... | {
"domain": "calcidrata.pt",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9867771798031351,
"lm_q1q2_score": 0.804452821156376,
"lm_q2_score": 0.8152324938410783,
"openwebmath_perplexity": 201.43887900119626,
"openwebmath_score": 0.950570285320282,
"tags": n... |
general-relativity, cosmology, metric-tensor, symmetry, vector-fields
Title: Understanding Killing vectors of FLRW metric I am trying to understand how to calculate the Killing vectors of FLRW metric
\begin{equation}
ds^2 = dt^2 - R(t)^2\left( \frac{dr^2}{1 - k r^2} + r^2 d\theta^2 + r^2 \sin\theta d\phi^2\right).
\en... | {
"domain": "physics.stackexchange",
"id": 88254,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "general-relativity, cosmology, metric-tensor, symmetry, vector-fields",
"url": n... |
reflection, refraction, dispersion
Again - the rays that you do not see are sent somewhere else. You can see them if you move around, but then you cannot see the rays that you were seeing in your previous location.
That means that a single cone from a single droplet can contribute to different parts of different rainb... | {
"domain": "physics.stackexchange",
"id": 23983,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "reflection, refraction, dispersion",
"url": null
} |
rust, lexical-analysis, compiler
Note that I also eliminated the manual cursors here:
content now points to the not-yet-parsed slice.
iterable points to the not-yet-parsed char view of the slice.
There's thus no need to keep a "current" index, and we should aim at eliminating the "peek" index.
Mutation: eliminate si... | {
"domain": "codereview.stackexchange",
"id": 44371,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "rust, lexical-analysis, compiler",
"url": null
} |
programming-languages
where branchTaken is an otherwise unused boolean variable.
But this is terribly inconvenient to use in practice!
So, programming languages tend to include if, even if not strictly needed.
Now, about while (ans similar unbounded loops). We said that we need some construct for unbounded looping/rec... | {
"domain": "cs.stackexchange",
"id": 10759,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "programming-languages",
"url": null
} |
quantum-mechanics, electrons, wavefunction, probability, atoms
Now this is my question. Let's suppose an electron wandered far away such that now it is more closer to the nucleus of another atom than it is to it's original atom's nucleus. Now how does the electron know that which atom did it originally belong to? And ... | {
"domain": "physics.stackexchange",
"id": 62771,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "quantum-mechanics, electrons, wavefunction, probability, atoms",
"url": null
} |
evolution
I'd warn though that the diagram is not very accurate, and additions I'd make would complicate it further as a bush (rather than a tree). Each branch root itself is an instance of cladogenesis, and for this reason the diagram is not very accurate (e.g. fungi and metazoans seem to arise within the same "branc... | {
"domain": "biology.stackexchange",
"id": 12125,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "evolution",
"url": null
} |
This gives the cycle index $$Z(C_8) = \frac{1}{8} (a_1^8 + a_2^4 + 2 a_4^2 + 4 a_8).$$
The desired value is given by $$[z^{16}] Z(C_8)\left(\frac{1}{1-z}\right).$$ This is $$\frac{1}{8} \left([z^{16}] \left(\frac{1}{1-z}\right)^8 + [z^{16}] \left(\frac{1}{1-z^2}\right)^4 + 2 [z^{16}] \left(\frac{1}{1-z^4}\right)^2 + 4... | {
"domain": "stackexchange.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9869795095031688,
"lm_q1q2_score": 0.8349278499259819,
"lm_q2_score": 0.8459424353665381,
"openwebmath_perplexity": 333.1118282110003,
"openwebmath_score": 0.7476515769958496,
"tag... |
python, scikit-learn, decision-trees, multiclass-classification, multilabel-classification
Title: Forcing a multi-label multi-class tree-based classifier to make more label predictions per document I'm been experimenting with tree based classifiers for multi-label document classification. All the trees I've created, h... | {
"domain": "datascience.stackexchange",
"id": 4174,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python, scikit-learn, decision-trees, multiclass-classification, multilabel-cla... |
java, game
//The value is used as the key for the new map
//increment the number of cards and put it back in the map
if (key.equals("creatureType")) {
if (creatureTypes.get(value) == null) {
creatureTypes.put(value, cardCount);
} else {
... | {
"domain": "codereview.stackexchange",
"id": 10440,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "java, game",
"url": null
} |
But as you can see I'm wrong.
