text stringlengths 1 1.11k | source dict |
|---|---|
c++, logging, c++17, macros
Compiler Explorer link Looking at the code, it is clear that you took a part from existing C code.
Overal the code is acceptable, although when I should accept it, I would recommend some changes.
As already indicated in another answer, you could use scoped enums. This would remove the L_ pr... | {
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"tags": "c++, logging, c++17, macros",
"url": null
} |
$$P_3 = 2P_2 = 2$$ $$P_4 = 2*2\\ \vdots\\ P_n = 2^{n-2}$$
Which is inconsistent with the $n$-combination solution to solve this. Where did I get it wrong??
• starting with n = 2 there is exactly 1 string containing 01. Then for any n > 1 denote the number of such strings as $a_{n}$ then the number without 01 will be ... | {
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"lm_q2_score": 0.8397339596505965,
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"openwebmath_score": 0.917699933052063,
"tag... |
neural-network
Hence
$$f_2(x) = \max(0, x) - \alpha \max(0, -x)$$
Question
Did I get something wrong? Aren't $f_1$ and $f_2$ equivalent to $f$ (assuming $\alpha \in (0, 1)$?) Straight from wikipedia:
Leaky ReLUs allow a small, non-zero gradient when the unit is not active.
Parametric ReLUs take this idea further by m... | {
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"tags": "neural-network",
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} |
ros
rosrun rviz rviz -d 'rospack find turtlebot_navigation` /nav_rviz.vcg.
Thus, do you have any idea how to overcome this issue?
best wishes
Azizi. | {
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"tags": "ros",
"url": null
} |
c#, wpf, mvvm, databinding
Usage
View Registration
var dataGrid = new MyDataGrid(); // implements: IDataGridAbstractionForViewModel
ViewConnector<IDataGridAbstractionForViewModel>.Register(dataGrid);
ViewModel Implementaion
public class DataGridViewModel : ViewModelBase, IViewAwareViewModel<IDataGridAbstractionForVie... | {
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"tags": "c#, wpf, mvvm, databinding",
"url": null
} |
c++, memory-management, raii
// Like your file helper this is a waste of time.
// And a bad idea as it stops the system from helping you
// debug.
arr = NULL;
}
}
I would break the reallocation part of this function into its own named function. That will make your code ... | {
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"tags": "c++, memory-management, raii",
"url": null
} |
bash, linux, shell
Device Bay: 7
Discovered: No
Firmware Component Current Version Firmware ISO Version
------------------------------------ -------------------- ---------------------
System ROM I36 09/12/2016
iLO4 2.50 Sep 23 20... | {
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"tags": "bash, linux, shell",
"url": null
} |
height. Not sure what college you want to attend yet? The altitude (or height) of a parallelogram is the perpendicular distance from the base to the opposite side (which may have to be extended). The area of a parallelogram is equal to … The architect is thrilled that his building will be classified as a skyscraper sin... | {
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9787126531738087,
"lm_q1q2_score": 0.8667787235660888,
"lm_q2_score": 0.8856314677809303,
"openwebmath_perplexity": 1772.1875258555697,
"openwebmath_score": 0.33080369234085083,
"... |
Convert the following second-order differential equation to a system of first-order differential equations by using odeToVectorField.
$\frac{{\mathit{d}}^{2}\mathit{y}}{\mathit{d}{\mathit{t}}^{2}}=\left(1-{\mathit{y}}^{2}\right)\frac{\mathit{dy}}{\mathit{dt}}-\mathit{y}.$
syms y(t)
eqn = diff(y,2) == (1-y^2)*diff(y)-... | {
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9828232924970204,
"lm_q1q2_score": 0.848561381374031,
"lm_q2_score": 0.8633916064586998,
"openwebmath_perplexity": 1733.3213692547977,
"openwebmath_score": 0.6988626718521118,
"tags": ... |
or decreases without bound the end behavior of =. Places where the behavior of f ( x ) as x increases or decreases without bound consider the limit y... =0$ ) determined by the degree and the leading coefficient to determine the of! There is a horizontal asymptote y = 2 as x approaches negative.. | {
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9766692318706085,
"lm_q1q2_score": 0.8262059542461945,
"lm_q2_score": 0.8459424411924673,
"openwebmath_perplexity": 484.2146184988172,
"openwebmath_score": 0.7733432054519653,
"tags"... |
The observations you apply your tests to (some form of residuals) aren't independent, so the usual statistics don't have the correct distribution. acceptable deviation from the normal line. Solution We apply the lm function to a formula that describes the variable eruptions by the variable waiting , and save the linear... | {
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"lm_q1_score": 0.9449947117065458,
"lm_q1q2_score": 0.8159005005744241,
"lm_q2_score": 0.8633916047011594,
"openwebmath_perplexity": 1563.9871741379889,
"openwebmath_score": 0.4371911287307739,
"tags": null,
... |
ros, laserscanner, topic, scan
Title: Using subscriber to subscribe the Lidar's signal Topic
Hello ROS users,
I am using a subscriber to subscribe lidar's signal. I have watched the subscriber and publisher example(C++) tutorial's video and use catkin_ws to build a package, and I make a sick_listen roscpp file which ... | {
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"tags": "ros, laserscanner, topic, scan",
"url": null
} |
ros, matlab, gazebo, simulation, stage
Title: Stage vs Gazebo
Hi Users:
I would like to know the pros and cons between Stage and Gazebo. Is there any document where I can find out?
