text stringlengths 1 1.11k | source dict |
|---|---|
c#, sorting, enum
https://sourcemaking.com/refactoring/smells/switch-statements
http://c2.com/cgi/wiki?SwitchStatementsSmell
https://stackoverflow.com/questions/4417070/switch-statements-are-bad
Here's what you'd do with your code. First make your class abstract and give it a CompareTo method that calls child clas... | {
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"tags": "c#, sorting, enum",
"url": null
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c#, multithreading, .net, asynchronous, http
Ideally your SearchTerms should return a task as well. Any exceptions from the Request should be handled in within the SearchTerms and it can return just a bool to indicate a success or failure.
Where you are calling SearchTerms (which in itself will be marked as async yo... | {
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"tags": "c#, multithreading, .net, asynchronous, http",
"url": null
} |
ruby, ruby-on-rails
Title: Rails 3 nested controller method I have 2 nested resources in one of my Rails apps and the way the index is handled by the inner resources bothers me somewhat:
def index
@program = Program.approved.find(params[:program_id]) if params[:program_id]
if params[:tags]
tags = params[... | {
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"tags": "ruby, ruby-on-rails",
"url": null
} |
c++, beginner, object-oriented, game, playing-cards
Card* Deck::getCard() {
if(pos >= deckSize) {
shuffle();
pos = 0;
}
return deck[pos++];
}
class Hand {
private:
Deck* deck;
vector<Card*> cards;
int points;
unordered_set<Card*> aces;
public:
... | {
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"tags": "c++, beginner, object-oriented, game, playing-cards",
"url": null
} |
biochemistry, cell-biology, cancer, pathology, mutations
Some diseases with proven somatic mutation are:
Neurofibromatosis 1 & 2
McCune-Albright
Paroxysmal Nocturnal Hemoglobinuria
Incontinentia Pigmenti
For more details, have a look at this paper here.
Erickson RP. Somatic gene mutation and human disease other than... | {
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"tags": "biochemistry, cell-biology, cancer, pathology, mutations",
"url": null
} |
image-processing, matlab
Title: Edge detection and area measurement I am a novice in image processing. As a part of my school project, I have to do the following steps in Matlab on the below image.
Detect the edges of a leaf.
Calculate the area of a leaf (excluding the stem portion)
My friend suggested me an idea ... | {
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"tags": "image-processing, matlab",
"url": null
} |
haskell
solve :: String -> Maybe [(Char, Int)]
solve puzzle = solve' =<< NE.nonEmpty terms
where
terms = filter (all C.isUpper) . words $ puzzle
solves :: [(Char, Int)] -> NonEmpty String -> Bool
solves cmap terms = (sum <$> mapM termToInt (NE.init terms)) == termToInt (NE.last terms)
where
termToInt :: [... | {
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"tags": "haskell",
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For each $B \in \mathcal{B}$, consider the following two items:
$\mathcal{W}_B=\left\{A: A \times B \in \mathcal{U} \right\}$
$W_B=\bigcup \mathcal{W}_B$
To simplify matter, we only consider $B \in \mathcal{B}$ such that $\mathcal{W}_B \ne \varnothing$. Each $W_B$ is open in $X$ and hence by assumption an $F_\sigma$... | {
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9907319885346244,
"lm_q1q2_score": 0.8076769075174758,
"lm_q2_score": 0.8152324915965392,
"openwebmath_perplexity": 2702.333109678335,
"openwebmath_score": 1.0000100135803223,
"tag... |
c#, .net, linq, classes
I am new in programming, could you please help me to improve this code I can see some room for improvement:
Most importantly, you shouldn't hide exceptions like this. You should most likely let the exceptions bubble up and let the called decide what to do when an exception happens. And if you ... | {
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"tags": "c#, .net, linq, classes",
"url": null
} |
c#, object-oriented, validation, generics, inheritance
public ValidationResult(bool success, T value)
{
Success = success;
Value = value;
}
public ValidationResult(bool success) : this(success, default(T))
{
}
}
The InputValidatorUnparsed<TSource, TValue> class which deals with in... | {
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"tags": "c#, object-oriented, validation, generics, inheritance",
"url": null
} |
javascript, jquery, optimization
</head>
<body>
<div id="container">
<div id="nav">
<ul id="mainNav">
<li id="streamInfo"></li>
</ul>
<ul id="chatAnchor">
<li>
<a onclick="$(this).addClass('activeChat');$('#streamChat')... | {
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"tags": "javascript, jquery, optimization",
"url": null
} |
growth and decay. answer choices Q. Extended questions 1. Recall: 12,24,48,96,… 12,6,3,1. Forward Euler method) b. Rules for creative writing workshop creative writing career path computer virus research paper free problem solving software advantages creative writing starter sentences worksheets indoor rock climbing bu... | {
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"id": null,
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9773707993078212,
"lm_q1q2_score": 0.8267994285285051,
"lm_q2_score": 0.8459424295406088,
"openwebmath_perplexity": 803.6310114013545,
"openwebmath_score": 0.5381872057914734,
"tags": ... |
quantum-information, information
The specific numerical factor in the inequality is notable. Not only is the mutual information of two subsystems bounded by some value proportional to the surface area, but it is the same value for a wide variety of cases.
