text stringlengths 1 1.11k | source dict |
|---|---|
gravity, general-relativity, dark-matter
$$M_\mathrm{halo}(800\rho)\simeq M_\mathrm{acc}(\rho),$$
that is, material accreted when the universe was denser than $\rho$ settles into regions denser than $\sim 800\rho$.
Despite this, the structures of dark matter halos tend to be pretty consistent. | {
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"tags": "gravity, general-relativity, dark-matter",
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} |
quantum-mechanics, homework-and-exercises, angular-momentum, quantum-spin
Title: Why does dot product equal to one? (Pauli spin matrices) I was reading these lecture notes (NB: PDF): | {
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• This is a clever way to formalize this. Thanks! – Tuatarian May 7 at 16:10
• @Tuatarian It's pretty much the first example you will see in a dynamical systems class (cosine is a little more interesting). – Brady Gilg May 7 at 18:53
We know that $$\sin(\mathbb{R})=[-1,1]$$ Since the sine function is odd, it will be e... | {
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c++, beginner, interview-questions, math-expression-eval
Also among your big block of variables:
string tempNumStr = "", tempVar = "", leftSide = "", line = "";
bool leftSideComplete = false, additionTime = false, justHadEquals = false, errorExists = false;
It is bad practice in C++ to declare a bunch of stuff in one... | {
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"tags": "c++, beginner, interview-questions, math-expression-eval",
"url": null
} |
vba, event-handling, ms-access
This sets up a custom event handler for all objects. I put this on the form_current
Class: EventHandlerManager
Public Sub initFormHandlers(p_form As Form)
Dim ctl
'types - http://msdn.microsoft.com/en-us/library/office/aa224135(v=office.11).aspx
Dim txt As EH_... | {
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"tags": "vba, event-handling, ms-access",
"url": null
} |
quantum-gravity, quantum-entanglement, renormalization, geometry
I had a bias against AQFT as being too abstract an obtuse branch of study to be of any practical use. However, in light of the possibility (recently discussed on physics.SE) that classical geometry arises due to the entanglement between the degrees of fr... | {
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"tags": "quantum-gravity, quantum-entanglement, renormalization, geometry",
"url": null
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Projected percentage of workers in the labor force for Solutions: a. Browse and Search the Library Home : Math Topics : Prob/Stat : Probability. Students in the class were able to work on the assigned problems in the PDF file, then use the problem set checker to input each answer into a box and find out if the answer w... | {
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"tag... |
ros, publisher
Originally posted by Chrissi with karma: 1642 on 2014-08-22
This answer was ACCEPTED on the original site
Post score: 3
Original comments
Comment by alfa_80 on 2014-08-22:
In my case, I need to publish those box values. In the box node, is there a way to do that as the number of boxes are unknown befor... | {
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} |
The variance of $\tau_b$ assuming the independence hypothesis is:
$var_0(\tau_b) =\frac{4}{w_r w_c} \left\{ \sum_{i=1}^I \sum_{j=1}^J n_{ij} d_{ij} ^2 -4(C-D)^2/n \right\}$
As concerns Stuart's $\tau_c$ we have that:
$var(\tau_c)= \frac{4m^2}{(m-1)^2 n^4} \left\{ \sum_{i=1}^I \sum_{j=1}^J n_{ij} d_{ij} ^2 -4(C-D)^2/... | {
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"openwebmath_score": 0.7701351642608643,
"tags": null,... |
machine-learning, neural-network, logistic-regression, backpropagation, loss-function
Almost. Backpropagation is a fancy term for using the chain rule.
It becomes more useful to think of it as a separate thing when you have multiple layers, as unlike your example where you apply the chain rule once, you do need to ap... | {
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"tags": "machine-learning, neural-network, logistic-regression, backpropagation, loss-fu... |
c++, ros2, errors, ros-galactic
Still, it seems to be finding the spdlog installation of ROS2 instead of the one we use.
Changing the find package into:
find_package(spdlog 1.9.2 REQUIRED)
makes it so that it finally finds our installation instead of the ROS2 one but downstream it does not seem to find it anymore and... | {
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"tags": "c++, ros2, errors, ros-galactic",
"url": null
} |
geology, geothermal-heat, mapping, natural-conditions, underground-water
Start here: https://www.builditsolar.com/Projects/Cooling/EarthTemperatures.htm
A graph on that page shows how soil temps vary with depth depending on seasonal variation, and moisture levels. Ball park: 30 feet gets out out of the seasonal vari... | {
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"tags": "geology, geothermal-heat, mapping, natural-conditions, underground-water",
"... |
c#, console, graphics
/// <summary>
/// Convert a 1-dimensional index to a 2-dimensional index in the form
/// of a int array with two values.