I think that there is a step involving absolute value that I oversee/don't understand. So could you please explain by which property or rule of square root is this problem solved?
Nicely put question.
You are right about the absolute value missing somewhere. Indeed, we have:
$$\sqrt{x^... | {
"domain": "stackexchange.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9805806546550657,
"lm_q1q2_score": 0.8295147889764851,
"lm_q2_score": 0.8459424373085146,
"openwebmath_perplexity": 126.77710357832116,
"openwebmath_score": 0.8364859223365784,
"ta... |
reference-request, books
Software Methodology and Engineering
6.1 No Silver Bullet — Essence and Accidents of Software Engineering (Frederick P. Brooks)
6.2 Guarded Commands, Nondeterminancy, and Formal Derivation of Programs (Edsger W. Dijkstra)
6.3 Go To Statement Considered Harmful (Edsger W. Dijkstra)
6.4 Proof o... | {
"domain": "cs.stackexchange",
"id": 7304,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "reference-request, books",
"url": null
} |
temperature, atmospheric-science
Actual Vapor Pressure (ea) =
RH / 100 * es
Vapor Pressure Deficit =
ea - es
Why this is a meaningful measurement: "The strain under which an organism is placed in maintaining a water balance during temperature changes is much more clearly shown by noting the vapor pressure deficit t... | {
"domain": "physics.stackexchange",
"id": 36531,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "temperature, atmospheric-science",
"url": null
} |
php, security, pdo
/**
* @param array $groupBy - The fields by which the result set should be grouped. Optional for query build.
* @return The object for chaining
*/
public function groupBy(array $groupBy) {
foreach($groupBy as $value) {
$this->groupBy[] = $value;
}
... | {
"domain": "codereview.stackexchange",
"id": 882,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "php, security, pdo",
"url": null
} |
c, reinventing-the-wheel, numerical-methods, floating-point
union decompose {
TYPE f;
struct decompose_s {
mantissa m:MANTISSA_SIZE;
exponent e:EXPONENT_SIZE;
sign s:SIGN_SIZE;
} __attribute__((packed)) o;
};
static inline union decompose decompose(TYPE f)
{
union decompose res... | {
"domain": "codereview.stackexchange",
"id": 36038,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c, reinventing-the-wheel, numerical-methods, floating-point",
"url": null
} |
c#, .net, sql
private void someButton_Click(object sender, EventArgs e)
{
List<string> teamLeaders = new List<string>();
if (dbHelper.Open())
{
teamLeaders = dbConn.GetTeamLeaders(textboxTeam.Text);
dbHelper.Close();
}
else
{
retu... | {
"domain": "codereview.stackexchange",
"id": 3310,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c#, .net, sql",
"url": null
} |
the... Converge in a triangle is equal to s r sr s r would... Three angle bisectors intersect the basic properties of Triangles Students should drag the vertices of the to... On average speed word problems on sum of the incenter point always lies inside for right,,... Triangle sides equal to s r sr s r form different T... | {
"domain": "usiad.net",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.966914017797636,
"lm_q1q2_score": 0.805753236585167,
"lm_q2_score": 0.8333245994514084,
"openwebmath_perplexity": 747.350125511502,
"openwebmath_score": 0.5591885447502136,
"tags": null,
... |
python
Nationality:
your nationality, dual nationality, and any additional work authorization if
applicable
Languages:
languages other than English and ability level eg. German (fluent)
""" | {
"domain": "codereview.stackexchange",
"id": 45306,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python",
"url": null
} |
ruby, array, hash-map
Title: Splitting a text file into paragraphs and words I'm iterating through a number of text files, trying to locate all carriage-returns, and individually save the text between carriage-returns. I get the index numbers of all carriage-returns, but I haven't got the slightest about saving the te... | {
"domain": "codereview.stackexchange",
"id": 5398,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "ruby, array, hash-map",
"url": null
} |
$$a_i = \frac{\mathrm{det}(M_i)}{\mathrm{det}(M)}$$
where where $$M_{i}$$ the matrix formed by replacing the $$i$$-th column of $$M$$ by the column vector $$b$$.