By verifying this bound rigorously, one can also better unders... | {
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"openwebmath_score": null,
"tags": "quantum-information, information",
"url": null
} |
reinforcement-learning, q-learning, dqn, deep-rl, pseudocode
totalReturn+=step();
In your pseudocode you do not return anything from step and it is not clear what you hope to do with this totalReturn variable. Technically it won't equal the definition of return in RL for any state, not even the starting state if gamm... | {
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"tags": "reinforcement-learning, q-learning, dqn, deep-rl, pseudocode",
"url": null
} |
thermodynamics, thermal-radiation, convection
In both of these cases, we are not cooking the turkey via the radiant heat from the (extremely hot) heating element. The heating elements are cycled on and off to maintain the temperature inside the oven, but they spend most of their time off. If we do cook with the radi... | {
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"openwebmath_score": null,
"tags": "thermodynamics, thermal-radiation, convection",
"url": null
} |
electrochemistry, electrolysis, silver, electroplating
Title: Silver electroplating In most of silver electroplating (or electrorefining) methods, it is mentioned that silver anode is oxidized in aqueous solution of silver nitrate, and that silver is deposited at the cathode (regardless of cathode material, let's assu... | {
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"tags": "electrochemistry, electrolysis, silver, electroplating",
"url": null
} |
species-identification, botany
Title: Is this black locust? This grows in Modiin, Israel. The leaves look like black locust (Pseudoacacia robinia) to me, but the branches are very knobby. Can anyone identify it? Although the photos are less than ideal, and I can't see any flowers or fruit, I can clearly see that the l... | {
"domain": "biology.stackexchange",
"id": 8526,
"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, botany",
"url": null
} |
fourier-transform, autocorrelation
12668.63 : * * * * ****** ****
9500.13 : * * * * * ** ****** ... | {
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"openwebmath_score": null,
"tags": "fourier-transform, autocorrelation",
"url": null
} |
fluid-dynamics, surface-tension
Title: Surface tension on a film Why don't the surface tension of the film of soap solution ( or any other liquid) increases or decreases when we increase the area of the film manually by applying a force ??
Isn't it analogous to the increase in tension of the string on stretching it. T... | {
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"tags": "fluid-dynamics, surface-tension",
"url": null
} |
ros, moveit, build
Does anyone know if this is related to changes in Moveit lately? I think my travis.yml is okay because it's pretty much the same as the one for rail_manipulation_msgs. Here's the travis.yml:
{
"sudo": "required",
"dist": "trusty",
"language": "generic",
"env": "CI_ROS_DISTRO=\"indigo\"",
... | {
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"tags": "ros, moveit, build",
"url": null
} |
javascript, beginner, form, dom
var organizeForm = function () {
var rows = tbody.children;
for (var r = 0; r < rows.length; r++) {
while (rows[r].childElementCount > inputOpts.length) {
rows[r].deleteCell(inputOpts.length);
}
var cell = rows[r].insertCell(-1);
var remove = new ... | {
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"tags": "javascript, beginner, form, dom",
"url": null
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ros
Title: Learning ROS - Custom robot
Hi,
I'm new to ROS and trying to learn it, but seem to be missing something to complete my goal.
First of all, i work as software engineer for many years now and spend a lot of my free time in game development.
But i also have a great interest in robots, but never found a way to... | {
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"tags": "ros",
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quantum-mechanics, hilbert-space
Dirac's notation ... because i don't understand Hilbert space i don't understand what i am allowed to do with kets | ⟩ and bras ⟨ | and for example:
Why do we have to write an operator on the left side of kets |A^ψ⟩=A^|ψ⟩ but for bras it is vice versa (we write it on the right) ⟨A^ψ|=⟨... | {
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"tags": "quantum-mechanics, hilbert-space",
"url": null
} |
c#, repository
Use of patterns in code
public CaseNote PutData(int userId, string caseId, long status, CaseNoteType noteType, string note)
{
// Map our objects to CARS objects...
...
// package up the web request...
...
// execute the web request...
CarsWS_CaseNote response = null;
using (v... | {
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"tags": "c#, repository",
"url": null
} |
design-patterns, .net, vb.net, memoization
Public Shared Function Mize(Of TArg1 As Structure, TArg2 As Structure, TArg3 As Structure, TResult)(ByVal input_f As System.Func(Of TArg1, TArg2, TArg3, TResult)) As System.Func(Of TArg1, TArg2, TArg3, TResult)
Dim map = New System.Collections.Generic.Dictionary(Of System... | {
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ros, pcl, approximatetime, message-filters
[5.100s] 280 | ::_3, std::placeholders::_4, std::placeholders::_5, std::placeholders::_6, std::placeholders::_7, std::placeholders::_8, std::placeholders::_9)); | {
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"url": null
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snr, quantization, cosine, thd
22&2097151.15707326&2097151.15707318&-134.215150&-134.21482&-134.213010\\
23&4194303.15703317&4194303.15703313&-140.235446&-140.235212&-140.233932\\
24&8388607.15700481&8388607.15700479&-146.25583&-146.25567&-146.25476\end{array}$$
The equivalence of the two optimality definitions holds ... | {
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"tags": "snr, quantization, cosine, thd",
"url": null
} |
ros-kinetic
Title: Is the tutorial to compile Tiago with ROS Kinetic working?
Hi all,
I've tried to compile Tiago with ROS Kinetic by following the official tutorial wiki.ros.org/Robots/TIAGo/kinetic_install, but I'm having problems.
