text stringlengths 1 1.11k | source dict |
|---|---|
3D graphical approach has been adopted to provide the intuition required to OWN this subject. The unit pulse function can be defined with the help of the Heaviside unit step function ( ) ( ) ( ) 0 x a f t Ht a Ht a 1 x a 0 x a <− = +− −= < > a0 > The Fourier transform of this function can be determined as. of a second ... | {
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Select Page | {
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"tags": ... |
approximation-algorithms, multicommodity-flow
If this bottleneck edge $e$ is a forward edge of $P_1$, why do both $P^*_1$ and $P^*_2$ contain this edge?
What is meant by a $D/k$ integral $s$-$t$ flow?
the last question is about approximation algorithms. So far I have never been in touch with approximation algorithms. ... | {
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# Probability of Pairings in Chess Game
1. Nov 18, 2007
### e(ho0n3
[SOLVED] Probability of Pairings in Chess Game
1. The problem statement, all variables and given/known data
The chess clubs of two schools consist of, respectively, 8 and 9 players. Four members from each club are randomly chosen to participate in ... | {
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gazebo, rviz, blender, collada, openrave
The main problem that I couldn't solve is about collisions. My rigid bodies didn't collide when connected through an armature/constraints, even if the collision option is set. I'll be glad to pass you some experimental blend files. | {
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"url": null
} |
forces, newtonian-gravity, acceleration, units, dimensional-analysis
If you think of a very thin bar, it is a line with linear density $d=\frac{Kg}{m}$.
So,
$\frac{N m^2}{(Kg)^2}= \frac{N}{d^2}$
So the units of the gravitational constant can be turned into units of force per squared linear density. This may or may not... | {
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"url": nu... |
sql, hiveql
concat(m2.e_id,',',m2.e_name,',',m2.e_add) as month2s
from month1 as m1
full outer join
month2 as m2
on m1.e_id = m2.e_id
)
select
case when cdc_codes ='Updates'
Then month2s
when cdc_codes = 'NoChange' then month1s
when cdc_codes = 'New' then mont... | {
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photography
If you want to learn more check this very helpful paper, which has some tutorials as well:
http://www.stsci.edu/stsci/resources/imaging/papers/rector2007/files/Rector2005.pdf
Btw, as a curiosity - images from rovers on Mars are mainly black and white and are colorized later (thats why the rovers usually ha... | {
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centripetal-force
True, but not helpful. The mass of a point is also zero, so of course the net force on it is zero.
Instead, if your element has mass $dm$, you must also acknowledge that it is curved a bit and subtends an angle of $d\theta = 2\pi \frac{dm}{M}$, with $M$ the mass of the entire ring.
The two tension fo... | {
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astronomy, calculus
I tried to solve this analytically, but looking at complex trigonometric function that include the earth rotating around its tilted axis around sun lead to nowhere.
However, I noticed that when looking at mountains / high buildings, the overall day length becomes longer, thus this question is meant... | {
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"tags": "astronomy, calculus",
"url": null
} |
electromagnetism, magnetic-fields
Title: If a large magnet is traveling through space and it is suddenly shielded at it's source what happens to the part of the field already past the source? I know that whenever a field forms it travels to area it travels at the speed of light, but once it's already there, what would... | {
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"tags": "electromagnetism, magnetic-fields",
"url": null
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c++, linked-list
// The Insert After Nth Node Function.
template <class DataType>
int dList<DataType>::insertAfterNth(DataType itemToInsert, int afterNth)
{
Node *newNode = new Node;
newNode->data = itemToInsert;
Node *temp1 = head;
int counter = 1;
while (temp1 != nullptr)
{
if (counter == afterNth) b... | {
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perl, graph
There are still some bits I'm not clear about in your code. Specifically, I'm not sure about the roles (or sources) of the functions:
clearerr
gref
seterr
Because of that, I can't test my hypothesis. However, I do think that this solution scales to 200 items more easily than the original - and without ... | {
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thermodynamics, entropy, reversibility
Before: $$\begin{align}S&=-k_b\sum_i p_i \ln(p_i)\\&=-k_b\times 1\times \ln(1)\\&=0\end{align}$$
After: $$\begin{align}S &= -k_b\sum_i p_i \ln(p_i)\\ &=-k_b(0.5\ln(0.5) + 0.5\ln(0.5))\\ &=-k_b\times (-0.7)\\&=0.7k_b>0\end{align}$$
Now, consider reversibility. It means that after ... | {
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digital-communications, orthogonal-signals, sinc
Title: How to prove a train of sinc pulses in digital communicaton system are orthogonal to each other? Consider a train of sinc pulses:
$$\phi_n(t)= \frac{\sin(\omega_M(t-nT_s))}{\omega_M(t-nT_s)}\quad; n=0,\pm1,\pm2,\dots$$
$\quad$where,$\quad T_s=\frac{\pi}{\omega_M}... | {
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java, performance, mathematics, integer, lombok
What does multiplying x01 * y01 produce? The full 128-bit result in terms of the partial products listed above would be:
x01 * y01 = p00 + p01<<32 + p10<<32 + p11<<64
But since the result is only 64 bits, the actual 64-bit result would be:
x01 * y01 = p00 + L(p01)<<32 ... | {
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algorithms, recurrence-relation
Title: Can there exist a recurrence relation for "sequential search"? I'm just confused, cause from my knowledge recurrence is applied mostly to recursive procedures or divide and conquer techniques etc. Sure.