For your above observations we would be solving: $$$$\begin{bmatrix} 5 & 3.5 & 26.25 & 60.875 \\ 3.5 & 26.25 & 60.875 & 248.0625 \\ 26.25 & 60.875 & 248.062... | {
"domain": "stackexchange.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9907319847035466,
"lm_q1q2_score": 0.8053336443648629,
"lm_q2_score": 0.8128673110375457,
"openwebmath_perplexity": 134.50250765286907,
"openwebmath_score": 1.0000029802322388,
"ta... |
galaxy-clusters
This can be rewritten by assuming a new combined potential
$$ \Psi = -\frac{GM_r}{r} - \frac{1}{2}\Omega^2 r^2\sin^2 \theta$$
so that
$$ \frac{1}{\rho} \nabla P = -\nabla \Psi $$
In general then, the pressure gradient is no longer in the radial direction, however the isobars are still equipotentials.
... | {
"domain": "physics.stackexchange",
"id": 26083,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "galaxy-clusters",
"url": null
} |
javascript, jquery, playing-cards
.flex-container {
padding: 0;
margin: 0;
display: flex;
justify-content: space-between;
max-width: 100%;
overflow: auto;
/*border: 1px solid red*/
}
<link href="check.css" rel="stylesheet" />
<link href="BlackJack.css" rel="stylesheet" />
<h3>Simple Javascr... | {
"domain": "codereview.stackexchange",
"id": 35048,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "javascript, jquery, playing-cards",
"url": null
} |
electromagnetism, magnetostatics
An answer is given below it, but it is not very formal (in the mathematical sense). The problem is that I do not understand why $\mathbf E$ is uniform in the conductor and the answer assumes this without proof.
Any hints on how to prove $\mathbf E$ is uniform and parallel to the axis (... | {
"domain": "physics.stackexchange",
"id": 62131,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "electromagnetism, magnetostatics",
"url": null
} |
python, performance, python-3.x, genetic-algorithm, traveling-salesman
for i in range(0, gen):
pop = next_gen(pop, elite_size, mutation_rate)
print("Final distance: " + str(1 / determine_fit(pop)[0][1]))
best_route_index = determine_fit(pop)[0][0]
best_route = pop[best_route_index]
print(best_... | {
"domain": "codereview.stackexchange",
"id": 44616,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python, performance, python-3.x, genetic-algorithm, traveling-salesman",
"url... |
performance, beginner, c, programming-challenge, primes
int i;
int y = 0;
int z = 0; | {
"domain": "codereview.stackexchange",
"id": 9003,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "performance, beginner, c, programming-challenge, primes",
"url": null
} |
$\displaystyle R=\prod_{i=1}^k M_{n_i}(F_i),$
for some finite fields $F_i.$ Since $R$ is not a field, we have either $n_i >1$ for some $i$ or $n_i=1$ for all $i$ and $k \ge 2.$ If $n_i > 1$ for some $i,$ then $M_{n_i}(F_i),$ and hence $R,$ will have a non-zero nilpotent element and we are done. If $n_i=1$ for all $i$ ... | {
"domain": "wordpress.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9715639702485929,
"lm_q1q2_score": 0.8158552617390901,
"lm_q2_score": 0.8397339616560072,
"openwebmath_perplexity": 64.30341287783034,
"openwebmath_score": 0.9631590247154236,
"tags": ... |
python, beginner, python-3.x, vigenere-cipher, encryption
PEP-8
Few points from PEP-8 guide:
Surround top-level function and class definitions with two blank lines.
Use blank lines in functions, sparingly, to indicate logical sections.
Constants are usually defined on a module level and written in all capital letters... | {
"domain": "codereview.stackexchange",
"id": 39763,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python, beginner, python-3.x, vigenere-cipher, encryption",
"url": null
} |
quantum-mechanics, schroedinger-equation, potential-energy, scattering, discrete
Title: Asymmetric potential well and discrete energy levels Let us consider an asymmetric potential, which is piecewise defined as $V_1$ for $x<0$, $0$ when $0<x<a$ and $V_2$ for $x>a$, together with the condition $V_1 > V_2 >0$.
In the f... | {
"domain": "physics.stackexchange",
"id": 80746,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "quantum-mechanics, schroedinger-equation, potential-energy, scattering, discrete",... |
A binary relation $R$ over a set $X$ is symmetric when :
$\forall a,b \in X ( aRb \rightarrow bRa )$.
An example of symmetric relation : "... is married to _".
A binary relation $R$ on a set $X$ is asymmetric when :
$\forall a,b \in X ( aRb \rightarrow \lnot(bRa) )$.