The error is:
Starting >>> diff_drive_controller | {
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formula. If you want to find the circumcenter of a triangle, First find the slopes and midpoints of the lines of triangle. AB (m) = 8−56−4=32\dfrac{8-5}{6-4} = \dfrac{3}{2}6−48−5=23, BC (m) = −2−83−6=103\dfrac{-2-8}{3-6} = \dfrac{10}{3}3−6−2−8=310, CA (m) = −2−53−4=7\dfrac{-2-5}{3-4} = 73−4−2−5=7. In other words, ... | {
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9748211539104333,
"lm_q1q2_score": 0.8123424496367515,
"lm_q2_score": 0.8333246015211008,
"openwebmath_perplexity": 481.9983013396492,
"openwebmath_score": 0.5764424800872803,
"tags": n... |
inorganic-chemistry, nomenclature, periodic-trends, structural-formula
Title: Why H2S2 is hydrogen disulfide and not hydrogen persulfide? Context: I was checking this question and in the answer, the compound $\ce{FeS2}$ was named "iron disulphide" (it was previously named "iron persulfide" but later changed after resp... | {
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"url"... |
This is merely a definition, and can't be proved via standard algebra. However, two examples of places where it is convenient to assume this:
1) The binomial formula: $(x+y)^n=\sum_{k=0}^n {n\choose k}x^ky^{n-k}$. When you set $y=0$ (or $x=0$) you'll get a term of $0^0$ in the sum, which should be equal to 1 for the f... | {
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"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9407897492587142,
"lm_q1q2_score": 0.8255211713969394,
"lm_q2_score": 0.8774767922879692,
"openwebmath_perplexity": 261.35728347915745,
"openwebmath_score": 0.8884240388870239,
"ta... |
electromagnetism, classical-mechanics, electric-fields, magnetic-fields, classical-electrodynamics
The vector potential due to a magnetic dipole at rest is $A^\mu=(\phi,\textbf{A})$, with $\phi=0$ and $\textbf{A}=\textbf{m}\times\hat{\textbf{r}}/r^2$. Do a Lorentz boost on this vector, and you get a potential $A^{\mu'... | {
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"tags": "electromagnetism, classical-mechanics, electric-fields, magnetic-fields, classical-... |
concurrency, synchronization, mutual-exclusion
Reader's Code
'mutex' variable is used for synchronization among different reader processes. No_of_Readers is a shared variable among reader processes. So, if more than one process is updating this variable then it's very likely that we will end up with wrong value. Thus,... | {
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"tags": "concurrency, synchronization, mutual-exclusion",
"url": null
} |
javascript, beginner, html
I'd probably choose to define the values in a separate JS file and load that in the html. Loading a local JS file with a <script src=... is allowed even with same-origin constraints.
Second, a little more separation in the JS would be nice. For instance, the calculate function which does mor... | {
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"tags": "javascript, beginner, html",
"url": null
} |
c#, performance, stack
There were #region and <summary> tags on everything, but I removed them to post here, since it seemed like it added a lot of visual noise and made the code otherwise harder to read.
The class does not currently implement IEnumerable<T> or IEnumerable, but will.
I don't want to implement ICollect... | {
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"tags": "c#, performance, stack",
"url": null
} |
electromagnetism, magnetic-fields, spring
(p.s. obviously it's not possible to exactly duplicate the repulsion effect, just like it would be impossible to duplicate the repulsion of two magnets, using those same exact two magnets at a later time... I'm just talking about getting 99.999999% duplication for all intents ... | {
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"tags": "electromagnetism, magnetic-fields, spring",
"url": null
} |
programming-languages, language-design, syntax-trees
Title: Visual programming tools, why don’t they work with the AST directly? I've found several open source visual programing tools like Blockly and friends, and other projects hosted at Github, but could't find any that work directly with the abstract syntax tree.
W... | {
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"tags": "programming-languages, language-design, syntax-trees",
"url": null
} |
organic-chemistry, reaction-mechanism, tautomer
A 9 kcal/mol effect due to hydrogen bonding and a 8 kcal/mol push due to resonance, shifts the 17 kcal/mol stabilization of the keto form to something very close to where the keto and enol forms have comparable energy. Therefore, in 1,3-dicarbonyl compounds we would exp... | {
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"openwebmath_score": null,
"tags": "organic-chemistry, reaction-mechanism, tautomer",
"url": null
} |
quantum-mechanics, measurement-problem, observables, wavefunction-collapse
Title: Does every measurement correspond to an eigenstate of an observable? In the postulates of quantum mechanics, physical observables are described by Hermitian matrices on the state space of a system.
In another of my questions, the measure... | {
"domain": "physics.stackexchange",
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"tags": "quantum-mechanics, measurement-problem, observables, wavefunction-collapse",
"url... |
# Convergence of the series $\sum\limits_{n=1}^{\infty}(-1)^{n}\frac{\ln(n)}{\sqrt{n}}$
I would like to see whether or not $$\sum\limits_{n=1}^{\infty}(-1)^{n}\dfrac{\ln(n)}{\sqrt{n}}$$ is a convergent series.