The cost of searching a list of length zero is zero; the worst-case cost of s... | {
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ros, rqt-reconfigure, ros-kinetic, dynamic-reconfigure
[ERROR] [1527081248.063225]
[/dynamic_tutorials]: Error processing
request: 'list' object has no
attribute 'items' ['Traceback (most
recent call last):\n', ' File
"/opt/ros/kinetic/lib/python2.7/dist-packages/rospy/impl/tcpros_service.py",line
625, in _handle_req... | {
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"tags": "ros, rqt-reconfigure, ros-kinetic, dynamic-reconfigure",
"url": null
} |
entomology
Title: How far do 2 ant colonies of same heritage have to be in space (and generation) in order to fight? (Kinda follow-up to this.…)
I've heard before that if you put 2 ant colonies side by side they're going to attack each other.
But then from the previous question, there could be "sister" ant colonies wh... | {
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"tags": "entomology",
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zoology, entomology, arthropod
Title: What is this arthropod? (found in Lapland - Finland) I found this arthropod climbing the wall of my room in Lapland, Finland.
(the max width is about 0.5 cm)
What is it? Is it dangerous? The picture is not great but I'd assume a pseudoscorpion of some sort. Here is one common spe... | {
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navigation, simulation, rviz, stage, stageros
Originally posted by JSantos on ROS Answers with karma: 55 on 2012-12-06
Post score: 2
hector_mapping doesn't use odometry data. That's very nice if you have a real world system that provides no or very bad odometry. If you have perfect odometry in stage on the other hand... | {
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ros
Originally posted by sai with karma: 1935 on 2014-03-27
This answer was ACCEPTED on the original site
Post score: 0 | {
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eigenvalue
Title: Unit for expressing energy eigenvalue in infinite potential well problem How are the energy eigenvalues expressed in a infinite potential well problem( Joules/eV)? Physics should not depend on the system of units you choose to solve any problem, otherwise physics would in Europe will be different tha... | {
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quantum-mechanics, quantum-spin
If you were trying to solve the problem for $j=1$ and $j_z=\pm 1$, you would fail to find a solution again. In that case, the problem would become totally equivalent to the combing of the sphere - because you would be looking for tangential vectors to the sphere's surface - but it is im... | {
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$$a_n=\frac{x_0+2x_1}{3}+\frac{(2x_0-2x_1)(-1)^{n}}{3\cdot 2^n}\tag{6}$$ and thus $$\lim_{n\to \infty }a_n = \color{blue}{\frac{x_0+2x_1}{3}.}\tag{7}$$
Here is a formal derivation of your result. The sequence you have found is a generalization of the Fibonacci sequence.
There have been many extensions of the sequence... | {
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"tag... |
ecology, terminology
Title: Does gross production (P) and biomass (B) mean the same? From fundamentals of ecology, Odum 2005:
... autogenic succession usually begins with an unbalanced community metabolism, where gross production, P, is either greater than or less than community respiration, R, and proceeds towards a... | {
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cc.complexity-theory
http://arxiv.org/abs/1602.00023
Optimal Prefix Free Codes With Partial Sorting
Jérémy Barbay
(Submitted on 29 Jan 2016)
We describe an algorithm computing an optimal prefix free code for n unsorted positive weights in time within O(n(1+lgα))⊆O(nlgn), where the alternation α∈[1..n−1] measures the a... | {
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chip-seq
H3K27ac, H3K4me1 and H3K4me3 are narrow. H3K27me3 is broad.
Yeah, but you'll need to spend a bit more time with the data to ensure that the peaks are reasonable (you'll have to tweak the parameters if not). | {
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f(c) < /(.<•).
We consider the case x < c.
I
u I
u
I
X
I
u
X
Cl
u
X
Cl
c 2
Figure 12.5: Number lines for the argument to Theorem 12.2.3.
By the Mean Value Theorem, there is a number, c\ between x and c for which f(c) – /(*)
c — X
/'(ci) so that /(c) – /(x) = /'(ci)(c – x)
(12.4)
See the third number... | {
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"tags"... |
javascript, php, jquery, ajax, iteration
In that code Array.indexOf() is used but one could also use Array.contains() though it isn't supported by as many (mostly older) browsers (e.g. IE).
Then to get the equivalent of ucwords(), a solution like from this answer can be used:
var properCaseOption = targetId.replace(/\... | {
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graph-theory, co.combinatorics, graph-classes
What is wrong?
Screenshot:
Answering vb le question about polynomial IDS on line.