Thanks!!!
Originally posted by Alvaro Salcedo on ROS Answers with karma: 149 on 2015-06-15
Post score: 5
Stage is a 2D simulator and Ga... | {
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"tags": "ros, matlab, gazebo, simulation, stage",
"url": null
} |
c++, design-patterns, abstract-factory
In the real world, any class hierarchy complex enough that you’d really need this will need a non-trivial destructor. This would include, for example, any factory object that uses dynamic memory to manage what kind of windows and doors it creates. This will not get called unles... | {
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"tags": "c++, design-patterns, abstract-factory",
"url": null
} |
quantum-field-theory, symmetry, definition, feynman-diagrams
Title: Definition and proof of Symmetry Factor of Feynman Diagram Studying QFT, I was told that symmetry factor is defined by:
if there are $m$ ways of arranging vertices and propagators to give identical parts of a diagram (keeping the outer ends of extern... | {
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"tags": "quantum-field-theory, symmetry, definition, feynman-diagrams",
"url": null
} |
angular-momentum
Would be great if your answer would contain some formulas and approximations which estimate the orders of magnitudes in those problems. The effect you describe is called engine torque or propeller torque. All that happens is that the pilot opposes this torque with aileron in the opposite direction. ... | {
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python, performance
OS: Linux Mint 21.2 x86_64
Host: VMware Virtual Platform None
Kernel: 5.15.0-76-generic
CPU: Intel i5-8350U (2) @ 1.896GHz
GPU: 00:0f.0 VMware SVGA II Adapter
Memory: 716MiB / 1929MiB
$ wc bible.txt
99809 821115 4432263 bible.txt
$ time ./wordlist.py < bible.txt
...
..
.
real 33m31.760... | {
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"tags": "python, performance",
"url": null
} |
quantum-mechanics
What is the correct interpretation (e.g. Copenhagen, Many-Worlds, etc...) of quantum mechanics? This question might never be answered, and indeed might not be a meaningful question, but it is also possible that it is a meaningful question, and might be answered in the future by new data that takes th... | {
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r, python, biopython
if seq_feature.location.strand == -1:
complement = str(seq_feature.location).strip('[]').split('(-)')[0]
pippo = SeqRecord(
Seq(seq_feature.qualifi... | {
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"id": 1985,
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"tags": "r, python, biopython",
"url": null
} |
javascript, promise
// Array.isArray polyfill
if (!Array.isArray) {
Array.isArray = function(arg) {
return Object.prototype.toString.call(arg) === '[object Array]';
};
}
Working demo: https://jsfiddle.net/jfriend00/om5auzs0/ | {
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"openwebmath_score": null,
"tags": "javascript, promise",
"url": null
} |
ros, ros-kinetic, image-proc
Title: example for setting destination width and height and getting updated camera info when using image_proc/resize
Hey, could someone please give me a concrete example about how to use the resize() function via command line?
This link seems to be promising, but it doesn't show how to se... | {
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"tags": "ros, ros-kinetic, image-proc",
"url": null
} |
algorithms, fast-fourier-transform
Title: Multiplying two bivariate polynomials using FFT
Consider two bivariate polynomials of degree at most $n − 1$ in each variable:
$$
F(x,y) = \sum_{i,j=0}^{n-1} f_{i,j} x^iy^j \quad\text{and}\quad G(x,y) = \sum_{i,j=0}^{n-1} g_{i,j} x^iy^j
$$
Show how to compute the product poly... | {
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"openwebmath_score": null,
"tags": "algorithms, fast-fourier-transform",
"url": null
} |
quantum-field-theory, field-theory, classical-field-theory
Title: Is there an equivalent term in the lagrangian of classical newtonian physics to the corresponding $\frac{1}{2}m^2\phi^2$ term of QFT? In classical field theory and quantum field theory, the lagrangian could have a mass term in the form: $\frac{1}{2}m^2\... | {
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"tags": "quantum-field-theory, field-theory, classical-field-theory",
"url": null
} |
-
$\quad$:+)$\quad$ – amWhy Mar 13 '13 at 0:58
Look at the integral $$\int 2x^2e^{x^2}\, dx.$$ Try integrating by parts as follows. $u = x$, $dv = 2xe^{x^2}dx$, $v = e^{x^2}$, $du = dx$. | {
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"lm_q1q2_score": 0.8152081607199556,
"lm_q2_score": 0.8418256492357358,
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"openwebmath_score": 0.9999493360519409,
"tag... |
quantum-mechanics, observers, quantum-measurements
Title: Formalization (and meaning) of "Heisenberg Cut" In discussions around a recent Stack answer in What does John Conway and Simon Kochen's "Free Will" Theorem mean? which covered axiomatic quantum mechanics, Bell's Theorem and Random Fields (related to axiomatic Q... | {
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"tags": "quantum-mechanics, observers, quantum-measurements",
"url": null
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thermodynamics
See figure below.