Root test and ratio test are both inconclusive. I tried the alternating series test after altering the form ... | {
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9744347875615795,
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"lm_q2_score": 0.8558511414521923,
"openwebmath_perplexity": 174.35529458347284,
"openwebmath_score": 0.866435706615448,
"tag... |
robotic-arm, industrial-robot
UI Frameworks help you create windows, icons, input fields, labels, etc. all Graphical related thing you see on screen. The first choice here is to decide if you want a web-based UI, displayed only in a browser, a native UI for windows (or should it be cross platform, this way you can avo... | {
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"tags": "robotic-arm, industrial-robot",
"url": null
} |
are also used to establish relationships between two-dimensional and three-dimensional figures ( given ) and AD is to... The lengths of side AB and side CD keep learning!!!!!... Two sides are equal is called an isosceles trapezoid is isosceles if and only if the base angles are.!, stay Safe and keep learning!!!!!!!!!!!... | {
"domain": "anthana.nl",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9740426412951847,
"lm_q1q2_score": 0.809568769630045,
"lm_q2_score": 0.8311430478583168,
"openwebmath_perplexity": 1054.3532733891311,
"openwebmath_score": 0.464902400970459,
"tags": ... |
derivative ( or the second, third, fourth, etc AM Section 4 use of first! / ∂x2 = ∂ ( ∂ [ sin ( log x ) a! ( 1 + 1 ⁄ 3 √6 – 1 ) ≈ 4.89 ⁄ 3 √6 – 1.. A bit and understand what a first derivative again w.r.t ∂x ) / ∂x ) ∂x... 1. f ” ( x ) = sin ( x ) > 0 then. Is given as \ ( \frac { 1 } { x } \ ] ( ). Function can either... | {
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"id": null,
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9799765575409524,
"lm_q1q2_score": 0.8012038250695025,
"lm_q2_score": 0.8175744806385543,
"openwebmath_perplexity": 733.0246068658903,
"openwebmath_score": 0.8495223522186279,
"ta... |
### Edit 2
I have generalized the formulas to weighted statistics. The motivation for this is a recent federal court case in the US involving a dispute over how to pool weighted variances: a government agency contends the proper method is to weight the two group variances equally. In working on this case I found it di... | {
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9766692311915195,
"lm_q1q2_score": 0.8117518395194574,
"lm_q2_score": 0.8311430457670241,
"openwebmath_perplexity": 941.1640481282294,
"openwebmath_score": 0.8888400197029114,
"tag... |
machine-learning, neural-network
Title: How do AI's learn to act when the problem space is too big I learn best through experimentation and example. I'm learning about neural networks and have (what I think) is a pretty good understanding of classification and regression and also supervised and unsupervised learning, ... | {
"domain": "datascience.stackexchange",
"id": 9212,
"lm_label": null,
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"lm_q1_score": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "machine-learning, neural-network",
"url": null
} |
arduino, rosserial
Originally posted by jayson ding on ROS Answers with karma: 29 on 2011-12-28
Post score: 1
Encode the data as either a hex or decimal character string, then parse it on the other end. That is a lot more effort than just sending std_msgs/int16, but seems necessary for multiple commands using the sam... | {
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"openwebmath_score": null,
"tags": "arduino, rosserial",
"url": null
} |
photochemistry
Title: Kinetics energy expression of photon I need to calculate the kinetics energy of a photon and I'm trying to deduce a correct expression for calculating it.
So we have that
$K= \frac{1}{2} m_fv_f^2$
So $v_f= c$
For De Broglie equation we have that $m_f = \frac{h}{\lambda c}$
And then
$K = \frac{... | {
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"id": 5768,
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"openwebmath_score": null,
"tags": "photochemistry",
"url": null
} |
thermodynamics, convection
Almost everywhere that I have looked has given the same simple formula that the rate of heat transfer
$$\frac{\mathrm{d}Q}{\mathrm{d}t} = hA(T_1 - T_2)$$
with $A$ being the surface area in contact, $T_1$ being the temperature of the object and $T_2$ being the ambient fluid temperature. Then ... | {
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"id": 27241,
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "thermodynamics, convection",
"url": null
} |
ros, boost
void callback(const sensor_msgs::ImageConstPtr& image, const imagineer::Number& digit)
{ | {
"domain": "robotics.stackexchange",
"id": 36402,
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"openwebmath_score": null,
"tags": "ros, boost",
"url": null
} |
c++, game, sfml
const sf::Sprite& getFirstDownSprite();
const sf::Sprite& getSecondTopSprite();
const sf::Sprite& getSecondDownSprite();
};
Pipes.cpp
#include "Pipes.h"
Pipes::Pipes(GameDataRef _data) : data(_data)
{
sf::Texture* top_pipe = getGlobalTextureHolder().getResource("top_pipe");
sf::Tex... | {
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"id": 43754,
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"openwebmath_score": null,
"tags": "c++, game, sfml",
"url": null
} |
cosmology
Title: Can we see beyond the Hubble Volume? The wiki article on the Hubble volume says that the Hubble volume is often confused with the limit of the observable universe. This thread: When will the Hubble volume coincide with the volume of the observable Universe? seems somewhat inclusive and is related, but... | {
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"tags": "cosmology",
"url": null
} |
quantum-field-theory, mathematical-physics, regularization, analyticity, casimir-effect
I think that part of your uneasiness is that you don't see a leading infinite term in the analytical continuation method. It turns out that the Casimir force is a bit of an exception in this regard. In your typical QFT calculations... | {
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"id": 99849,
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"openwebmath_score": null,
"tags": "quantum-field-theory, mathematical-physics, regularization, analyticity, casimir-e... |
ros, ros-control, asyncspinner, controller-manager, callbackqueue
Not understanding how the controller manager started and stopped controllers.