Clicking details recursively, we get: Polynomial on claw-free
and the claim without reference on claw-free:
Polynomial On domination perfect graphs, the Independent set and Independent do... | {
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quantum-mechanics, quantum-entanglement
Being pure is the same as having your state be represented by a vector in your Hilbert Space. So an entangled state is just as pure as a factorizable state or any other vector in your Hilbert Space. Mixed states involve taking linear combinations of density matrixes of pure stat... | {
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quantum-mechanics, path-integral, perturbation-theory
& {\int{\prod_{1}^{j_1-1}\,dq_j\exp\bigg\{\frac{i\tau}{\hbar}\sum_{j=1}^{j_1-1}\bigg[\frac{m}{2}\bigg(\frac{q_{j+1}-q_j}{\tau}\bigg)^2\bigg]\bigg\}}}
\end{align}
This is just
$$\bigg(\frac{-i}{\hbar}\bigg)^2\int^{t_f}_{t_i}\,dt_2\int_{t_i}^{t_2}\,dt_1\int_{-\infty}... | {
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array, vba
The first things I hit had to do with VBA's Array. The code smell of the imperative solutions I found on StackOverflow and the web, in general, was very frustrating. Additionally, it seemed all the proposed solutions I found were not only not DRY (Don't Repeat Yourself) whatsoever, almost all of them seemed... | {
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php, mysql, security
$SetPasswordAndSalt = $this->dbCon->prepare('UPDATE `customer` SET `hashPass` = :HashPass,`salt` = :Salt WHERE `id` = :CustomerId;');
$SetPasswordAndSalt -> bindValue(':CustomerId',$CustomerId);
$SetPasswordAndSalt -> bindValue(':Salt',$Salt);
$SetPasswordAndSalt -> bindValue(':HashPas... | {
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GMAT Question of the Day: Daily via email | Daily via Instagram New to GMAT Club? Watch this Video
It is currently 03 Jul 2020, 21:04
### GMAT Club Daily Prep
#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Pr... | {
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"lm_q1q2_score": 0.826424728732865,
"lm_q2_score": 0.9032942119105695,
"openwebmath_perplexity": 6210.300645761789,
"openwebmath_score": 0.8435570597648621,
"tags": nu... |
ros, include, ros-kinetic, xacro
Which makes sense, because it seems to try expanding the astra macro completely.
Now if I remove the line
<xacro:orbbec_astra parent="five_inch_chasis" x="0.15" y="0.0" side="1.0"/>
from the top-level file and instead try to pass parameters to the include such as like:
<xacro:include ... | {
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"tags": "ros, include, ros-kinetic, xacro",
"url": null
} |
special-relativity, metric-tensor, coordinate-systems, complex-numbers, wick-rotation
One way to think about a Wick rotation is that the "Euclidean" and "Lorentzian" manifolds (both of which are four-dimensional real manifolds, with a particular metric) can be viewed as hypersurfaces lying in an underlying four-dimens... | {
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"openwebmath_score": null,
"tags": "special-relativity, metric-tensor, coordinate-systems, complex-numbers, wick-rotat... |
general-relativity, differential-geometry, metric-tensor, curvature, singularities
An alternative perspective on local flatness involves understanding the behavior of geodesics near the point of interest. In highly symmetric cases, null geodesics can provide way to investigate points where metric components appear to ... | {
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"tags": "general-relativity, differential-geometry, metric-tensor, curvature, singularities... |
c#, .net, web-services
case HttpStatusCode.Unauthorized:
return new UnauthorizedAccessException("The serial number for this application was invalid.");
case HttpStatusCode.ServiceUnavailable:
return new AppDomainUnloadedException("The web service is currently unavailable.");... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c#, .net, web-services",
"url": null
} |
c++, hangman
std::string HangmanGame::getRandomWord()
{
std::vector<std::string> words;
std::ifstream file("words.txt");
std::string line;
srand(time(0));
while(getline(file,line)) words.push_back(line);
std::random_shuffle(words.begin(), words.end());
return words[0];
}
char HangmanGame:... | {
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"tags": "c++, hangman",
"url": null
} |
ros, array
Original comments
Comment by jayess on 2017-10-29:
We're all here to help so no need for the "plz help"
Comment by gvdhoorn on 2017-10-29:
Make sure you're not using the same serial port for ROS and for Serial.println(..)). That will not work.
Also: make sure you have a large enough buffer on the Arduino si... | {
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"tags": "ros, array",
"url": null
} |
biochemistry, proteins, purification, chromatography
I was taught to always set the pre-columns pressure, which makes sense since as far as I can tell – this is the actual pressure inside the column (pressure felt by the resin). However, If I open the documentation on the HisTrap 5 mL column from GE-healthcare, I can’... | {
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "biochemistry, proteins, purification, chromatography",
"url": null
} |
biochemistry, enzymes, enzyme-kinetics
Title: Do we actually know the molecular dynamics of any enzyme? That is right, is there a limitation, say Heisenberg's uncertainty principle or something that limits our understanding of machinery of enzymes at atomic level? Can we know how do they actually work?