200 Bar and h = 2353 puts point 2 in the two-phase region.
From point 1 to point 1A you can use specific heat to calculate enthalpy change. From point 1A to 2 you have liquid and vapor at constant temperature. The change in enthalpy (527) is entirely due to the heat of vaporization. ... | {
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"tags": "thermodynamics",
"url": null
} |
python, beginner, python-2.x, rock-paper-scissors
print computer_choosed
if user_choice == computer_choice:
assert result == 0
print "So it's a tie"
else:
win = False # unused value
if user_choice == 'stone':
win = (computer_choice == 'scissor')
elif user_c... | {
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"url": null
} |
quantum-mechanics, quantum-field-theory, condensed-matter, perturbation-theory, greens-functions
where $V$ is the small interaction part of the Hamilton operator $H=H_0+V$ and $T$ is the time-ordering operator (for more see Wikipedia or QFT textbooks).
Each term of this series can be represented by a Feynman-diagram. ... | {
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"tags": "quantum-mechanics, quantum-field-theory, condensed-matter, perturbation-theory, gr... |
python, python-2.x, file, io
return content
Please take note of the commented out code using with. I really wanted to use with but I can't find any good resource on how to catch exceptions with with. So I did it using try except.
Question: Is there no better way to do this? Or any comments?
P.S. I come from a Java ba... | {
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"openwebmath_score": null,
"tags": "python, python-2.x, file, io",
"url": null
} |
control, ros, real-time
Title: Why control at 1 kHz?
Hello!
Is there a reason for the 1 kHz control frequency discussed here in ROS-Users and again in the TRO paper Human-Inspired Robotic Grasp Control with Tactile Sensing
Is this a bound related to the selected (computer) architectures?
More specifically, if control... | {
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"tags": "control, ros, real-time",
"url": null
} |
neuroscience, measurement
Title: How are individual neuron firing rates characterized? I'm reading this paper that the Human Brain Project published in Cell and I'm confused how they recorded the firing rates shown in the firing below: | {
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"openwebmath_score": null,
"tags": "neuroscience, measurement",
"url": null
} |
general-relativity, gravity, speed-of-light, acceleration, faster-than-light
Title: Why can't gravity force an object past the speed of light? I hope this question is not a duplicate (it doesn't seem to be) and that it is appropriate for this site.
If we had a universe with only two bodies. One is ultra massive, and t... | {
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"tags": "general-relativity, gravity, speed-of-light, acceleration, faster-than-light",
"... |
For the induction hypothesis, assume that $\displaystyle \prod^n \mathbb{N}$ is countable. Now we just need to show that $\displaystyle \prod^{n+1} \mathbb{N}$ is countable. First, note that can write the $(n\!+\!1)$-fold product in the form $\mathbb{N} \times \left( \displaystyle \prod^n \mathbb{N} \right)$. A bijecti... | {
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9787126525529014,
"lm_q1q2_score": 0.8537774178909653,
"lm_q2_score": 0.8723473796562744,
"openwebmath_perplexity": 195.1127876307063,
"openwebmath_score": 0.8474349975585938,
"tag... |
javascript, ecmascript-6, event-handling, dom, animation
<img class="swiper__contents__component" src="../images/photo-irene7.jpg" alt="아이린">
</div>
</div>
</div>
</div>
<div class="swiper__title">
<h2>IRENE</h2>
</div>
</div>
</section>
... | {
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"tags": "javascript, ecmascript-6, event-handling, dom, animation",
"url": null
} |
c, generics, stack
/* To use, do this:
* #define STACK_IMPLEMENTATION
* before you include this file in *one* C file to create the implementation.
*
* i.e. it should look like:
* #include ...
* #include ...
*
* #define STACK_IMPLEMENTATION
* #include "stack.h"
* ...