/// </summary>
/// <param name="index">The index to convert/</param>
/// <returns>A 2-dimensional index.</returns>
[MethodImpl(... | {
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"tags": "c#, console, graphics",
"url": null
} |
c#, .net, iterator, lazy
public static class IEnumerableTCountExtensions
{
public static bool CountAtLeast<T>(this IEnumerable<T> items, Func<T, bool> predicate, int required)
{
var count = 0;
foreach (T item in items)
{
if (predicate(item))
{
cou... | {
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"tags": "c#, .net, iterator, lazy",
"url": null
} |
biochemistry, toxicology, mitochondria, poison
$10^{22}$ is a huge number. That's about 250 million molecules per human cell in an adult (taking # of human cells from Bianconi et al). Even so, it isn't likely that cyanide molecules be perfectly bound at every molecule of cytochrome c oxidase, just that there is enough... | {
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"tags": "biochemistry, toxicology, mitochondria, poison",
"url": null
} |
python, algorithm, recursion, pathfinding
Is the solution pythonic, if not what can be done to improve?
Because of the recursion, after I reach the ending point, I cannot directly return the true_path because the dead ends encountered by the player makes the function return None. So I have to save it in another varia... | {
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"tags": "python, algorithm, recursion, pathfinding",
"url": null
} |
understand how to add and subtract Vectors, then you will have to practise a lot. transpose operator to a column vector (as a special case of a matrix): the column vector ⎛ √ ⎞ 3 ⎜ ⎝ ⎟ v = −7 ⎠, π. Prerequisite knowledge: Relative Motion Vector Addition: physics challenge problem This video demonstrates a relative moti... | {
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"id": null,
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"lm_q1_score": 0.9820137868795702,
"lm_q1q2_score": 0.8051465596377749,
"lm_q2_score": 0.819893335913536,
"openwebmath_perplexity": 559.1494305728536,
"openwebmath_score": 0.7407938241958618,
"t... |
For the original problem, c=6496, and we want to factor 6497=73x89. LittleWolf's analysis calls for 2 solutions:
(0,6496)
(72,88)
LittleWolf is solving for x+1 and y+1, not x and y. The number of solutions is derived from (c+1) = (x+1)(y+1). He calculated the number of solutions of the form ((x+1),(y+1)), where (x+1) ... | {
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9828232889752296,
"lm_q1q2_score": 0.8293997544548338,
"lm_q2_score": 0.8438950966654774,
"openwebmath_perplexity": 2643.986111878477,
"openwebmath_score": 0.4876786768436432,
"tag... |
c++, c++11, community-challenge, sdl, simon-says
lastUserColor = static_cast<ColorIndex>(i);
userInputColors.push_back(lastUserColor);
std::cout << "Clicked square #" << i << "\n";
}
}
}
}
void SimonSaysGame::checkFailCondition()
{
if (lastUserColor == Color... | {
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"tags": "c++, c++11, community-challenge, sdl, simon-says",
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} |
We can see that reverse triangular arbitrage can detect a selling opportunity (i.e. the bid currency is overvalued), whilst forward triangular arbitrage can detect a buying opportunity (the ask currency is undervalued).
The list of candidate currencies could be extended, and the arbitrage condition could be elegantly ... | {
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"lm_q1_score": 0.9881308786041316,
"lm_q1q2_score": 0.8124304614636026,
"lm_q2_score": 0.8221891239865619,
"openwebmath_perplexity": 2287.870760814901,
"openwebmath_score": 0.6073945760726929,
... |
python, matplotlib
dates = pd.date_range(start = '1/1/2018', end = '10/10/2018')
return_values = np.random.random(len(dates))
ewma_values = 0.5 + np.random.random(len(dates))*0.1
plot_returns(dates, return_values, ewma_values, "Example")
Is there any way for me to reduce the number of lines to achieve exactly the sam... | {
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"tags": "python, matplotlib",
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} |
python
def __str__(self):
'''Output the important game information as a string.'''
if self.game_over:
return self.__str_finished_game()
else:
return self.__str_game_in_progress()
def __str_finished_game(self):
'''Output a finished game as a string.'''
... | {
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t, then a|nt., Exercise. For any positive integer a and integer b, there exist unique integers q and r such that b = qa + r and 0 ≤ r < a, with r = 0 iff a | b. We then give a few examples followed by several basic lemmas on divisibility. Lemma. Theorem. Prove variant of the division algorithm. You will see many example... | {
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"lm_q2_score": 0.8267117983401363,
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"openwebmath_score": 0.8721988201141357,
"tags": nul... |
Julie Compound Interest Calculation Total
Aj = 10,000(1.05)^4
Aj = 12,155.0625
Romeo Simple Interest Calculation
(Ir) = (12,298.73865)(0.03)(t)
(Ir) = (368.94)(t)
Juliet Simple Interest Calculation
(Ir) = (12,155.0625)(0.05)(t)
(Ir) = 607.753125(t)
Equate the two to equal each other.
(368.94)(t) = 607.753125(t)
(36... | {
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"lm_q1_score": 0.9674102571131692,
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"lm_q2_score": 0.8976952811593495,
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"openwebmath_score": 0.5630732178688049,
"tags... |
newtonian-mechanics, classical-mechanics, harmonic-oscillator, oscillators, approximations
is not enough. Harmonic oscillations aren't just oscillatory; they also have a period which is independent of the initial amplitude. Your system doesn't satisfy this, so it can't be understood as a harmonic oscillation.