As far as I can... | {
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ros
Originally posted by aarsh_t with karma: 328 on 2022-04-26
This answer was ACCEPTED on the original site
Post score: 1
Original comments
Comment by anonymous60874 on 2022-04-27:
Yeah it really works. Thanks. I also tried "globals()[move_datatype]" and it works also too. | {
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ros, ros2, ament, colcon
# STEP 2: ADD EXECUTABLE AND AMENT DEPENDENCIES/////////////////
add_executable(hello src/hello.cpp)
ament_target_dependencies(hello rclcpp std_msgs)
add_executable(listen src/listen.cpp)
ament_target_dependencies(listen rclcpp std_msgs)
target_include_directories(hello PUBLIC
$<BUILD_I... | {
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"url": null
} |
general-relativity, cosmology, lagrangian-formalism, space-expansion, gravitational-redshift
The above is how we normally talk about all this. But relativity is called 'relativity' for a reason. You can if you like invoke a measure of time and distance such that, in your adopted coordinate system, ordinary stuff gets ... | {
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"openwebmath_score": null,
"tags": "general-relativity, cosmology, lagrangian-formalism, space-expansion, gravitationa... |
c#, repository, .net-core
Title: Repository Pattern and SOLID principles I have written the following Repository in C#, using NetCore 2.2 and EF Core.
I was thinking how to write properly the Search method according to the SOLID principles.
This code gives a null reference exception when "Title" or "Genre" property is... | {
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"openwebmath_score": null,
"tags": "c#, repository, .net-core",
"url": null
} |
$${{\bf{R}}_{{\bf{sh}}}} = \frac{{{{\bf{R}}_{\bf{m}}}}}{{{\bf{m}} - 1}}$$
Rsh = shunt resistance
Rm = meter resistance
m = I / Im = multiplying factor or multiplying power
For the voltmeter, a high series resistance (Rse ≫≫Rm) is connected to increase its range
$${{\bf{R}}_{{\bf{se}}}} = {{\bf{R}}_{\bf{m}}}\left( ... | {
"domain": "testbook.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9850429134068499,
"lm_q1q2_score": 0.8098915722090281,
"lm_q2_score": 0.8221891261650247,
"openwebmath_perplexity": 3531.57954022891,
"openwebmath_score": 0.6525428891181946,
"tags": nu... |
If you want to simply sample the intersection, you can do this:
RandomPoint[
ImplicitRegion[
RegionMember[
RegionIntersection[Sphere[{0, 0, 0}, 1],
Sphere[{1, 1, 1}, 1.5]], {x, y, z}], {x, y, z}], 100] //
Point // Graphics3D
This should work, but maybe it doesn't because of the single-dimensional nature of the sampl... | {
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9669140225647108,
"lm_q1q2_score": 0.8275344734532024,
"lm_q2_score": 0.8558511451289037,
"openwebmath_perplexity": 5803.58279143883,
"openwebmath_score": 0.17310933768749237,
"tag... |
inorganic-chemistry, equilibrium, analytical-chemistry, stoichiometry, elemental-analysis
30.3 g SiO2
12.94 g Na2O
56.76 g H2O
##
If I add 7.7 g of 50% NaOH I now have this mass added to my system.
2.98 g Na2O (using same logic above)
4.72 g H2O
Allowing time for stirring, I could then expect my new desired SiO2/Na... | {
"domain": "chemistry.stackexchange",
"id": 16386,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "inorganic-chemistry, equilibrium, analytical-chemistry, stoichiometry, elemental... |
radioactivity, ideal-gas
In the idealized case when no high energy particle leaves the idealized contained, the total charge balance remains neutral. There would be neutral atoms, molecules, ionic pair, ions and electrons that would eventually recombine to neutral $\pu{1 mol}$ of lead-206, $\pu{8 mol}$ helium-4 of , t... | {
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"id": 17459,
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "radioactivity, ideal-gas",
"url": null
} |
I know this is a problem involving permutations, but having that extra empty chair is throwing me off and I cannot wrap my head around this problem. And advice would be great! Thank you!
• If B is Brother, p is person, and O is open, it'll be rotations of BOppBppp, BpOpBppp, BppOBppp, BppBOppp, BppBpOpp, BppBppOp, Bpp... | {
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"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9830850852465429,
"lm_q1q2_score": 0.8127280387455357,
"lm_q2_score": 0.8267117983401363,
"openwebmath_perplexity": 866.1971131004757,
"openwebmath_score": 0.612453043460846,
"tags... |
inorganic-chemistry, stability, halides
To illustrate the problem at hand, take a look at similar, known compound with a fluorine oxygen bond: hypofluorous acid, $\ce{HFO}$, which is actually better described as hydroxylfluoride, $\ce{HOF}$. According to Holleman and Wiberg's[1,2] textbook the synthesis of this compou... | {
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"id": 3011,
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"tags": "inorganic-chemistry, stability, halides",
"url": null
} |
python, performance, python-3.x, programming-challenge, depth-first-search
class Solution(object):
def judge_point_24(self, nums):
"""
:type nums: List[int]
:rtype: bool
"""
if len(nums) == 1:
return nums[0] == 24 or abs(nums[0] - 24.0) <= 0.1
for i in ra... | {
"domain": "codereview.stackexchange",
"id": 34703,
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"openwebmath_score": null,
"tags": "python, performance, python-3.x, programming-challenge, depth-first-search",
... |
process-scheduling, multi-tasking
The more compelling reason is to optimise FPU context switching.