*
* To make all the functions have inte... | {
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"tags": "c, generics, stack",
"url": null
} |
quantum-mechanics, condensed-matter, physical-chemistry, quantum-chemistry
$$
Projecting $|\Phi_{p_1p_2...p_N}\rangle$ with
$$
|x_1,x_2,...,x_N\rangle=|x_1\rangle\otimes|x_2\rangle\otimes...\otimes|x_N\rangle
$$
will similarly pick out a single one from the $2^N$ spinor components:
$$
\Phi_{p_1p_2...p_N}(x_1,x_2,...,x... | {
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"ur... |
c#, performance, file-system, asp.net-web-api
_currentId++;
DirectoryInfo dInfo = new DirectoryInfo(serverPath);
foreach (FileInfo file in dInfo.GetFiles())
{
node.Files.Add(new FileObject
{
Name = file.Name,
Size = String.Format("{0:n0}"... | {
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"openwebmath_score": null,
"tags": "c#, performance, file-system, asp.net-web-api",
"url": null
} |
linear-regression
Linear regression is really just finding a line (or plain or hyperplain) that maps a relationship between two or more variables or features. The important requirement is that the target variable be a continuous numerical value. So its less about finding a problem for which linear regression "works"... | {
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"tags": "linear-regression",
"url": null
} |
always give the remainder of a division is a very small negative number learn share. Into your RSS reader package with a.whl file the C++ / operator ( type! Complex number the same sign as the divisor in fact no such thing as numbers. Positive number, e.g that you have already resolved your concern a long time )! Mod z... | {
"domain": "distriktslakaren.se",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9653811611608242,
"lm_q1q2_score": 0.8843949708091763,
"lm_q2_score": 0.9161096221783882,
"openwebmath_perplexity": 1372.441624422156,
"openwebmath_score": 0.5023279190063477,
"t... |
quantum-mechanics, classical-mechanics, energy, schroedinger-equation, potential-energy
Title: Classical analog of the statement "$E$ must exceed the minimum value of $V(x)$ Overall question:
Griffiths problem 2.2 states that $E$ must exceed the minimum value of $V(x)$ for every normalizable solution to the time-indep... | {
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"tags": "quantum-mechanics, classical-mechanics, energy, schroedinger-equation, potential-e... |
a matrix of size m n, then its transpose AT is a matrix of size n m. Identity matrix: I n is the n n identity matrix; its diagonal elements are equal to 1 and its o diagonal elements are equal to 0. The result depends on rule parameter. Matrix Transpose. And that first row there is now going to become the first column.... | {
"domain": "ask-casino.com",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9678992895791291,
"lm_q1q2_score": 0.8168054626418185,
"lm_q2_score": 0.8438950947024555,
"openwebmath_perplexity": 710.2016261906842,
"openwebmath_score": 0.6792985200881958,
"ta... |
lowpass-filter, finite-impulse-response
result <= (OTHERS => '0'); --clear result output
ELSIF(clk'EVENT AND clk = '1') THEN --not reset
coeff_int <= coefficients; --... | {
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"tags": "lowpass-filter, finite-impulse-response",
"url": null
} |
special-relativity, inertial-frames
The Twin Paradox is the attempt to dispute the Clock Effect by analyzing the problem from the viewpoint of the non-inertial worldline with the hope of obtaining the same conclusions as gotten from the viewpoint of the inertial worldline... thus nullifying the effect, resulting in no... | {
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"tags": "special-relativity, inertial-frames",
"url": null
} |
qiskit, quantum-gate, pauli-gates, hamiltonian
$$ H_{\text{sys}} = \sum_{i} \epsilon_i c_{i }^{\dagger} c_{i } + t \sum_{i } (c_{i}^\dagger c_{i+1 } + c_{i+1}^\dagger c_{i } ) $$
This is the expression of the transformed Hamiltonian :
$$ H_{\text{sys}} = \sum _{k=1}^{N} \textbf{I}^{\otimes (k-1)} \otimes \epsilon _k \... | {
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"tags": "qiskit, quantum-gate, pauli-gates, hamiltonian",
"url": null
} |
c++, beginner, windows, library
I'm using Visual Studio 2019 Professional
Include Guards
I'm assuming this library is a header file because of the include guards. In C++ use either #pragma once or #ifndef but you don't need both. I prefer #ifndef because it may be more portable, not all C++ compilers support #pragma o... | {
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"tags": "c++, beginner, windows, library",
"url": null
} |
python, python-3.x, console, shell
break
if suggestion == "3":
num1 = int(input("Enter a number: "))
num2 = int(input("Enter a number: "))
print ("Please wait...")