An example of asymmetric relation : "... is fat... | {
"domain": "stackexchange.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9693241969600769,
"lm_q1q2_score": 0.8295972257513995,
"lm_q2_score": 0.8558511469672594,
"openwebmath_perplexity": 653.4680481776161,
"openwebmath_score": 0.8505833745002747,
"tag... |
statistical-mechanics, entropy
equilibrate more microstates become accessible. Think of the system spreading in the phase space. Thus entropy increases. Once the system has reached complete thermodynamic equilibrium no more entropy increase in possible. All allowable microstates have been made accessible and equally p... | {
"domain": "physics.stackexchange",
"id": 96286,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "statistical-mechanics, entropy",
"url": null
} |
javascript, sorting, search
According to above scores we also have this ranking:
User A: #1
User B: #2
User C: #2
User D: #3
User E: #4
User F: #5
This ranking method follows the Dense Ranking method.
Then we have a user named alice. If she gets 55 points, she will rank at position #6 (according to ranking above).
... | {
"domain": "codereview.stackexchange",
"id": 38607,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "javascript, sorting, search",
"url": null
} |
black-hole, singularity
But if we put these doubts aside and return to what you asked, the answer is that in the Kerr metric the ring singularity really is a ring and not a collection of points. | {
"domain": "astronomy.stackexchange",
"id": 3527,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "black-hole, singularity",
"url": null
} |
python, finance
def deposit(self, amount):
"""make a deposit"""
self.balance += amount
def withdraw(self, amount):
"""make a withdraw"""
if amount > self.balance:
raise ValueError("insufficient funds")
self.balance -= amount
def get_balance(self): #are acce... | {
"domain": "codereview.stackexchange",
"id": 25213,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python, finance",
"url": null
} |
c#, object-oriented, design-patterns, comparative-review, interview-questions
You are on a team that is creating a program to model stress on furniture. Your task is to model the behavior of furniture under abuse such as excessive weight or application of fire.
Someone has already created a prototype with a base class... | {
"domain": "codereview.stackexchange",
"id": 25429,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c#, object-oriented, design-patterns, comparative-review, interview-questions",... |
Find remainder after dividing $29 \times 2901 \times 2017$ by $17$.
Work $\mod 17$ !
\begin{align} & 29 \times 2901 \times 2017 \\ & 12 \times 1201 \times 317 \\ & 12 \times 1201 \times 147 \\ & 12 \times 351 \times 62 \\ & 12 \times 11 \times 11 \\ & 1452 \\ & 602 \\ & 92 \\ & 7. \end{align}
• This is much easier i... | {
"domain": "stackexchange.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9896718496130619,
"lm_q1q2_score": 0.848908945205452,
"lm_q2_score": 0.8577681031721325,
"openwebmath_perplexity": 1021.074271735373,
"openwebmath_score": 0.9999233484268188,
"tags... |
java, spring
import static org.junit.Assert.*;
import static org.mockito.ArgumentMatchers.any;
import static org.mockito.Mockito.when;
@RunWith(MockitoJUnitRunner.class)
public class AccountServiceTest {
@Mock
AccountRepository accountRepository;
@InjectMocks
AccountService accountService;
@Tes... | {
"domain": "codereview.stackexchange",
"id": 35872,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "java, spring",
"url": null
} |
ofdm
Then, why is there an aditional need for cyclic prefix? doesn't using sub-carriers enough for dealing with the ISI? OFDM (sub)carriers are only exactly orthogonal over a certain IFFT block length (and integer multiples). Multipath echos will mix a subcarrier signal from the end of one symbol block into the begin... | {
"domain": "dsp.stackexchange",
"id": 5505,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "ofdm",
"url": null
} |
wheeled-robot
Title: How do I determine the heading of a six wheeled robot? I have a robot simulation that simulates Mars Exploration Rover with six steerable wheels.