When an operating system switches between two threads (not to mention the fact that the operating system itself is software that uses CPU registers), the contents of the CPU registers needs to be saved and restored. A ty... | {
"domain": "cs.stackexchange",
"id": 18550,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "process-scheduling, multi-tasking",
"url": null
} |
java, android, asynchronous, thread-safety, promise
/**
* Fulfills this {@code Promise} with the value of type {@code T}, <em>unless</em> this {@code Promise}
* was already previously resolved.
*
* @param fulfillValue the final value with which this {@code Promise} should be fulfilled
*/
p... | {
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"openwebmath_score": null,
"tags": "java, android, asynchronous, thread-safety, promise",
"url": null
} |
Seq. Geometric sequences are used in several branches of applied mathematics to engineering, sciences, computer sciences, biology, finance Problems and exercises involving geometric sequences, along with detailed solutions and answers, are presented. The formula is then used to find another term of the sequence. For ex... | {
"domain": "givelife.ph",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9865717468373085,
"lm_q1q2_score": 0.8443585556551937,
"lm_q2_score": 0.8558511414521922,
"openwebmath_perplexity": 333.5769276148712,
"openwebmath_score": 0.7515195608139038,
"tags": nu... |
electromagnetism, waves, electric-fields, maxwell-equations, greens-functions
This bit is a bit abstract, but we move two of the integrals inside,
$$\vec{E}(\vec{r}, t)=-\frac{\mu_0}{4\pi}\int_C{{\frac{1}{|\vec{r}-\vec{r}'|}\cdot\frac{\partial}{\partial t} \iint_A{\vec{J}(\vec{r}',t-\frac{|\vec{r}-\vec{r}'|}{c})d^2\ve... | {
"domain": "physics.stackexchange",
"id": 91494,
"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, waves, electric-fields, maxwell-equations, greens-functions",
... |
organic-chemistry, nomenclature, polymers
which attacks one carbon and opens up the double bond leaving a radical at the end. This radical attacks another ethylene molecule, etc. The chain stops forming when it encounters another radical. So, from ethylene, we get polyethylene (even though it looks like polymethylene)... | {
"domain": "chemistry.stackexchange",
"id": 5920,
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "organic-chemistry, nomenclature, polymers",
"url": null
} |
c++, event-handling, pointers, callback
template <>
bool isTypeAllowed<sf::Event::KeyEvent>(sf::Event::EventType type)
{
return (type == sf::Event::KeyPressed || type == sf::Event::KeyReleased);
}
You can use this function to check if the specified EventType is valid for the T event data type. You can do this che... | {
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"id": 22483,
"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++, event-handling, pointers, callback",
"url": null
} |
php, sql, security, sql-server
// This block of code is used to undo magic quotes. Magic quotes are a terrible
// feature that was removed from PHP as of PHP 5.4. However, older installations
// of PHP may still have magic quotes enabled and this code is necessary to
// prevent them from causing probl... | {
"domain": "codereview.stackexchange",
"id": 16456,
"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, sql, security, sql-server",
"url": null
} |
ros, laser, scan, velocity, laserscan
+bvbdort I'll post the code now!
Comment by dornhege on 2014-07-24:
linear.x is zero in the code you posted. I don't know how you want to limit that more.
Comment by sterlingm on 2014-07-24:
If you just want to enforce a max velocity, check the value of vel.linear.x and change it ... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "ros, laser, scan, velocity, laserscan",
"url": null
} |
performance, strings, vba, reinventing-the-wheel
If stringLastPosition > 0 Then
codeString = Mid$(ActiveSheet.Cells(counterRow, inputRange.Column), stringLastPosition, Len(ActiveSheet.Cells(counterRow, inputRange.Column)))
codeArray = Split(codeString, ",")
... | {
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"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "performance, strings, vba, reinventing-the-wheel",
"url": null
} |
quantum-field-theory, quantum-chromodynamics, symmetry-breaking, scale-invariance
Analogously, if a mass term is assumed to arise because of the spontaneous symmetry breaking of scale invariance, it must be compensated with the dilaton insersion. For example
\begin{equation}
m\bar{\psi}\psi\rightarrow \frac{m}{f}\chi(... | {
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"openwebmath_score": null,
"tags": "quantum-field-theory, quantum-chromodynamics, symmetry-breaking, scale-invariance"... |
ros, gazebo, ros-melodic
Title: Adding gazebo_ros_camera to gazebo model
Hi All,
How would I add/attach camera to a model (like a cylinder which is defined in the world file) in Gazebo? I know how to add camera to a robot link. But I want to add camera to a standalone model defined in the world file.