time.sleep(0.6)
answer = num1*num2
print ("Your answer is:")
print (answer)
b... | {
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"tags": "python, python-3.x, console, shell",
"url": null
} |
ruby
html_body = $EMBED_HTML.gsub($SAMPLE_FLV, flv_filename.sub(/[a-z][:]/, ''))
html_output = File.open(html_filename, "w")
html_output.write(html_body)
html_output.close
link = flv_filename.sub(/[a-z][:]/, '').gsub(".flv", ".html")
link_list = File.open("#{output_folder}List of Links.txt", "a")
link_li... | {
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"openwebmath_score": null,
"tags": "ruby",
"url": null
} |
quantum-spin
Title: Does spin-orbit coupling make the Hamiltonian unbounded below? I am reviewing properties of atoms and I find myself becoming uncomfortable with spin orbit coupling. For ease, let's consider the case of hydrogen. In particular, at very small $r$,
$$H_{\mathrm{SO}} = \frac{c}{r^3} \vec{S}\cdot \vec{L... | {
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"url": null
} |
bed, exome
However make sure that you are correctly using the right file and that you report (or record) each version of protocol and data used in case some doubts arise. | {
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java, algorithm, strings, complexity
private void addScoreIndex(int index){
if(scoreIndexes == null) scoreIndexes = new int[1];
else scoreIndexes = Arrays.copyOf(scoreIndexes, scoreIndexes.length + 1);
scoreIndexes[scoreIndexes.length - 1] = index;
}
} I solved my problem, the trick was to ... | {
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"url": null
} |
c#
At the end you have
else if (paymentAuto.PaymentType == PaymentMethod.PayPalExpress)
{
paymentOptions = **new PaypalOptions()**;
}
else
{
paymentOptions = **new PaypalOptions()**;
}
This returns the same PaymentOption. So it would be better to remove the last else if statement.
paymentAuto can be null in ... | {
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"tags": "c#",
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} |
c++, c++11, boost
On implicit conversions: I wanted to allow conversions, but prefer them to be explicit. This could be made configurable but I don't think it is worth the trouble.
Some examples of usage:
Example 1: disabling implicit conversions
int a{2};
long b{3};
b = a; // works: the implicit conversion is safe
... | {
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The matrix $A$ is nilpotent with characteristic polynomial $x^2.$ But by definition $x^2 = \det(A - xI).$ If we let $x = -1,$ then we have $\det(A + I) = 1.$
-
This is the simplest way. Than you for help – Argha Aug 2 '12 at 14:16
$A$ is similar to (and hence has the same determinant as) a matrix of the form $\begin{... | {
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"ta... |
Yes, you are missing something and I get the given answer. But this is a "homework" problem, so hints only.
The wording of the question is important. For instance the magnitude of the average velocity vector over 60 seconds would be exactly zero. Or to put it another way, if I travel at constant speed to a point, and ... | {
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"lm_q2_score": 0.8705972684083609,
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"openwebmath_score": 0.9226682782173157,
"ta... |
ros, baxter
Originally posted by Zero on ROS Answers with karma: 104 on 2016-06-16
Post score: 0
In the ik_request(), I can understand this function's main function was calling the IK server to calculate the rest of the joints angle after that return back. But what is the purpose in line 100 (What is doing in here?)... | {
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Some authors allow a more general definition where Hom(A,B) is indeed allowed to be a class. These authors refer to categories where Hom(A,B) is always a set, as locally small categories. -- Fropuff 20:34, 7 March 2006 (UTC)
Ah i was not aware of that. But, if indeed Hom(A,B) is allowed to be large classes, how then c... | {
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"tags":... |
-
We will assume that $n>4$, since $4\hspace{-3pt}\not|\,3!$.
Let $p$ be the smallest factor of $n$. Since $n$ is composite, $p\le\sqrt{n}$.
If $p=\sqrt{n}$, then since $n>4$, we must have $p>2$ so that $2p<p^2=n$. Thus, $p\le n-1$ and $2p\le n-1$, and therefore, $2n=p\cdot2p\,|\,(n-1)!$
If $p<\sqrt{n}$, then $n/p>... | {
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"openwebmath_score": 0.9628010988235474,
"ta... |
c++, performance, object-oriented, strings
Title: Mixed Duo String Generator I've create a program that finds mixed duo within a string. It removes characters from a string that do not form the first mixed duo. It does not rearrange the order of the string, it ony remove characters to reveal the mixed duo...... aka "a... | {
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"tags": "c++, performance, object-oriented, strings",
"url": null
} |
scheme
If you cannot use the predefined function, then you could define reverse as:
(define reverse
(lambda (ls)
(if (null? ls)
'()
(append (reverse (cdr ls)) (cons (car ls) '())))))
or, with a tail-recursive definition, like in:
(define reverse
(lambda (ls)
(define reverse1
(lambda ... | {
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quantum-field-theory, electromagnetism, special-relativity, gauge-invariance
Title: Local gauge invariance and fields I have one question about local gauge invariance of the spinor and scalar theories.
For the scalar complex field with lagrangian $L_{0}$ requirement of local gauge invariance leads us to the Lagrangian... | {
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"tags": "quantum-field-theory, electromagnetism, special-relativity, gauge-invariance",
"u... |
homework-and-exercises, electric-circuits, electric-current, electrical-resistance
"Three resistors are connected as shown. What is the total resistance between $X$ and $Y$?"