In case of the following steering configuration
// --- // front wheels
// // middle wheels
// --- // rear wheels | {
"domain": "robotics.stackexchange",
"id": 517,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "wheeled-robot",
"url": null
} |
python, strings, python-3.x, complexity, compression
for idx in range(len(data)):
if compressed_string_size >= len(data):
break
if data[idx] == data[curr_char_pos]:
frequencies[curr_char_pos] += 1
else:
compressed_string.append(data[curr_char_pos])
... | {
"domain": "codereview.stackexchange",
"id": 21999,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python, strings, python-3.x, complexity, compression",
"url": null
} |
problem asks the question "what is the shape of the curve down which a bead sliding from rest and accelerated by gravity will slip,. to the inverse-square brachistochrone problem on circular and annular domains Christopher Grimm and John A. Here is a. The Subterranean Brachistochrone A Brachistochrone is a frictionless... | {
"domain": "mpl-bauen.de",
"id": null,
"lm_label": "1. Yes\n2. Yes",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9867771798031351,
"lm_q1q2_score": 0.8464259861854163,
"lm_q2_score": 0.8577680995361899,
"openwebmath_perplexity": 724.0929084680103,
"openwebmath_score": 0.6773722171783447,
"tags": n... |
machine-learning, keras, time-series, lstm, forecasting
You are trying to predict only one value, that is price, right?
And what is your feature set? is it only date, type and region?
Remember, to predict a value you should always have known feature set. If you have a feature that is not known, then this is not the r... | {
"domain": "datascience.stackexchange",
"id": 5725,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "machine-learning, keras, time-series, lstm, forecasting",
"url": null
} |
dynamixel
Originally posted by jorge with karma: 2284 on 2017-10-23
This answer was ACCEPTED on the original site
Post score: 1 | {
"domain": "robotics.stackexchange",
"id": 29136,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "dynamixel",
"url": null
} |
javascript, css, image, web-scraping, url
str4 = "https://site.com/content/2020/03/"; /* groups 169-171*/
ext = ".jpg"
z = "0";
zz ="00";
if (loop > 0 ) {
x+=loop;
console.log('one loop ' + loop );
if(x >= 9){
var zz = "00".replace('00','0');
}
if(x >= 99){
var zz = "00"... | {
"domain": "codereview.stackexchange",
"id": 38277,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "javascript, css, image, web-scraping, url",
"url": null
} |
ros, boost, image-transport, archlinux, ros-diamondback
The compiler doesn't like line 59 in image_transport/src/publishers.cpp
56 uint32_t getNumSubscribers() const
57 {
58 uint32_t count = 0;
59 BOOST_FOREACH(const PublisherPlugin& pub, publishers_)
60 count += pub.getNumSubscribers();
61 ... | {
"domain": "robotics.stackexchange",
"id": 6452,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "ros, boost, image-transport, archlinux, ros-diamondback",
"url": null
} |
quantum-field-theory, mass, neutrinos, dirac-equation, majorana-fermions
must the parameter $m_{M}$ non-negative and real?
It may have arbitrary sign and, in principle, it can be complex (if we don't have specific interaction terms). The reason is that for Majorana case we don't have $U(1)$ global symmetry, so that b... | {
"domain": "physics.stackexchange",
"id": 28415,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "quantum-field-theory, mass, neutrinos, dirac-equation, majorana-fermions",
"url"... |
scheme, macros, racket
(generate-debug-version match)
(generate-debug-version match*)
The small first macro, clauses->numbers, determines which clause is expanded in racket/match functions
The main macro, generate-debug-version, is what I'm trying to simplify.
This macro currently takes one function name (for exampl... | {
"domain": "codereview.stackexchange",
"id": 22911,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "scheme, macros, racket",
"url": null
} |
quantum-mechanics, homework-and-exercises, operators, commutator, observables
The example given in the problem statement seems to be an exception of this. However, I am not sure where in the proof there is room for an exception. Where am I incorrect, or what am I misunderstanding?
Similar question: Two operators commu... | {
"domain": "physics.stackexchange",
"id": 95982,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "quantum-mechanics, homework-and-exercises, operators, commutator, observables",
... |
ros, gazebo7, ros-kinetic, nvidia
Title: What is the Segmentation fault (core dumped) error?
Hi, I'm using ROS kinetic of Ubuntu 16.04, and the Gazebo version is 7.
My work is related to Deep Reinforcement Learning, and I'm doing it with the Gazebo simulation.
And I've also DONE HAVE NVIDIA Geforce 1080 and graphic d... | {
"domain": "robotics.stackexchange",
"id": 34898,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "ros, gazebo7, ros-kinetic, nvidia",
"url": null
} |
So yeah, you should be able to take it from here.
3. Jul 15, 2009
### complexnumber
snipez90, thanks for your reply.