Thank You, | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "ros, gazebo, ros-melodic",
"url": null
} |
c++, tic-tac-toe
return d1 || d2;
}
bool Grid::checkRow(int index) const
{
return same(cells[index][0],
cells[index][1],
cells[index][2]);
}
bool Grid::checkColumn(int index) const
{
return same(cells[0][index],
cells[1][index],
cells[2][index])... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c++, tic-tac-toe",
"url": null
} |
### Show Tags
30 Oct 2018, 10:20
Bunuel wrote:
When a company places a wholesale order on coffee cups with the company logo, they pay $692 for 80 cups. When Phil wants to buy just one such cup, it costs him$12.50. How much above the wholesale price per cup is he paying?
A. $0.55 B.$3.85
C. $7.35 D.$10.65
E. $14.25 Th... | {
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"id": null,
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9697854181721518,
"lm_q1q2_score": 0.8143617531027467,
"lm_q2_score": 0.839733963661418,
"openwebmath_perplexity": 14523.676076091233,
"openwebmath_score": 0.19278892874717712,
"tags": ... |
electrostatics, charge
Mathematical derivation
Surface charge density
Let's choose a surface $S(x,y,z)$ having an infinitesimal thickness $\mathrm d t$. Now let's choose an infinitesimal area element on the surface, at the point $(x_0,y_0,z_0)$, having an area $\mathrm d A$. Thus the charge contained in that infinites... | {
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"id": 70251,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "electrostatics, charge",
"url": null
} |
quantum-mechanics, homework-and-exercises, wavefunction, schroedinger-equation, quantum-tunneling
If the area of the potential in a section is infinite, the wave function in that section is zero. You might want to check out problem 2.31 in Griffiths (mine is the second edition)- it's not exactly the same thing, but it... | {
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"tags": "quantum-mechanics, homework-and-exercises, wavefunction, schroedinger-equation, qua... |
Thanks
Retired Moderator
Joined: 16 Nov 2010
Posts: 1437
Location: United States (IN)
Concentration: Strategy, Technology
Re: A farmer has an apple orchard: MGMAT, PS [#permalink]
### Show Tags
01 Apr 2011, 21:35
1
Let x be the number of apple trees
0.1x of apple trees are cross-pollinated
3x/4 = Fuji
3x/4 + 0.1x... | {
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"id": null,
"lm_label": "1. Yes\n2. Yes\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 1,
"lm_q1q2_score": 0.8705972768020107,
"lm_q2_score": 0.8705972768020107,
"openwebmath_perplexity": 9131.965340582265,
"openwebmath_score": 0.5062430500984192,
"tags": null,
"url":... |
java, beginner, android, tic-tac-toe
}
}if(gameOver)
for(i=1;i<=3;i++)
{
for(j=1;j<=3;j++)
{
b[i][j].setEnabled(false);
}
}
return gameOver;
}
}
} T... | {
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"id": 12588,
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "java, beginner, android, tic-tac-toe",
"url": null
} |
c++, performance, strings, c++11, file
std::string str;
while (std::getline(in_file, str)) {
out_file << str << add_string << "\n";
} | {
"domain": "codereview.stackexchange",
"id": 10777,
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"tags": "c++, performance, strings, c++11, file",
"url": null
} |
python, playing-cards
def getPoints(n):
n = (n-1) % 13 + 1
#the ace values
if n == 1:
return [1,11]
#the regular card values
if 2<=n<=10:
return [n]
if 11<=n<=13:
return [10] | {
"domain": "codereview.stackexchange",
"id": 22421,
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"tags": "python, playing-cards",
"url": null
} |
ros-kinetic, rosbridge
Originally posted by Lane on ROS Answers with karma: 3 on 2018-03-23
Post score: 0
Original comments
Comment by gvdhoorn on 2018-03-24:
Is package ### present in your workspace / installed on your system? Does rospack find #### return the expected output (in the same terminal as where you start... | {
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"tags": "ros-kinetic, rosbridge",
"url": null
} |
ros, diff-drive-controller, nodes, ros-indigo
Title: how to use diff_drive_controller
I have installed ros_control, ros_controllers, and diff_drive_controller under ROS indigo. however, I am having issues getting the diff_drive_controller node to rosrun.
normally i can tab complete the node executable (e.g rosrun joy... | {
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"id": 19970,
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"tags": "ros, diff-drive-controller, nodes, ros-indigo",
"url": null
} |
$$\overrightarrow{a}= r\,(\cos A, \sin A) \qquad\text{and}\qquad \overrightarrow{b} = s \,(\cos B, \sin B )$$ so that
$$\overrightarrow{a}\cdot\overrightarrow{b} = r s \cos A \cos B + r s\sin A \sin B = r s \cos(A-B)$$
I think Augustin was answering a much more general question. In two dimensions, where we have "cosi... | {
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"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9828232889752297,
"lm_q1q2_score": 0.82736585527566,
"lm_q2_score": 0.8418256512199033,
"openwebmath_perplexity": 254.84568358993587,
"openwebmath_score": 0.9996201395988464,
"tags... |
newtonian-mechanics, friction
These lines are taken from a reputed book. I was confused with this. Firstly, the feet is moving relative to the ground. So, why can't the friction be kinetic in nature. Secondly, for the frictional force to be static $f_s = ma$ , so while walking with constant velocity we get $f = 0$ but... | {
"domain": "physics.stackexchange",
"id": 79712,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "newtonian-mechanics, friction",
"url": null
} |
The problem: Finding palindromes in two consecutive bases for a fixed case of $$d=2l+1$$ digits.