For the ... | {
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"tags": "newtonian-mechanics, classical-mechanics, harmonic-oscillator, oscillators, approx... |
# What is the dimension of $\Bbb Q[x]/\langle (x+1)^2 \rangle$ over $\Bbb Q$?
What is the dimension of $$\Bbb Q[x]/\langle (x+1)^2 \rangle$$ over $$\Bbb Q$$?
First we identify this ring. I know $$\Bbb Q[x]/\langle (x-a)(x-b) \rangle \simeq \Bbb Q \times \Bbb Q$$ where $$a,b$$ are distinct. But how to deal with this r... | {
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"lm_q1q2_score": 0.8122398205637471,
"lm_q2_score": 0.8418256512199033,
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"openwebmath_score": 0.9584288597106934,
"tag... |
c#, design-patterns, classes, static
Title: C# static class holding list of member class instances I was wondering if such a design was a bad idea in C#. Here I have a static class EventLog which holds a list of instances of Event class. This is a simple event log of actions players can do in a game. What can I be doi... | {
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-
Thanks! Just what I was looking for. Skimming through their paper, the examples are for n>=8, right? If so, what can be said about n=3 and n=4 for my simpler question, about fields with equal regulators? – danseetea May 5 '10 at 12:25
You're welcome. I don't know anything about fields of small degree with equal regu... | {
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"openwebmath_score": 0.8478701114654541,
"tag... |
reference-request, ds.data-structures, total-ordering, cache-oblivious
At the beginning how many chunks do I have? I suppose one.
When the array is full according to the target density, do I need to grow the array and how? I suppose yes, always by a power of two (number of chunks).
Is there a possibility that a tree ... | {
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"tags": "reference-request, ds.data-structures, total-ordering, cache-oblivious",
"url": ... |
php, mysqli
public function query($q)
{
global $config, $debug, $err;
$start = microtime(true);
$res = parent::query($q);
// my_dump($q,false);
$end = microtime(true);
if ($config['core']['debug'])
{
$time = ($end - $start);
$debug['db']['c... | {
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"openwebmath_score": null,
"tags": "php, mysqli",
"url": null
} |
operating-systems, paging, memory-allocation
Some objects in Solaris require complex and expensive construction and destruction (e.g. objects which have a kernel lock), and so they could be "partly free" (i.e. constructed but not allocated). Solaris also optimises free slab allocation by maintaining free lists on a pe... | {
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"tags": "operating-systems, paging, memory-allocation",
"url": null
} |
ros, docker
The ros_core variant of ROS Noetic on Ubuntu Focal
and similar for Debian Buster.
Those Dockerfiles are not written by hand, but generated using the scripts in the osrf/docker_images repository. Those scripts parse a large .yaml file which contains information on all the different OS + ROS version + varia... | {
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"openwebmath_score": null,
"tags": "ros, docker",
"url": null
} |
c#, websocket, asp.net-core
However you do not need to re-define a new delegate for each event (not to mention that inner classes - and delegates as extension - are often discouraged). You can use EventHandler<T>:
public event EventHandler<BackendChangedEventArgs> OnBackendChanged;
For OnBackendClosed similarly:
pub... | {
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"tags": "c#, websocket, asp.net-core",
"url": null
} |
python, performance, multithreading, logging
file_size_dl += len(buffer)
f.write(buffer)
status = r"%10d [%3.2f%%]" % (file_size_dl, file_size_dl * 100. / file_size)
status = status + chr(8)*(len(status)+1)
sys.stdout.write('%s\r' % status)
time.sleep(.05)
... | {
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"openwebmath_score": null,
"tags": "python, performance, multithreading, logging",
"url": null
} |
where a<=t<=b. Surface Area Generated by a Parametric Curve Recall the problem of finding the surface area of a volume of revolution. This is an applet to demonstrate and give some examples of parametric curves and surfaces. the question is: Find an equation of the tangent plane to the parametric surface. If you would ... | {
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"openwebmath_score": 0.591667890548706,
"tags": n... |
c#, strings, regex, memory-management, xml
It has been tuned to be as fast as possible and should be faster than
any other encoding. Even for content that is entirely ASCII,
operations performed with UTF8Encoding are faster than operations
performed with ASCIIEncoding.
We use the constructor so that it doesn't ... | {
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} |
api, kotlin
Which option would you choose and why?
If there is another 3rd option, I'd like to hear about it too, but nothing comes to mind.