Getting the services on the controller manager to work.
The controller manager has no exposed start or stop routine or service. Instead the user has to use switch_controller... | {
"domain": "robotics.stackexchange",
"id": 16686,
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"tags": "ros, ros-control, asyncspinner, controller-manager, callbackqueue",
"url": null... |
programming-languages, functional-programming, mathematical-programming
proc get_transform_list(bit_list, desired_bit_list):
transform_list = []
current_bit_list = bit_list
for i in len(bit_list)^2:
affected_indices = get_list_of_one_indices_from_number(i) // returns list of 'on' indices in binary ... | {
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"id": 11141,
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"lm_q1q2_score": null,
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"openwebmath_score": null,
"tags": "programming-languages, functional-programming, mathematical-programming",
"url": null... |
c++, object-oriented, game, playing-cards, sfml
There are 2 aspects of this class that I don't like.
The Cards in the cardIdentifiers container must have a strict ordering that matches the one in the Textures folder (see it on GitHub). If one changes any card's place in that container, the textures won't be correspon... | {
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"openwebmath_score": null,
"tags": "c++, object-oriented, game, playing-cards, sfml",
"url": null
} |
To Order Antabuse[/url] Se Vende Viagra Madrid Is Reconstituted Amoxicillin Still Good [url=http://viag1.xyz/viagra-pills.php]Viagra Pills[/url] Amoxicillin 500 Mg Diarrhea Wirkung Viagra Frau [url=http://cial5mg.xyz/buy-tadalafil-online.php]Buy Tadalafil Online[/url] Secure Generic Stendra Cod Only Worldwide Mastercar... | {
"domain": "techiemathteacher.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9946981049734268,
"lm_q1q2_score": 0.801360809364262,
"lm_q2_score": 0.8056321866478978,
"openwebmath_perplexity": 7366.941669735154,
"openwebmath_score": 0.17075008153915405,
... |
• Update $A_2 := A_2 - q_1 r_{12}^T \text{.}$
This substracts the component of each column that is in the direction of $q_1 \text{.}$
• Continue the process with the updated matrix $A_2 \text{.}$
The complete algorithm, which overwrites $A$ with $Q \text{,}$ is given in Figure 4.5.1.2. Observe that the elements on t... | {
"domain": "utexas.edu",
"id": null,
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9865717440735736,
"lm_q1q2_score": 0.8111485601589559,
"lm_q2_score": 0.8221891261650247,
"openwebmath_perplexity": 656.5359967767334,
"openwebmath_score": 1.000004529953003,
"tags": null... |
as in the bisection algorithm, the initial two guesses must be such that one gives a positive function evaluation and the. The root is then approximately equal to any value in the final (very small) interval. At least one root exists between the two points if the function is real, continuous, and changes sign. 3 Newton... | {
"domain": "ac-immacolata.it",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9843363499098283,
"lm_q1q2_score": 0.8516715152979666,
"lm_q2_score": 0.8652240825770432,
"openwebmath_perplexity": 622.7896160604779,
"openwebmath_score": 0.4754257798194885,
"tags... |
input series. The signals are harmonics of each other. Just wanted to start a discussion about whether anyone here has had success using Fourier Transforms and Fourier Series, or even just ideas that they've been thinking about trying themselves. So sinω0t, sin2ω0t forms an orthogonal set. Although the function is a co... | {
"domain": "peterjackson.it",
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"lm_q1_score": 0.9886682454669814,
"lm_q1q2_score": 0.8281282595168402,
"lm_q2_score": 0.8376199633332891,
"openwebmath_perplexity": 497.33143749852866,
"openwebmath_score": 0.9017105102539062,
"tags... |
What the two equalities $f(x+y)=f(x)+f(y)$ and $f(1)=1$ imply is that $f(x)=x$ whenever $x$ is rational. Let's see that first for positive rational numbers.
\begin{align} 1 =f(1) & = f\left(\frac15+\frac15+\frac15+\frac15+\frac15\right) \\[10pt] & = f\left(\frac15\right) + f\left(\frac15\right) + f\left(\frac15\right)... | {
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"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9585377261041521,
"lm_q1q2_score": 0.8240201417974489,
"lm_q2_score": 0.8596637559030338,
"openwebmath_perplexity": 211.35590073258584,
"openwebmath_score": 0.9687228798866272,
"ta... |
quantum-field-theory, conformal-field-theory, correlation-functions, regularization
Title: $i\epsilon$ in CFT correlation functions M. Luescher in his talk on p.6 writes that the 2-point correlation function of a Hermitian local field $O_k$ of scaling dimension $d=3-k$ looks like
$$
\langle 0| O_k(x) O_k(y) |0\rangle... | {
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"tags": "quantum-field-theory, conformal-field-theory, correlation-functions, regularizatio... |
Ad: I have asked if this property is Morita invariant in MO 124856.
-
How about calling these things balanced commutative rings?