Continue from your RHS, I get
\begin{align*} |(x-1)(1+2i) + i (y + 1)| =& \left|(1+2i) [(x-1) + \frac{i(y+1)}{1 + 2i}] \right| \\ =& |1+2i| \left| (x-1) + \frac{i(y+1) (1 - 2i)}{(1 + 2i) (1 - 2i)} \r... | {
"domain": "physicsforums.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9736446479186301,
"lm_q1q2_score": 0.8134640723306915,
"lm_q2_score": 0.8354835350552604,
"openwebmath_perplexity": 2174.9689708746373,
"openwebmath_score": 0.9902302026748657,
"ta... |
electromagnetism, mathematical-physics, boundary-conditions, differential-equations, greens-functions
Feel free to correct any of my misinterpretations and mistakes in general. Good questions; I'm sure a lot of people are confused on this stuff (as I was the first time I used Jackson).
Essentially your confusion boils... | {
"domain": "physics.stackexchange",
"id": 6679,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "electromagnetism, mathematical-physics, boundary-conditions, differential-equations... |
acid-base, kinetics
The given answer is B and the reasoning is that is is the most electropositive since it the furthest left and down according to periodic trends.
However, isn't $\ce{K}$ the conjugate acid from a strong base -- $\ce{KOH}$? So isn't the conjugate base of a strong acid quite weak? So why would $\ce{K}... | {
"domain": "chemistry.stackexchange",
"id": 1297,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "acid-base, kinetics",
"url": null
} |
javascript, performance, comparative-review, chess
Title: Determining possible moves in a Chess game I'm making a chess engine that is going to run the function containing this loop many times a second, so I want it to be well optimized.
Which of these two implementations would perform faster?
This:
for(var j = idx-8,... | {
"domain": "codereview.stackexchange",
"id": 21692,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "javascript, performance, comparative-review, chess",
"url": null
} |
graphs, terminology, trees
Perfect Binary Tree: A Binary tree is Perfect Binary Tree in which all internal nodes have two children and all leaves are at same level.
18
/ \
15 30
/ \ / \
40 50 100 40 | {
"domain": "cs.stackexchange",
"id": 9445,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "graphs, terminology, trees",
"url": null
} |
c#, security, asp.net-mvc, ip-address
Title: Code allowed to test mail invitations by users (from another post) on an instance of Visual studio debugging I am currently working on an application in ASP.Net MVC, with a SQL Server 2016 database and Entity Framework 6.
The application can process specific data and genera... | {
"domain": "codereview.stackexchange",
"id": 25847,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c#, security, asp.net-mvc, ip-address",
"url": null
} |
general-relativity, black-holes, mass-energy, event-horizon
So you could make a black hole from a light beam, but this isn't the same as making a black hole from a photon. The trouble is that while it's tempting to think of a photon as a particle like an electron, this is a very poor way to describe light in most circ... | {
"domain": "physics.stackexchange",
"id": 23671,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "general-relativity, black-holes, mass-energy, event-horizon",
"url": null
} |
if the pencil tip is placed at its center of gravity. The median is a line drawn from the midpoint of any one side to the opposite vertex. This is half its diameter. Now, in a full circle because of complete symmetry and area distribution, the moment of inertia relative to the x-axis is the same as the y-axis. So, the ... | {
"domain": "sicituradastra.it",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9830850852465429,
"lm_q1q2_score": 0.8296206869041551,
"lm_q2_score": 0.8438951005915208,
"openwebmath_perplexity": 560.3404868312341,
"openwebmath_score": 0.7373648285865784,
"tag... |
electrostatics, method-of-images
Title: Method of images
we know this classic problem shown.
Where a conducting infinite sheet has a charge q in front of it at distance d.
We know how to solve this using method of images for the region A where the charge q is.
but my doubt is
will the same procedure work for the regi... | {
"domain": "physics.stackexchange",
"id": 90219,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "electrostatics, method-of-images",
"url": null
} |
terminology, game-ai, evaluation-functions
Is "goodness" an actual term in use in this context, or should it more properly be something like "perceived optimality"?
I ask because, for instance, in Combinatorial Game Theory, a lighthearted term such as "loopy" is preferred by some mathematicians (Demaine) over the more... | {
"domain": "ai.stackexchange",
"id": 216,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "terminology, game-ai, evaluation-functions",
"url": null
} |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.