One feedback I got here is, that in languages, that are not type-safe, this can be broken/unpredictable by passing non-boolean type. | {
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optics, double-slit-experiment, interference, diffraction
Title: What is the intuitive reasoning behind a factor of 4 in the Fraunhofer double-slit intensity equation? For Fraunhofer diffraction, the intensity of a single-slit setup obeys
$I(\theta) = I_{o}\left [\frac{\sin(\frac{\pi a}{\lambda}\sin\theta)}{\frac{\pi ... | {
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"tags": "optics, double-slit-experiment, interference, diffraction",
"url": null
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machine-learning, python, scikit-learn, cross-validation
By this, I assume you meant saying, "I want to assess different model performace using K-fold Cross-validation approach and based on the performance, I want to select a model fitting"
Primarily, K-fold CV will divide the training data into a number of folds k, ... | {
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"tags": "machine-learning, python, scikit-learn, cross-validation",
"url": null
} |
bru+ cu= f in. Research highlights The full-coarsening multigrid method employed to solve 2D Poisson equation in reference is generalized to 3D. Thanks for contributing an answer to Mathematics Stack Exchange! Please be sure to answer the question. Suppose that the domain is and equation (14. The Poisson equation on a ... | {
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"openwebmath_score": 0.8025301098823547,
"tags": nu... |
regular-languages, finite-automata
Title: Automaton accepting $\{a^{2i}bc^{2k} \mid i, k \in\mathbb{N}\}$ How can I produce an automaton accepting $\{a^{2i}bc^{2k} \mid i, k \in\mathbb{N}\}$? I am essentially confused about exactly what the $2i$ and $2k$ mean. Does that mean that the automaton only accepts strings whe... | {
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"tags": "regular-languages, finite-automata",
"url": null
} |
ros-melodic, ubuntu, ubuntu-bionic
alex@alex-XPS-15-9530:~$ apt list --installed ros
Listing... Done
alex@alex-XPS-15-9530:~$ apt list --installed ros*
Listing... Done
ros-melodic-abseil-cpp/bionic,now 0.2.3-1bionic.20180719.150528 amd64 [installed]u/ bionic-security multiverse
/etc/apt/sources.list.d/ros-latest.list:... | {
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"tags": "ros-melodic, ubuntu, ubuntu-bionic",
"url": null
} |
Yi is the ithe raw score in the second set Cov(X, Y) = for an example showing how to turn raw data into a xi is the ith deviation score in the first set of show the variance within each column and the covariance between columns. X12, . The covariance matrix of any sample matrix can be expressed in the following way: wh... | {
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"openwebmath_score": 0.5929288864135742,
"tags": null,
... |
analytical-chemistry, stoichiometry
$$
\begin{align}
\ce{HA + H2O &<=>[$K_\mathrm{a}$] A- + H3O+} \label{R6}\tag{R6}\\
\ce{B + H2O &<=>[$K_\mathrm{b}$] BH+ + HO-} \label{R7}\tag{R7}\\
\end{align}
$$
Since the dissociation of the salt is complete (see \eqref{R1}), its initial concentration $c_0$ equals to the concentra... | {
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"tags": "analytical-chemistry, stoichiometry",
"url": null
} |
navigation, ekf, robot-localization, ros-kinetic
Title: robot_localization ekf faster than realtime offline post-processing
Hi,
I'm using a Robot Localization EKF configured to receive twist - linear and angular velocity derived from a wheel encoder and odometry derived from SLAM position estimates.
The EKF is workin... | {
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"tags": "navigation, ekf, robot-localization, ros-kinetic",
"url": null
} |
quantum-field-theory, path-integral, partition-function
Title: External/Background Fields Meaning (I'll work in the Euclidean for convenience)
In the path integral formulation of QFT given a field $\phi$, or a set of them if you want to, we have that the partition function is given by:
$$Z[J] = \int\mathcal{D}\phi e^{... | {
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"tags": "quantum-field-theory, path-integral, partition-function",
"url": null
} |
physical-chemistry, computational-chemistry, cheminformatics
I'm really confused about this concept and it seems like the internet doesn't offer me a lot of information about it. So please tell me how is parity related to the plane the atom lies in? How can I map the edges and dashes to the SMILES of this structure? ... | {
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"tags": "physical-chemistry, computational-chemistry, cheminformatics",
"url": null
} |
ros, actionlib-tutorials
Title: compile error for actionlib fibonacciServer.cpp tutorial
Hi.. I"m trying to compile the fibonacciServer.cpp code shown on the tutorial for the actionlib SimpleActionServer(ExecuteCallbackMethod) page. I've created the action file per the instructions and have copied the CMakeList.txt ... | {
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"tags": "ros, actionlib-tutorials",
"url": null
} |
typescript
const employeeHasProduct = await this.instanceRepository.hasInstance(
product_id,
hasEmployee.id,
);
if (employeeHasProduct) {
throw new Error(
`The enrollment employee: ${matricula} already has an instance of the product.`,
);
}
//stock checks
const stock... | {
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java, object-oriented, design-patterns, game, chess
}
}
Board.java
public class Board {
private Spot[][] spots = new Spot[8][8];
public Board() {
super();
for(int i=0; i<spots.length; i++){
for(int j=0; j<spots.length; j++){
this.spots[i][j] = new Spot(i, j);
... | {
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"tags": "java, object-oriented, design-patterns, game, chess",
"url": null
} |
beginner, vba, excel
step8 = InputBox("Step 8: Now that the solution is implemented perminently, what is the current measurement?")