Again, I don't really need help with understanding the theory but more so, understanding what I'm supposed to find in the end. Am I supposed to... | {
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"tags": "homework-and-exercises, electric-circuits, electric-current, electrical-resistance... |
a similar meaning, but the magnitude of the number is a little different. Plotting polar images in Matlab I'm currently working with ultrasound images acquired on a polar grid, with equispaced range and angle values. the angle of the satellite to the center of the planet % epsilon -- the value that elongates the orbit ... | {
"domain": "limbury.de",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9869795114181106,
"lm_q1q2_score": 0.8246051312267167,
"lm_q2_score": 0.8354835350552604,
"openwebmath_perplexity": 960.1824974765693,
"openwebmath_score": 0.8298311829566956,
"tags": nul... |
textbook-and-exercises, density-matrix
Now, performing a measurement with respect to the operator $\rho$ on a qubit in the state $\lvert\psi\rangle$ is almost like performing a full measurement with respect to the basis $\{\lvert u_i\rangle\}$, except that there's a possibility of some of the probabilities $\lambda_i$... | {
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"tags": "textbook-and-exercises, density-matrix",
"url": null
} |
heat equation. Known temperature boundary condition specifies a known value of temperature T 0 at the vertex or at the edge of the model (for example on a liquid-cooled surface). So I wrote this piece of code for solving a system of linear equations using Gauss-Seidel’s Iterative method in the fifth semester of my unde... | {
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"lm_q1_score": 0.9777138157595306,
"lm_q1q2_score": 0.8038656656888873,
"lm_q2_score": 0.8221891239865619,
"openwebmath_perplexity": 740.6640522590636,
"openwebmath_score": 0.5107588171958923,
"tags": null,
... |
terminology-and-notation, bloch-sphere
Title: What is the meaning of writing a state in its Bloch representation? What is the meaning of writing a state $|\psi\rangle$ in its Bloch representation. Would I be correct in saying it's just writing out its Bloch vector? Yes. The Bloch sphere formalism is used for geometric... | {
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"tags": "terminology-and-notation, bloch-sphere",
"url": null
} |
image-processing, noise
Notice how the image has both black and white salting.
Running both an opening and closing algorithm (OpenCV) on this penguin, we remove the black and white salts, and get a nice, smoother image without the spots:
Also, here is my OpenCV code that does this:
#include "opencv2/highgui/highgui.h... | {
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"tags": "image-processing, noise",
"url": null
} |
energy, space, solar-cells
To put it into context, Mercury (the approximate location of a dyson swarm) receives $9116.4\ \mathrm{W/m^2}$ of light energy, and assuming 5,000 satellites each of $1\mathrm{\ km^2}$ size, that would be a concentration of 45,582,000,000,000 watts (45 trillion watts) on a very small area. Gi... | {
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"openwebmath_score": null,
"tags": "energy, space, solar-cells",
"url": null
} |
c#, tcp, async-await
// sends output to client
public void send(List<byte[]> output)
{
output.ForEach((message) => {
_stream.Write(message, 0, message.Length);
});
}
// dergisters the user from the room and closes stream and connection
private void cleanUp()
{
... | {
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"tags": "c#, tcp, async-await",
"url": null
} |
program-analysis, correctness
Can D correctly simulated by H terminate normally?
The x86utm operating system based on an open source x86 emulator. This system enables one C function to execute another C function in debug step mode. When H simulates D it creates a separate process context for D with its own memory, sta... | {
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"tags": "program-analysis, correctness",
"url": null
} |
For the function $x = 2 ln(y-3)$, the slope at (0,4) must be the same, no matter how that slope is calculated. If you get a different looking answer while using correct manipulations, the final answers must be equivalent.
### Another Example
A similar question appeared on the AP Calculus email list-server almost a d... | {
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"tags": ... |
java, cryptography
import java.security.SecureRandom;
import java.util.List;
import java.util.ArrayList;
import java.math.BigInteger;
public class PreCrypt {
// Remove Constructor
private PreCrypt() {}
/**
* Default Charset which contains only default Characters.<br/>
* Supports: a-z, A-Z, 0-9... | {
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"url": null
} |
design-patterns, mvc, objective-c
PFInstallation *installation = [PFInstallation currentInstallation];
NSArray *foodList = (NSArray*)[installation objectForKey:@"favorites"];
return ([foodList containsObject:foodName]);
}
- (void)changeStarToState:(StarState)state{
NSString *imgName;
if (state == Stat... | {
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} |
acoustics, diffraction
Title: Hearing sound around corners I've been taught that diffraction is the reason why we can hear around corners, since the wavelength of sound is approximately 10 cm (smaller than a door or a window).
I wonder how can this be correct, since I can hear even when a room is closed (walls are not... | {
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programming-challenge, rust
Here I've also used a byte character literal, rather than casting to u8, which clippy will warn you about. With a known constant, it's safe, but then you should just use the byte literal.
What this says is to, for each position in content, take the thing at the position *byte, and decrement... | {
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python, opencv, rospy
Original comments
Comment by ahendrix on 2017-03-20:
If this is just showing the first image and then freezing, maybe you should remove the cv2.waitKey() ?