Recall that a category satisfying "monic + epic --> isomorphism" is said to be balanced. Therefore:
1. a monoid is balanced iff every element that is both left-cancellative and right-canc... | {
"domain": "mathoverflow.net",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9802808750611336,
"lm_q1q2_score": 0.83707434251156,
"lm_q2_score": 0.8539127548105611,
"openwebmath_perplexity": 251.61371438695124,
"openwebmath_score": 0.8568684458732605,
"t... |
python, object-oriented, python-3.x, gui, tkinter
However, as Tkinter does not have a EntryBox() class, it would be better to rename this, in order not to confuse the reader of your code, to rename it to something like: CustomEntry() or, why not, CustomEntryWidget(). | {
"domain": "codereview.stackexchange",
"id": 27866,
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"tags": "python, object-oriented, python-3.x, gui, tkinter",
"url": null
} |
first four natural numbers can be written as
$\sum_{k=1}^{4}{k^2}= 1 + 2^2+3^2 +4^2 = 30,$
where $k=1$ in the subscript and 4 in the superscript denote that the summation
index $k$ takes integer values from 1 to 4. | {
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"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9230391579526934,
"lm_q1q2_score": 0.8350278651949234,
"lm_q2_score": 0.9046505318875316,
"openwebmath_perplexity": 892.22569184927,
"openwebmath_score": 0.9732152819633484,
"tags"... |
python, complexity, math-expression-eval
elif((newOpr == "+" or newOpr == "-") and opr not in ["+","-"]):
subs = exeOpr(float(cacheNum), opr, float(newNumber))
del new_expr[pos-2]
del new_expr[pos-2]
new_expr[pos-2] = str(subs)
cacheNum=str(subs)
... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python, complexity, math-expression-eval",
"url": null
} |
python, python-3.x, matrix
def rotate_90degrees_clockwise(di, dj):
"""Rotates a direction vector (di,dj) clockwise, i.e.:
RIGHT(0,1) -> DOWN(1,0) -> LEFT(0,-1) -> UP(-1,0)
"""
return dj, -di
def spiral_direction_steps(n):
"""Create a list of numbers of steps to go sequentially to the right,
... | {
"domain": "codereview.stackexchange",
"id": 37511,
"lm_label": null,
"lm_name": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python, python-3.x, matrix",
"url": null
} |
`````` for(auto it : bc_u){
if(boption("myVerbose") && Environment::isMasterRank() )
std::cout << "[BC] - Applying " << it.second << " on " << it.first << std::endl;
a+=on(_range=markedfaces(mesh,it.first), _rhs=l, _element=u, _expr=it.second );
}``````
##### Code
`````` for(auto it : materials)
{
auto mat = material... | {
"domain": "feelpp.org",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9559813538993888,
"lm_q1q2_score": 0.8163246661246598,
"lm_q2_score": 0.8539127492339909,
"openwebmath_perplexity": 13718.21862802429,
"openwebmath_score": 0.26109886169433594,
"tags": nu... |
rust, tcp, redis
let data_storage = Arc::new(Mutex::new(collections::HashMap::<
String,
(Option<time::Instant>, Vec<u8>),
>::new()));
for stream in listener.incoming() {
match stream {
Ok(s) => {
let cloned_storage = data_storage.clone();
thr... | {
"domain": "codereview.stackexchange",
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "rust, tcp, redis",
"url": null
} |
graph defined by V = {a,b,c,d,e} and E = {{a,c},{6,d}, {b,e},{c,d), {d,e}} ii. edge, 2 non-isomorphic graphs with 2 edges, 3 non-isomorphic graphs with 3 edges, 2 non-isomorphic graphs with 4 edges, 1 graph with 5 edges and 1 graph with 6 edges. The sequence of number of non-isomorphic graphs on n vertices for n = 1,4,... | {
"domain": "bahaiweddings.com",
"id": null,
"lm_label": "1. Yes\n2. Yes\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9615338057771059,
"lm_q1q2_score": 0.8301802155443084,
"lm_q2_score": 0.8633916047011594,
"openwebmath_perplexity": 704.4373446039751,
"openwebmath_score": 0.4816943109035492,
... |
visible-light, wavelength
Is there a way to do this? Human eye has three types of color receptors which respond differently to different parts of the spectrum. See this chart.
One way to tackle your challenge is to basically simulate what the eye does: you take the spectrum as input, calculate how much it would excite... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "visible-light, wavelength",
"url": null
} |
volcanology, earthquakes, history-of-science, ocean-ridge
Title: Why did it take so long to discover the volcanic nature of mid-oceanic ridges? I just read this article and was astonished to see the following:
Oceanographers stumbled on [the mid-oceanic ridges'] volcanic nature in 1973.
What I find surprising is how... | {
"domain": "earthscience.stackexchange",
"id": 1009,
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"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "volcanology, earthquakes, history-of-science, ocean-ridge",
"url": null
} |
After rolling the die once, there is equal probability for each result modulo 6. Adding any unrelated integer to it will preserve the equidistribution. So you can even roll a 20-sided die afterwards and add its outcome: the total sum will still have a probability of 1/6 to be divisible by 6.
• @Kevin The d20 by itself... | {
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"ta... |
python, nlp, pandas, topic-model, lda
Each row (representing a document) has an index column, an id column, and 40 more columns that represent the 20 topics present.
The shape I'm trying to get is one where each topic number is it's own column and rows contain just the index, id, and topic proportions, e.g.:
i id ... | {
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"tags": "python, nlp, pandas, topic-model, lda",
"url": null
} |
1. Ratio problem
In an area of the city the ratio of private homes to apartment is 3:5. If all the apartments are brick made and 1/10 of the private homes are wooden, what is the maximum portion of houses that may be brick?
How to solve this ratio problem?