Cells(31, 3).Value = step8
If step8 <> "" Then
Cells(32, 3).Value = Cells(6, 3).Value - step8
Else:
End If
step9 = InputBox("Step 9: Any other Ideas that have sp... | {
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"tags": "beginner, vba, excel",
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} |
special-relativity
\begin{array} {|c|c|}\hline \textbf{Event} & \text{Train Frame} & \text{Earth Frame} \\ \hline \text{Ball leaves the back} &\,\,\quad t'=0,\quad\quad\,\, x'=0 \quad\quad & t=0, \quad x=0 \\
\hline \text{Ball arrives at the front} & t'=3L_0/c, \quad x'= L_0 & t = {\color{red}?}, \quad x = {\color{re... | {
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"tags": "special-relativity",
"url": null
} |
performance, c, multithreading, http
struct node {
int client_socket;
struct node *next;
};
typedef struct node node_t;
node_t *head = NULL;
node_t *tail = NULL;
void enqueue(int client_socket) {
node_t *newnode = malloc(sizeof(node_t)); //create node
newnode->client_socket = client_socket; //assign ... | {
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"tags": "performance, c, multithreading, http",
"url": null
} |
There we again got a second order derivative in our simplest of physical situation. They have shown up here because acceleration is something that we can measure and position is something that we can measure and hence the equation, but to solve it mathematically we had to convert acceleration into something which invol... | {
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"lm_q2_score": 0.8333245891029457,
"openwebmath_perplexity": 175.7671619115281,
"openwebmath_score": 0.8018571734428406,
... |
structural-engineering, civil-engineering, structures
The lower arrow is pointed at a beam. I would probably refer to this as a cross beam. I may also call it a brace as it is connecting the two columns.
Photo 8:
The arrow on the left is pointed at what I would call storage tanks. If its oil or gasoline I would ref... | {
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"tags": "structural-engineering, civil-engineering, structures",
"url": null
} |
fermions, integration, calculus, grassmann-numbers, superalgebra
It is natural to expect that the integration measure $d\theta$ should be simply
$$d\theta=\frac{d\theta_{1}+i\,d\theta_{2}}{\sqrt{2}},$$
but this is wrong!
That this cannot be correct can be seen simply by expanding out the expression that would result i... | {
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"tags": "fermions, integration, calculus, grassmann-numbers, superalgebra",
"url": null
} |
thermodynamics
Title: Why is an isothermal process not unique in nature? To be clear, I have got two doubts,
One, about the non-uniqueness of an isothermal process &
Two, about the uniqueness of an adiabatic process.
The first doubt
The Wikipedia page of isothermal process states that:
For an adiabatic process, in ... | {
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"tags": "thermodynamics",
"url": null
} |
provides some subset examples. Universal Sets Learn about universal sets. set of integers, \mathbb{Z}, requires the amsfonts 1 Mar 2014 Remember to change the C to Normal Text (it must not appear in italic, as it is a symbol with fixed meaning and not a variable). A proper subset of a set A is a subset of A that is no... | {
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"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9621075766298657,
"lm_q1q2_score": 0.8505408821881333,
"lm_q2_score": 0.8840392725805822,
"openwebmath_perplexity": 1008.1600993666372,
"openwebmath_score": 0.6763939261436462,
... |
ros, microcontroller, hardware, arm-navigation
A valid URDF definition of your joints and actuators,
A bridge class that will own instances of:
A pr2::HardwareInterface
A pr2::ControllerManager
One pr2_hardware_interface::Actuator for each of your motors
A node for hardware communication that will own the bridge class... | {
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"tags": "ros, microcontroller, hardware, arm-navigation",
"url": null
} |
quantum-field-theory, renormalization, singularities, propagator
$$ M^2(p^2)\approx M^2(m^2)+ (p^2-m^2)\frac{dM^2(p^2)}{dp^2}\Big\vert_{p^2=m^2} + \text{Higher order terms} $$
Plugging this into the expression above,
\begin{gathered}
\frac{p^2-m_0^2-\left\{ M^2(m^2)-(p^2-m^2)\frac{dM^2(p^2)}{dp^2}\Big\vert_{p^2=m^2}\r... | {
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"tags": "quantum-field-theory, renormalization, singularities, propagator",
"url": null
} |
• universe=list,Array,DataFrame, inferred, or none
This option specifies the universal set of which the subsets S1,...,S5 are subsets. When universe is a specified as a container object, the size of this set minus all other provided sets is included in the generated diagram outside the regions representing each of the... | {
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"id": null,
"lm_label": "1. YES\n2. YES",
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"lm_q1_score": 0.9766692311915195,
"lm_q1q2_score": 0.8180776396810047,
"lm_q2_score": 0.8376199572530448,
"openwebmath_perplexity": 1441.9667149345526,
"openwebmath_score": 0.7398177981376648,
"tags":... |
python, python-3.x, http
Title: Reading and returning the HTML content from a specified URL I wanted to create a simple function that can read and return the HTML content from a specified URL. This is what reading here and there lead me to:
from socket import timeout
from urllib.request import Request, urlopen
from ur... | {
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"tags": "python, python-3.x, http",
"url": null
} |
java, primes, sieve-of-eratosthenes
/**
* @param args
* @throws IOException
*/
public static void main(String[] args) throws IOException {
int maxSize = 1;
int maxNumber;
int maxSearch;
int primeCount;
int maxPrime;
String name;
name = getTheMa... | {
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"tags": "java, primes, sieve-of-eratosthenes",
"url": null
} |
c#, beginner, console
string firstMeasure = AskForMeasureUnit();
Console.Write("Value in " + firstMeasure + ": ");
double measuredValue;
while (!double.TryParse(Console.ReadLine(), out measuredValue))
{
Console.WriteLine("This is not a number!");
Console.Write("... | {
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"tags": "c#, beginner, console",
"url": null
} |
ros, rosconsole, logging
Title: How to list available loggers?