Finding $$b,b+1$$ palindromes is equivalent to $$b,b-1$$ palindromes, so lets work with the latter.
We want to find palindromes with $$d$$ digits in both bases exactly. - Thus we will exclude solutions with $$(d,d+k)$$ di... | {
"domain": "stackexchange.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9715639653084244,
"lm_q1q2_score": 0.8238549140504406,
"lm_q2_score": 0.8479677545357569,
"openwebmath_perplexity": 415.7623864800823,
"openwebmath_score": 0.7537059187889099,
"tag... |
php, datetime
$interval = $end->diff($start);
$units = array(
"%y" => sp("year", "years"),
"%m" => sp("month", "months"),
"%d" => sp("day", "days"),
"%h" => sp("hour", "hours"),
"%i" => sp("minute", "minutes"),
"%s" => sp("second", "seconds")
);
$result = a... | {
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"id": 6474,
"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, datetime",
"url": null
} |
c#, winforms, mvp, rubberduck
Control.Invoke((MethodInvoker)delegate
{
Control.SolutionTree.Nodes.Add(node);
Control.SolutionTree.Refresh();
AddProjectNodes(project, node);
});
});
... | {
"domain": "codereview.stackexchange",
"id": 13437,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c#, winforms, mvp, rubberduck",
"url": null
} |
java, sudoku
/**
* The entry point for the program. Currently it does not accept any input.
* It won't be difficult to do that. I encourage everyone to tinker with
* the code.
*
* @param args The command-line arguments (which are ignored)
*/
public static void main(String[] args) {
... | {
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"id": 19281,
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "java, sudoku",
"url": null
} |
c++, stl
virtual ~Point2D() {
used_count--;
std::cout << "~Point2D(), used_count = " << used_count << "\n";
}
Point2D operator-(const Point2D& other) {
return Point2D(_x - other._x, _y - other._y);
}
Point2D operator-(Point2D& other) {
return Point2D(_x - other._x, _y -... | {
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "c++, stl",
"url": null
} |
# Finding $N(D_{4})/D_{4}$ for $D_{4}$ in $D_{16}$
I want to find $N(D_{4})/D_{4}$ where $N(D_{4})$ is the normalizer of $D_{4}$ in $D_{16}$. I'm not too clear on what the normalizer of $D_{4}$ in $D_{16}$
Is there a nice way to find $N(D_{4})/D_{4}$? I can't seem to figure this exercise out and would appreciate some... | {
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"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9777138177076645,
"lm_q1q2_score": 0.8168637986933044,
"lm_q2_score": 0.8354835371034368,
"openwebmath_perplexity": 77.48108441475499,
"openwebmath_score": 0.9502547979354858,
"tag... |
ros, pcl, ros-fuerte, pcl-1.7
Checkout pcl17 and pcl17_ros packages as suggested by others. Linekd the libfiles and now I get this message.
[100%] Building CXX object CMakeFiles/minitof_listener.dir/src/main.o
In file included from /home/crops_laszlo/fuerte_workspace/sandbox/fuerte-unstable-devel/pcl17/include/pcl-1.7... | {
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"id": 14560,
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"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "ros, pcl, ros-fuerte, pcl-1.7",
"url": null
} |
special-relativity
In my point of view Feynman uses the principle of relativity as a kind of an axiom for his derivation of time dilation.
Question: How do we know that the principle of relativity is true and can use it like an axiom for new phenomena?
If we had treated Newton's laws of motion as axioms we would never... | {
"domain": "physics.stackexchange",
"id": 13751,
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"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "special-relativity",
"url": null
} |
python, programming-challenge, string-processing
The initialization sequence (your puzzle input) is a comma-separated list of steps to start the Lava Production Facility. Ignore newline characters when parsing the initialization sequence.