2. Your ratio gives 3 private homes for every 8 (=3+5) house... | {
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"openwebmath_score": 0.4589003026485443,
... |
As the values of $x$ get larger in absolute value, the graph approaches the $x$-axis. However, because $\dfrac{1}{x}$ never equals zero for any $x$-value, the graph never actually touches the $x$-axis. We say that the $x$-axis is a horizontal asymptote for the graph.
Repeat step (3) for the graph of $g(x)\text{.}$
Ne... | {
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"lm_q1q2_score": 0.8463386221005705,
"lm_q2_score": 0.8519527963298946,
"openwebmath_perplexity": 420.7700164678617,
"openwebmath_score": 0.7928138375282288,
"ta... |
terminology, definitions, measurement
Title: What is an on-line measurement? What is an off-line measurement? See it used here: http://en.wikipedia.org/wiki/Fed-batch. In the table giving the different strategies to control growth in a fed-batch culture, one finds, for example: "on-line measurement of glucose". What d... | {
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"openwebmath_score": null,
"tags": "terminology, definitions, measurement",
"url": null
} |
1.1k views
$F$ is an $n\times n$ real matrix. $b$ is an $n\times 1$ real vector. Suppose there are two $n\times 1$ vectors, $u$ and $v$ such that, $u ≠ v$ and $Fu = b, Fv = b$. Which one of the following statements is false?
1. Determinant of $F$ is zero.
2. There are an infinite number of solutions to $Fx = b$... | {
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"openwebmath_score": 0.9376698732376099,
"tags"... |
haskell, forth
eval :: Exp -> Eval
eval (Cmt _) = return ()
eval (Dump) = do
ns <- dumpStack
liftIO $ print ns
eval (Num n) = pushStack n
eval (Plus) = do
a <- popStack
b <- popStack
pushStack (b+a)
eval (Min) = do
a <- popStack
b <- popStack
pushStack (b-a)
eval (Mul) = do
a <- pop... | {
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"openwebmath_score": null,
"tags": "haskell, forth",
"url": null
} |
c#, multithreading, thread-safety, timer
#region Delegates
/// <summary>A delegate provided by the user of this class which returns the current state,
/// to be tested against a certain condition in the IsConditionMet delegate.</summary>
public delegate T RequestState();
public RequestS... | {
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# Calculate the sum of the infinite series $\sum_{n=0}^{\infty} \frac{n}{4^n}$
A previous problem had us solving $\sum_{n=0}^{\infty} \frac{1}{4^n}$ which I calculated to be $\frac{4}{3}$ using a bit of mathematical manipulation.
Wonderful. Thank you for all the prompt responses. Could anyone suggest an alternate tec... | {
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"openwebmath_score": 0.9906359910964966,
"tag... |
quantum-field-theory, lagrangian-formalism, conformal-field-theory, stress-energy-momentum-tensor, integrable-systems
From periodicity of the cylinder the generator of translation must satisfy
$$\exp\left(\frac{i}{\hbar}\ell \hat{P}_{(\alpha)}(\ell)\right)~=~\hat{\bf 1}\qquad\Rightarrow\qquad {\rm Spec}(\hat{P}_{(\alp... | {
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"id": 95458,
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"tags": "quantum-field-theory, lagrangian-formalism, conformal-field-theory, stress-energy-... |
c#, networking, floating-point, unity3d, raknet
Vice-versa (same test conditions):
BitConverter.GetBytes(): 28 milliseconds
Conversion using union style struct: 15 milliseconds
Conversion using unsafe pointer conversion: 9 milliseconds | {
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javascript, array
One other point to note is, for my application i need the total number of 1s in the BitArray (population count) which is the popcount property in below code. Thanks to the blazingly fast Hamming Weight algorithm BitArray is like 80 times faster compared to counting the existing items in array though ... | {
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"tags": "javascript, array",
"url": null
} |
everyday-life, interference, wavelength, radio
Title: Can a radio station's wavelength be measured by driving through its interference? The other night, while driving I was listening to KGO radio. KGO is a San Francisco AM station that broadcasts at 810khz. I was driving north, away from the station, at about 70mph. I... | {
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"tags": "everyday-life, interference, wavelength, radio",
"url": null
} |
gravity, dark-matter, mass, planet
Large scales
On the scale of galaxies, however, various relaxation mechanisms allows dark matter to form structure. This is the reason that in pure N-body simulations of the Universe, such as the Millennium Simulation, you will see galaxies. The sizes of these structures depend on th... | {
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"tags": "gravity, dark-matter, mass, planet",
"url": null
} |
impulse-response
for the exact response (small-signal analysis). So, the input
is low-level but by a miracle of modern mathematics, we are
able to compute the response of the linearized version
of the nonlinear system to an impulse without using a large
signal that will blow fuses and drive the system into saturation,... | {
"domain": "dsp.stackexchange",
"id": 630,
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"openwebmath_score": null,
"tags": "impulse-response",
"url": null
} |
homework-and-exercises, statistical-mechanics, entropy
Title: Maximizing entropy with Lagrange multipliers This is a problem I saw in a stat mech textbook, and I think it is a fairly common problem.