I'm using a rosconsole.config file and the ROSCONSOLE_CONFIG_FILE environment variable to specify where it is, but is there any way to get a list of available loggers without having to run rqt_logger_level?
Thanks.
Originally posted by mikepurvis on ROS ... | {
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"tags": "ros, rosconsole, logging",
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} |
slam, navigation, ros-kinetic, ubuntu, gmapping
I noticed a couple of things in your launch file:
/odometry/filtered is a topic published by EKF Localisation and not a frame. Remapping it to /odom makes it available on the topic /odom which can be used by laser_scan_matcher.
You do not need these static transform publ... | {
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"tags": "slam, navigation, ros-kinetic, ubuntu, gmapping",
"url": null
} |
python, array
The second thing I would do is avoid slowly building arrays. You construct sub_array one element at a time as you go through the contiguous positive bit of the array. It would be more efficient to just store the start index and wait until the end of the contiguous positive bit of the array. To get it out... | {
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"tags": "python, array",
"url": null
} |
# Memoryless property: how does $P(X > s + t \mid X > s) = P(X > t), s, t \ge 0$ imply that $F^c(s + t) = F^c(s) F^c(t), s, t \ge 0$? [closed]
I am currently studying the textbook Modeling and analysis of stochastic systems, third edition, by Kulkarni. Chapter 5.1.1 Memoryless Property says the following:
We begin wi... | {
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"openwebmath_score": 0.9839485287666321,
"tags... |
java, beginner, mvc, javafx, crud
Title: JavaFX CRUD app for rescue animals I'm fairly new to Java, and I've been working on the following program. It's a basic CRUD app utilizing JavaFX and MVC design pattern. I'm seeking advice because the class I took on Java only covered the fundamentals of syntax. So I need to im... | {
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"tags": "java, beginner, mvc, javafx, crud",
"url": null
} |
r, dataframe, programming, dplyr
Title: Divide a column by itself with mutate_at dplyr Hi I'd like to turn each non zero value of my selected columns to a 1 using mutate_at()
BRAND MEDIA_TYPE INV1 INV2
<chr> <chr> <dbl> <dbl>
b1 newspapers 2 27
b1 magazines 3 ... | {
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Fastest algorithm would have a permutations of lengh k out of string ≤ 5 n is process! Of its permutations in strict lexicographical order, print all permutations of a string... Sees a mistake in my argumentation DSA concepts with the DSA Self Paced course at a time complexity of!. Early-Modern ( early 1700s European )... | {
"domain": "teknotasarim.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9489172688214137,
"lm_q1q2_score": 0.8046512511514057,
"lm_q2_score": 0.8479677602988602,
"openwebmath_perplexity": 919.4633298487723,
"openwebmath_score": 0.2735270857810974,
"tags... |
compactification, supergravity, calabi-yau, moduli
The simplest example to test your $\delta g_{mn}$ intuition is 1-complex-dimensional or 2-real-dimensional Calabi-Yaus, two-tori. The complex structure is changing the ratios of the two periods and the angle in between, namely the $\tau$ complex structure parameter. T... | {
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"openwebmath_score": null,
"tags": "compactification, supergravity, calabi-yau, moduli",
"url": null
} |
quantum-state, entanglement, bell-basis
Title: How are two-qubit states like $|00\rangle+|01\rangle+|10\rangle-|11\rangle$ related to entanglement? I've been going through different rotations of two-qubit states and noticed the states
$$
|00\rangle+|01\rangle+|10\rangle-|11\rangle\\
|00\rangle+|01\rangle-|10\rangle+|1... | {
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} |
The easy way to see that is to observe that the last four maps in your system map this square into four smaller squares that precisely tile the original square (and the first map just produces a square that redundantly overlaps the other four). Another, more rigorous way is to show that any point within this square (an... | {
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9796676419082933,
"lm_q1q2_score": 0.8421847540126272,
"lm_q2_score": 0.8596637451167997,
"openwebmath_perplexity": 298.8489057032838,
"openwebmath_score": 0.9700760245323181,
"tag... |
symmetry, representation-theory, lie-algebra
The fourth line, on the southern border, is the obvious isodoublet
$\bar u ss, \bar d ss$.