Comment by UllusParvus on 2017-03-21:
I have to correct, it s not showing the first image, the window is freezing instantly after popping up ... | {
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java, programming-challenge, multithreading, finance
public synchronized void deposit(Client client, int bal) {
try {
if (bal > 0) {
System.out.println(client.getName() + " "
+ "trying to deposit on account " + number);
try {
... | {
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"tags": "java, programming-challenge, multithreading, finance",
"url": null
} |
cardiology
Title: Cardiac pacemaker: how can different nodes have different frequencies? Primary SA node creates 70 beats per minute and secondary AV node 40-60 beats per minute. Is the AV node inactive (and other subsequent nodes) while the SA node is functional? If the primary, secondary and tertiary nodes are worki... | {
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"tags": "cardiology",
"url": null
} |
quantum-field-theory, probability, unitarity
$$ (U(t_1,t_2)|\psi\rangle,U(t_1,t_2)|\phi\rangle) = (|\psi\rangle,|\phi\rangle) \quad\forall t_1,t_2$$
which is easily seen to be equivalent to $U^\dagger U = \mathrm{id}_\mathcal{H}$ by definition of the adjoint.1 It is also evident that it is bad if time evolution is not... | {
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"tags": "quantum-field-theory, probability, unitarity",
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python, python-3.x, interpreter
def get(self, hrm):
if self.pointer:
d = hrm[self.data]
return d.data if isinstance(d, HRMBox) else d
return self.data
class HRMBox:
def __init__(self, data):
if isinstance(data, HRMBox):
self.word = data.word
... | {
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# distributive lattice
Also found in: Wikipedia.
## distributive lattice
(mathematics)
A lattice in which “greatest lower bound” obeys a distributive law with respect to “least upper bound,” and vice versa.
## distributive lattice
(theory)
A lattice for which the least upper bound (lub) and greatest lower bound (g... | {
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php, object-oriented, laravel, controller
If you aren't familiar with the principle Don't repeat yourself I recommend reading about it:
The Don’t Repeat Yourself (DRY) principle states that duplication in logic should be eliminated via abstraction;
Duplication is Waste
Adding additional, unnecessary code to a codeba... | {
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"url": null
} |
diffraction, poynting-vector, x-ray-crystallography
$$I(R,\phi,2\theta)=I_{0}\frac{r_{e}^{2}}{R^{2}}\frac{1+\cos^{2}2\theta}{2}GG^{\ast}\left<FF^{\ast}\right>\quad\quad (2)$$
with $X^{\ast}$ the complex conjugate of $X$ and $G$ the Laue interference function (wich is zero almost everywhere except for the directions fo... | {
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"tags": "diffraction, poynting-vector, x-ray-crystallography",
"url": null
} |
gravity, visible-light
Very massive objects warp / curve the space around them.
Light travels between two points along the line with the shortest length.
So ok, in space that is flat and not warped the second statement seems to make sense. If I shine a flashlight in a huge empty region of space, I shouldn't expect th... | {
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ros, services, pointcloud
Originally posted by Kilin on ROS Answers with karma: 56 on 2012-12-12
Post score: 1
Short answer, yes. sensor_msgs/PointCloud2 is the message type to transmit point clouds; if you want to do pcl processing with them you'll need to convert them to pcl::PointCloud<T> using pcl::fromROSMsg and... | {
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java, performance, algorithm, array, linked-list
public class IDResolver implements AutoCloseable {
// This class is intended to be instantiated. main() is a thin entry point.
// The set of all IDs as read from the file. Modern RAM capacity will easily
// fit hundreds of thousands of IDs at once.
priv... | {
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"tags": "java, performance, algorithm, array, linked-list",
"url": null
} |
python, performance, python-3.x, programming-challenge
Where:
the series_id is a 3 characters long string that is present at the beginning of every pill_id, before the - sign, for example, L01 is the series_id in pill_id = L01-12.
the act_subst_wgt is the expected weight (mg) of the active substance content in the gi... | {
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"tags": "python, performance, python-3.x, programming-challenge",
"url": null
} |
Insight #1: A Curious Sum
The sum of the arctangent solutions was about 1.57…, a decimal form suspiciously suggesting a sum of $\pi/2$. I wasn’t yet worried about all solutions in the required $[0,2\pi ]$ interval, but for whatever strange angles were determined by this equation, their sum was strangely pretty and s... | {
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"lm_q1_score": 0.9814534344029238,
"lm_q1q2_score": 0.8262126746108839,
"lm_q2_score": 0.8418256492357358,
"openwebmath_perplexity": 1322.0619264201237,
"openwebmath_score": 0.9063564538955688,
"tags":... |
zoology, entomology, ornithology, flight
Title: Why are two-winged animals much more common than four-winged? In flying vertebrates, almost all have only two wings (with the exception of Microraptor and its close relatives). This makes some sense because you need some way to walk also, and a wing isn't very good as a ... | {
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"tags": "zoology, entomology, ornithology, flight",
"url": null
} |
c++, object-oriented, type-safety
Iterator End() {
return store.end();
}
ConstIterator Begin() const {
return store.begin();
}
ConstIterator End() const {
return store.end();
}
ConstIterator CBegin() const {
return store.cbegin();
}
ConstIterator CEnd... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c++, object-oriented, type-safety",
"url": null
} |
php, security, http, authentication
It reads user id from database[already user registered].