The way I interpret this description is that function total_hash is really the ... | {
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"lm_q1_score": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python, programming-challenge, string-processing",
"url": null
} |
javascript, html, animation
And this how my html looks like
HTML
<li class="one-third animate-box" data-animate-effect="fadeIn">
<img id="myImg" src="images/Images/gallery-1.jpg" alt="Ash Image Gallery 1" height="100%" width="100%">
</li>
<li class="one-third animate-box" data-animate-effect="fadeIn">
<img id=... | {
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"id": 27086,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "javascript, html, animation",
"url": null
} |
classical-mechanics
Title: What amount of force is needed to topple a person? Assuming no sliding and that the shoulder is 1.2m from the feet, what force is required to topple a person weighing 70 Kg standing with his feet spread 0.9 m? If possible, please include an explanation about your answer. Approximate the pers... | {
"domain": "physics.stackexchange",
"id": 81059,
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"lm_name": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "classical-mechanics",
"url": null
} |
way. Ques 1. Hope you find this Time Speed Distance CAT Problems Test useful. Jan 16, 2018 You can solve Time and Distance Problems within 35 seconds, if you have all the Time The relationship between Speed, Distance and Time. Select the best Algebra 1 - Word Problems Worksheets Distance, Rate, and Time Word Problems. ... | {
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"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9845754506337407,
"lm_q1q2_score": 0.8003292124605091,
"lm_q2_score": 0.8128673246376009,
"openwebmath_perplexity": 842.279061976792,
"openwebmath_score": 0.5783324241638184,
"tags... |
a slope, or intercept step-by-step This website uses cookies to ensure you get the best experience. Certainly P(1;1) is one point on the tangent line, but there is no obvious way to come up with a second point. Secant modulus generalises to the "Secant modulus from one stress to another": it becomes the slope of the li... | {
"domain": "otticamuti.it",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9873750496039277,
"lm_q1q2_score": 0.8291323699645727,
"lm_q2_score": 0.8397339696776499,
"openwebmath_perplexity": 238.17182620148998,
"openwebmath_score": 0.7098960280418396,
"ta... |
In particular we might as well choose $p_1, p_2, \ldots, p_r$ to be all the primes dividing $n$. In this case, since $\phi(n)/n$ is the probability that none of these events occur, we have
$$\frac{\phi(n)}{n} = \mathbb P(\overline{E_{p_1}} \cap \overline{E_{p_2}} \cap \cdots\cap\overline{E_{p_r}}) = \mathbb P(\overlin... | {
"domain": "stackexchange.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.979354072876341,
"lm_q1q2_score": 0.8029658864710856,
"lm_q2_score": 0.8198933447152497,
"openwebmath_perplexity": 249.3867757955395,
"openwebmath_score": 0.9280976057052612,
"tags... |
electromagnetism, frequency, plasma-physics, conductors, radio-frequency
Is there any way to heat air using em radiation other than with light?
The short answer is yes. There are three basic energy transport methods: thermal conduction, radiation, and convection. A standard oven used for cooking food (i.e., not a ... | {
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"id": 37681,
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"tags": "electromagnetism, frequency, plasma-physics, conductors, radio-frequency",
"url"... |
particle-physics
Poincaré group acts in $H_{orbital}\otimes H_{spin}$.
The space $H_{internal}$ describes all internal degrees of freedom of the particle, in particular the electrical charge. The charge conjugation operator $C$ is a unitary involutive operator acting in $H_{internal}$. More precisely it has the form ... | {
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"id": 13860,
"lm_label": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "particle-physics",
"url": null
} |
magnetic-fields, electrons, schroedinger-equation
Obviously I am misunderstanding something basic about the derivation. Any suggestions? If you write down the Hamiltonian with the vector potential you provided, you should see that the Hamiltonian commutes with $p_{y} = -i\hbar\partial_{y}$. Given that, you know that t... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "magnetic-fields, electrons, schroedinger-equation",
"url": null
} |
experimental-chemistry
Title: How to measure and transfer suspensions? I need to measure and transfer 10 ml of a fairly dilute suspension at a time to another container.
But no matter how diligently I do it, sedimentation happens quickly after mixing and successive transfers have different strengths or concentrations ... | {
"domain": "chemistry.stackexchange",
"id": 10809,
"lm_label": null,
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "experimental-chemistry",
"url": null
} |
ros, nodes
Title: Node Latency Questions
Hello everyone. I'm trying to understand the different latency issues that occur when using topics to stream data between nodes.
The default method is using TCPROS, which from how it was explained to me converts the data into XML data before it gets transmitted, and then has t... | {
"domain": "robotics.stackexchange",
"id": 17304,
"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": "ros, nodes",
"url": null
} |
c#, algorithm, interview-questions
I have worked on the algorithm over 20 times, but I could not come out better idea for my own question here last 5 months. But on April 28, 2018 I had five mock interviews a day. At 12:00 AM, I had chance to interview a peer using array quadruplet again. I found out that the peer had... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c#, algorithm, interview-questions",
"url": null
} |
python, pygame
if event.type == E5:
B_SPAWN = random.uniform(1000, 6000)
pygame.time.set_timer(E5, 1 * int(B_SPAWN))
bullet = pygame.Rect(WIDTH, 350, BULLET_WIDTH, BULLET_HEIGHT)
BULLETS_R.append(bullet)
if event.type == E... | {
"domain": "codereview.stackexchange",
"id": 44446,
"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, pygame",
"url": null
} |
quantum-mechanics, electromagnetism, electricity, conductors, fermi-energy
In that example, the charge on the capacitor is supplying the potential, but you can also think about a potential applied to a long cylinder of conductor, and for a return path in the circuit imagine a larger coaxial cylinder far away, and find... | {
"domain": "physics.stackexchange",
"id": 90025,
"lm_label": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "quantum-mechanics, electromagnetism, electricity, conductors, fermi-energy",
"ur... |
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