This comprises the 15 states of D(2,1). Y and I3 are motivated by strangeness physics, so the diamond is oriented "unnaturally", as you chose, and its origin for them is not a bar... | {
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"id": 87873,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "symmetry, representation-theory, lie-algebra",
"url": null
} |
general-relativity, gravity, speed-of-light, orbital-motion, faster-than-light
Cuckoo asked: So it appears that the force of gravity is indeed
directed towards the current orbital position of Earth, without
accounting for the delay caused by the speed of light. How is this
possible? | {
"domain": "physics.stackexchange",
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"tags": "general-relativity, gravity, speed-of-light, orbital-motion, faster-than-light",
... |
graphs, clique
As you can see in the previous picture, this is a clique on four vertices $\{{1,2,3,4}\}$, so there is a different edge connecting every edge (i.e. $(1,2)$,$(1,3)$,$(1,4)$,$(2,3)$,$(2,4)$,$(3,4)$).
You can count them and see that there are exactly $6 = \frac{4\times 3}{2}$ edges. | {
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"tags": "graphs, clique",
"url": null
} |
ruby, weekend-challenge, playing-cards
Depending on context of use, an additional sanity check may also be necessary: Check if you really receive 5 instances of Card.
The following points are suggestions where you could go from here
Make Hand a subclass of Array
A hand of cards is also an array of cards - The resemb... | {
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"openwebmath_score": null,
"tags": "ruby, weekend-challenge, playing-cards",
"url": null
} |
ros, moveit
Yes exactly that's what I'm doing !
I have 3D model of my robot working in Staubli studio so I have all details about it.
But how can I use or edit your package !?
Comment by gvdhoorn on 2014-11-19:
You could use the RX160 urdf as a template, but update the joint transforms with the data for your particula... | {
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"tags": "ros, moveit",
"url": null
} |
and
Multiplication
Multiplication
Multiplication is the mathematical operation of scaling one number by another. It is one of the four basic operations in elementary arithmetic ....
and division
Division (mathematics)
right|thumb|200px|20 \div 4=5In mathematics, especially in elementary arithmetic, division is an ari... | {
"domain": "absoluteastronomy.com",
"id": null,
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"lm_q2_score": 0.8152324938410784,
"openwebmath_perplexity": 1031.2519248911933,
"openwebmath_score": 0.8309186697006226,
... |
mechanisms, terminology
The assembly is made up of an "adjusting bolt":
The "neck" on the adjusting bolt, noted with dimension "T" above, sits in a "block for adjusting bolts":
The block wraps around the "neck" of the adjusting bolt, such that the bottom of the hex head cap is on one side of it and the top of the ... | {
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"id": 2577,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "mechanisms, terminology",
"url": null
} |
hamiltonian, fermions, tight-binding
Title: Is the tight binding model an effective free fermion model? The tight-binding Hamiltionian has the form
$$H=-t\sum_i\left(c_i^\dagger c_{i+1} + c_{i}c_{i+1}^\dagger\right)$$
But does this mean that it can be represented in the form of free fermion modes? It is a free fermion... | {
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"openwebmath_score": null,
"tags": "hamiltonian, fermions, tight-binding",
"url": null
} |
reinforcement-learning, algorithm-request, monte-carlo-methods, temporal-difference-methods
Title: Given a set of trajectories produced by a fixed policy, what is the the standard approach to estimate Q? Let's say that I have a set of trajectories $\mathcal{D} = \{\tau_1, \dots, \tau_n\}$ produced by an agent acting i... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "reinforcement-learning, algorithm-request, monte-carlo-methods, temporal-difference-meth... |
c++, multithreading, c++17, callback, c++20
There’s one style issue I’d like to critique, then I’d like to discuss your design. So this will be more of an overall design review than a specifically-code review.
Style issue: naming convetions
On the style front, I find your choice to mangle member function arguments… bu... | {
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"openwebmath_score": null,
"tags": "c++, multithreading, c++17, callback, c++20",
"url": null
} |
java
}
This code works, however I'd like feedback on anyways that I can improve the code as I am just a graduate. I want to mention only one thing especially:
You're using "magic string" to choose your filter types. Instead of doing that (because it's brittle) you are probably better off with an enum:
public enum Fil... | {
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"tags": "java",
"url": null
} |
frequency, equalizer
Searching for “Q-factor for low-shelf filter” leads to Calculate Q factor of a Low Shelf and High Shelf filter on this very site. This question can be closed as a duplicate.
Formulas for shelf filters can be found at https://www.w3.org/TR/audio-eq-cookbook/:
$$
\frac 1 Q = \sqrt{\left(A + \frac 1 ... | {
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"openwebmath_score": null,
"tags": "frequency, equalizer",
"url": null
} |
thermodynamics, temperature, entropy
Title: How does entropy work with mixing? Imagine a hypothetical box filled with water, with two equal-volume partitioned sections: one at 40 degrees, and the other at 60 degrees. There is thus an energy associated with the difference in temperature that could be harnessed.