Creates a unique id and salt, hashed value. Sets expiration date for 7 days and store it in the database
cookie is [cookie_name=token]
All the times but not the first
Checks for cookie_name in the browser and if it is presen... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "php, security, http, authentication",
"url": null
} |
c++, ros-melodic, nodelet
pcl/BAGReader pcl/BoundaryEstimation pcl/ConvexHull2D pcl/CropBox pcl/EuclideanClusterExtraction pcl/ExtractIndices pcl/ExtractPolygonalPrismData pcl/FPFHEstimation pcl/FPFHEstimationOMP pcl/MomentInvariantsEstimation pcl/MovingLeastSquares pcl/NodeletDEMUX pcl/NodeletMUX pcl/NormalEstimation... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c++, ros-melodic, nodelet",
"url": null
} |
conformal-field-theory, stress-energy-momentum-tensor
1Shameless self-promotion: See this Q&A of mine for why we get a central charge in the quantum theory. | {
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"tags": "conformal-field-theory, stress-energy-momentum-tensor",
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} |
\left( \int_{-\infty}^\infty \text{constant} \cdot e^{-y^2}\,dy \right) \,dx \\[10pt] & = \int_{-\infty}^\infty \left( \int_{-\infty}^\infty e^{-x^2} \cdot e^{-y^2}\,dy \right) \,dx \end{align} | {
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"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9879462183543601,
"lm_q1q2_score": 0.8316784588351461,
"lm_q2_score": 0.8418256412990658,
"openwebmath_perplexity": 624.7362448725125,
"openwebmath_score": 0.9988240003585815,
"tag... |
filter, please make sure that the domains *. Finding Products of Complex Numbers in Polar Form. imag to get the values of real and imaginary values. Converting Complex Numbers to Polar Form. 37. B. of complex numbers. Find the modulus and argument of the following complex numbers: a)3-3i. Example 1 - Dividing complex n... | {
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"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9817357259231532,
"lm_q1q2_score": 0.8159628254882636,
"lm_q2_score": 0.8311430499496096,
"openwebmath_perplexity": 434.16522965605,
"openwebmath_score": 0.8907320499420166,
"tag... |
go, mapreduce
byLen, err := wordsByLen(f)
if err != nil {
fmt.Fprintln(os.Stderr, err)
return
}
for _, words := range byLen {
if len(words) > 0 {
list := strings.Join(words, " ")
fmt.Printf("%d(%d): \t%s\n", len(words[0]), len(words), list)
}
}
}
... | {
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"openwebmath_score": null,
"tags": "go, mapreduce",
"url": null
} |
ros, ros-melodic, bloom-release
Title: How to reuse downloaded rosdistro repo in bloom-release?
When I do new releases of my packages, one of the longest taking phases is cloning the rosdistro repo over and over.
How can I tell bloom-release the path to a locally cloned repo which it'd use instead of cloning?
Another... | {
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"openwebmath_score": null,
"tags": "ros, ros-melodic, bloom-release",
"url": null
} |
fft, audio
Will any of the above 3 approaches work? Is there any other way of getting a finer grained spectrum?
Edit: it struck me later that I could achieve the result by using a larger "bin" . I.e., 8192 frames instead of 1024 frames as input to my FFT routine. Is this the best approach available? if you are not exp... | {
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"openwebmath_score": null,
"tags": "fft, audio",
"url": null
} |
electrostatics, charge, electromagnetic-induction
Let's start with the case of a grounded sphere with the radius $a$. In this instance the outer surface of the sphere will have the potential of $0$. Where inside the spherical region do we need to place a charge and how much of it to create a surface with $\Phi = 0$?
T... | {
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"tags": "electrostatics, charge, electromagnetic-induction",
"url": null
} |
Vectors are given to higher dimensions context of a parallelepiped '' in English-Spanish from Reverso:! / volume Factor \det ( A^TA ) } $a volume / volume?... The triple scalar product can be used to find the volume, because it is an absolute of... In which the vectors which it is an absolute value of the vectors are g... | {
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"lm_q2_score": 0.8311430415844384,
"openwebmath_perplexity": 795.754320048608,
"openwebmath_score": 0.7257758975028992,
"tags... |
c, file, pointers
Title: Use of pointers with file-reading program I'm working on a school assignment, and it's working fine, but I have a feeling I'm over-using pointers, and I just can't think of a way to not pass a triple pointer to the function readFile.
I'd be more than grateful for your suggestions, and if you h... | {
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"tags": "c, file, pointers",
"url": null
} |
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