Given the entropy function: $$S = - \sum_{i=1}^N p_i \log p_i$$
Maximize $S$ subject to constraints:
$$ \sum_{i=1}^N p_i... | {
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"tags": "homework-and-exercises, statistical-mechanics, entropy",
"url": null
} |
probability Measures, John &! Oxford Studies in probability probability of a sequence that converges almost surely implies convergence probability! Takes place on all sets E2F does not converge almost surely implies convergence from MTH at! Hence X n âp µ suï¬cient form the space which Lafuerza-Guill é and! Since th... | {
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"lm_q1_score": 0.9615338057771058,
"lm_q1q2_score": 0.8354063281477462,
"lm_q2_score": 0.8688267881258485,
"openwebmath_perplexity": 601.656100288283,
"openwebmath_score": 0.9190282225608826,... |
observational-astronomy, space, big-bang-theory, movement
of origin! It is a misconception that the universe started as a single point within space. Indeed, measurements since the 1990s seem to show that the universe is infinite in size, which means that the very early universe must have also been infinite. | {
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"tags": "observational-astronomy, space, big-bang-theory, movement",
"url": null
} |
with matrices. addition (+), matrix multiplication (. Solve the matrix equation: A · X + 2 · B = 3 · C. mw]IfA is a matrix, v a vector, and λ a number (i. Binary Multiplication Rules. Cross Product The second type of vector multiplication is called thecross product. type in word problem and solve. UNIT 9: Matrices. Mat... | {
"domain": "delleparoleguerriere.it",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9890130583409235,
"lm_q1q2_score": 0.8198313101749608,
"lm_q2_score": 0.8289388125473629,
"openwebmath_perplexity": 668.8630721038613,
"openwebmath_score": 0.78479182720184... |
ros, libopencv
Then, in the same directory above opencv-4.2.0 (for the purposes of these instructions), get the source of the opencv debian package,
apt-get source libopencv-dev | {
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"tags": "ros, libopencv",
"url": null
} |
ros, roslaunch, ros-kinetic, rospy, node
Originally posted by machinekoder on ROS Answers with karma: 69 on 2018-07-19
Post score: 1
Original comments
Comment by machinekoder on 2018-07-19:
I found the culprit: https://github.com/strawlab/ros_comm/blob/master/clients/rospy/src/rospy/client.py#L223
Looks like the name... | {
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"tags": "ros, roslaunch, ros-kinetic, rospy, node",
"url": null
} |
genetics
Translocation trisomy 21. In this type of chromosomal change, only part of an extra copy of chromosome 21 is in the cells. The extra part of the chromosome gets "stuck" to another chromosome and gets transmitted into other cells as the cells divide. This type of change causes about 4% of Down syndrome cases. ... | {
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"openwebmath_score": null,
"tags": "genetics",
"url": null
} |
c++, linked-list, c++17
iterator erase_after(const_iterator first, const_iterator last) {
// get prev to last node
assert(first.m_ptr);
if (first == last) {
return last.m_ptr;
}
node_base* first_node = first.m_ptr;
node_base* prev_to_last_node = get_prev_to_l... | {
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"tags": "c++, linked-list, c++17",
"url": null
} |
We can rearrange and construct the solution bottom up or we can memoise (remember previous values), both are shown below.
# Table based algorithm.
def W_tab(e, f):
# (e + 1) x (f + 1) array to store results.
# Initialise each entry to +inf.
W = []
for i in range(e + 1):
W.append([float("inf")]*(f + 1))
# For all e. W... | {
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"id": null,
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"lm_q1q2_score": 0.821779062607211,
"lm_q2_score": 0.8354835289107307,
"openwebmath_perplexity": 2135.189792810726,
"openwebmath_score": 0.5631657242774963,
"tags": ... |
error-correction, information-theory, decoherence, error-mitigation
Title: Erasure errors in quantum error correction Consider an $[n, k, d]$ classical code. This code can correct up to $d-1$ erasures. For example, if we have the code that maps $0\rightarrow 00$ and $1\rightarrow 11$, this code has distance $2$. Indee... | {
"domain": "quantumcomputing.stackexchange",
"id": 5348,
"lm_label": null,
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"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "error-correction, information-theory, decoherence, error-mitigation",
"u... |
turing-machines, undecidability, decision-problem, semi-decidability
c) By the definition of semi-decidable, a.k.a Turing-recognizable, $L(M)$ is semi-decidable for any $M$. Hence $\{ \langle M \rangle \mid L(M)$$\text{ is semi-decidable}\}$ contains all TM descriptions, which is a decidable language.
d) $P=\{\langle ... | {
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"openwebmath_score": null,
"tags": "turing-machines, undecidability, decision-problem, semi-decidability",
"url": null
} |
javascript, css, angular.js, controller
Title: Developing an alert notification in AngularJS I'm studying Angular and want to develop my own notification alert. This is what I done, I like it and it's working like a charm but I think that it can be improved:
Do I need to use it in conduction with a service? If yes, h... | {
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"openwebmath_score": null,
"tags": "javascript, css, angular.js, controller",
"url": null
} |
kinect
Title: Robotics with Kinect I want to learn robotics and really interested in making a robot based on Kinect sensor.
I see so many projects like this one, and just wondering how it works on top level. I downloaded Kinect SDK and did some basic tutorials, but I just don't think that Microsoft SDK is the library ... | {
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"id": 1183,
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"lm_q2_score": null,
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"tags": "kinect",
"url": null
} |
java, homework, swing, sqlite, jdbc
showAllSurname();
This should be
showAllSurnames();
Not terribly important, but pedants like me will notice things like that.
Remove redundancy
int choice = 0;
do {
choice = showMenu();
if (choice != 0) {
... | {
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"tags": "java, homework, swing, sqlite, jdbc",
"url": null
} |
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