In this... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "thermodynamics, temperature, entropy",
"url": null
} |
homework-and-exercises, electromagnetic-radiation, photons, momentum, thermal-radiation
Title: Force of photons from the Sun hitting a football field = weight of 1 dime? I read, I think, some time ago that the "weight" of photons from the Sun hitting an area the size of a football field at noon on a sunny day would be... | {
"domain": "physics.stackexchange",
"id": 85212,
"lm_label": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "homework-and-exercises, electromagnetic-radiation, photons, momentum, thermal-radi... |
video-processing, camera, measurement
Title: Accurate measurement of object's position on a bayer-filtered and grayscaled images This is an experience-related question about cameras and image processing.
I have a laboratory setup. Under some simplifications it looks like a red ball rolling on a white table (the real s... | {
"domain": "dsp.stackexchange",
"id": 3054,
"lm_label": null,
"lm_name": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "video-processing, camera, measurement",
"url": null
} |
openi-tracker
Title: Openni_tracker question
http://www.ros.org/wiki/openni_tracker
How do I bring up the Prime Sense User Tracker viewer? I ran rosrun openni_tracker openni_tracker and it looks like it published to /tf.
Originally posted by punching on ROS Answers with karma: 78 on 2012-07-18
Post score: 0
Hi,
It ... | {
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"id": 10268,
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"tags": "openi-tracker",
"url": null
} |
beginner, rust
fn get_row_and_column() -> Result<(usize, usize), ()> {
let strings = match read_row_and_column_strings() {
Ok(strings) => strings,
Err(_) => return Err(()),
};
let numbers = match parse_row_and_column_strings(strings) {
Ok(numbers) => numbers,
Err(_) => retu... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "beginner, rust",
"url": null
} |
physical-chemistry, fluorescence
The total emission is $\displaystyle F=I_O(1-\alpha)+I_D\alpha=I_O\frac{1}{1+K}+I_D\frac{K}{1+K}$
Rearranging this gives $\displaystyle \frac{1}{I_O+KI_D}+\frac{1}{I_D}=\frac{1}{F}$
Replacing intensity with product of fluorescence yield and concentration and using the rather odd defini... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "physical-chemistry, fluorescence",
"url": null
} |
homework, atoms, electrons
A one electron species initially in some excited state $n_i$ is
irradiated with a light of wavelength 121 nm when the electron is
promoted to a further higher orbit $n_f$. In returning back to the
ground state, it gives an emission spectrum containing 15 bright
lines. Out of these 15... | {
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"tags": "homework, atoms, electrons",
"url": null
} |
java, object-oriented
for (int i = 0;i<library[selectedBook].getEntries();i++){
System.out.println("===========Entry "+i+" ===========");
library[selectedBook].contents[i].readEntry(); //Accessing the array of entries INSIDE the array of books/the library
System.out.prin... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "java, object-oriented",
"url": null
} |
objective-c, ios
return cell;
}
- (void)displayBlockedUsers
{
if (self.isShowingBlocked == YES)
{
self.isShowingBlocked = NO;
[self.tableView reloadSections:[NSIndexSet indexSetWithIndex:2] withRowAnimation:UITableViewRowAnimationNone];
}
else
{
self.isShowingBlocked = YES;... | {
"domain": "codereview.stackexchange",
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"tags": "objective-c, ios",
"url": null
} |
fit or do you use other functions? y is the data set whose values are the vertical coordinates. In this example, one of the fundamental assumptions of simple regression analysis is violated, and you need another approach to estimate the relationship between X and Y. I would like to know what is the best way to explain ... | {
"domain": "com.br",
"id": null,
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9591542864252023,
"lm_q1q2_score": 0.817154180037163,
"lm_q2_score": 0.8519528000888386,
"openwebmath_perplexity": 780.896761508947,
"openwebmath_score": 0.2882913053035736,
"tags": null,
"... |
python
There are also several parts of the code that just seem hacky and bad practice. Also, if you use Python 3.5+, you can use glob instead of your custom locate function. In the spirit of reviewing all your code anyway and making any suggestions that seem appropriate, here's how I'd suggest your code be written, th... | {
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"openwebmath_score": null,
"tags": "python",
"url": null
} |
homework-and-exercises, photons, momentum, conservation-laws, reflection
Now, in the solution the question has been solved by equating the change in momentum of the photons to the change in momentum of the mirror. However, what escapes me is how does the mirror move at all if all the photons are being reflected perfec... | {
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"tags": "homework-and-exercises, photons, momentum, conservation-laws, reflection",
"url"... |
general-relativity, black-holes, event-horizon, singularities, hawking-radiation
Also, black holes evaporate, which may lead to some caveats about the previous two statements (which do not take evaporation into account).
So suppose we have a large black hole, destined to evaporate and vanish in the the year 1050 AD. A... | {
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"id": 91053,
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"tags": "general-relativity, black-holes, event-horizon, singularities, hawking-radiation",... |
hector
Original comments
Comment by zero1985 on 2014-01-27:
thank you for the answer, I have already updated my question and also provided information on my launch file.
Comment by zero1985 on 2014-02-10:
thanks for the reply. The parameter setting if I remember correctly is refer to some post in ros answer but I coul... | {
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"tags": "hector",
"url": null
} |
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