text stringlengths 1 1.11k | source dict |
|---|---|
c, game, graphics, game-of-life, winapi
Why don't you calculate a single value from a neighbourhood (2 * live_cells_in_3x3 + is_live which is less than 20) and then use that to look up the result.
You only need the windowclassname for registering the windowclass. In main() you can use the ATOM returned instead. Elimin... | {
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"tags": "c, game, graphics, game-of-life, winapi",
"url": null
} |
c++, performance, r, rcpp
// [[Rcpp::export]]
arma::mat SummarizeLastCol(arma::cube Q){
int n = size(Q)[0];
int k = size(Q)[2];
int t = size(Q)[1];
arma::mat cd(n,k);
for(int j=0; j<k; ++j){
cd.col(j) = Q.slice(j).tail_cols(1);
}
return cd;
}
void inplace_tri_mat_mult(arma::rowvec &x, arma::mat con... | {
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"tags": "c++, performance, r, rcpp",
"url": null
} |
vba, functional-programming
Also, you're using some nice concise bit-shifting, and you'll have noticed that VBA doesn't have any shifting operators, but you might consider using some bit-shifting functions to make the code slightly clearer (and you can re-use them everywhere else that you need to shift bits.
And final... | {
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"tags": "vba, functional-programming",
"url": null
} |
ds.algorithms, partial-order, order-theory
Algorithm in Figure 1 proceeds by incrementally adding one element at a time and in step 4.c it asks for finding a chain decomposition of the set of elements considered so far. I'm struggling with this point because, even if we keep the chain decomposition up-to-dated I am no... | {
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"tags": "ds.algorithms, partial-order, order-theory",
"url": null
} |
algorithms, traveling-salesman
Title: Number of Solutions for Brute Force Algorithm of Travelling Salesperson Problem
We are learning about the travelling salesperson problem in my high school class and we are discussing how computers could solve for the problem, even though the problem is intractable, using a brute ... | {
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"tags": "algorithms, traveling-salesman",
"url": null
} |
ros, bashrc, ros-hydro, ros-kinetic
source /opt/ros/kinetic/setup.bash
Originally posted by pacifickid9 on ROS Answers with karma: 1 on 2017-10-20
Post score: 0
Original comments
Comment by gvdhoorn on 2017-10-21:
Did you copy-paste your .bashrc twice?
Comment by pacifickid9 on 2017-10-21:
yes i think i did. just fi... | {
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"tags": "ros, bashrc, ros-hydro, ros-kinetic",
"url": null
} |
newtonian-mechanics, waves, interference
Title: Interaction of two sound emitting particles in a medium Consider a free particle at rest suspended in an infinite medium.
If the particle becomes the source of a sound wave in one direction, will the particle start to move in the opposite direction due to an opposing for... | {
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"tags": "newtonian-mechanics, waves, interference",
"url": null
} |
performance, f#
Title: Counting letter frequencies from an input file Out of pure curiosity, I decided to create a short F# script to calculate the letter frequencies based on the input file. Everything works smoothly and as I would expect. My questions regarding my code are as follows: | {
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"tags": "performance, f#",
"url": null
} |
$P(x) = -2x^3 + 6x^2 - 6x + 2 = 0$
$P(x) = x^3 - 3x^2 + 3x - 1 = 0$.
Notice that if you let $x = 1$, you get
$P(1) = 1^3 - 3(1)^2 + 3(1) - 1$
$= 1 - 3 + 3 - 1$
$= 0$.
By the factor and remainder theorems, this means that $(x - 1)$ is a factor.
Now long divide, and you should find
$x^3 - 3x^2 + 3x - 1 = 0$
$(x ... | {
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"openwebmath_score": 0.6787335872650146,
... |
electrostatics, electric-fields, charge
Title: What would be the electric field lines for parallel plates with different charge density? How would electric field lines look like if charge densities on parallel plates (like the ones used in parallel plate capacitors) are different (still opposite though so electric fie... | {
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"openwebmath_score": null,
"tags": "electrostatics, electric-fields, charge",
"url": null
} |
human-biology, neuroscience, human-physiology, peripheral-nervous-system
The central nervous system, which includes the brain and spinal cord
The peripheral nervous system, which is all of the nerves in the rest of the body (fingers, arms, feet, etc.)
The signals taken by the peripheral nerves mainly travel to t... | {
"domain": "biology.stackexchange",
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"tags": "human-biology, neuroscience, human-physiology, peripheral-nervous-system",
"url":... |
discrete-signals, wavelet, transform, cwt
And at the end of the processing workflow (denoising, compression, restoration), you can compare the outcome of some objective or subjective measures (SNR, PSNR, SSIM, other norm-related metrics).
In between, one can estimate vector features on wavelet coefficients. Such measu... | {
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"tags": "discrete-signals, wavelet, transform, cwt",
"url": null
} |
statics
First subsystem:
$C_x + F_{DE} \cos(45) = 0$
$C_y + F_{DE} \sin(45) + 20= 0$
$F_{DE} \sin(45) \times 25 + 20 \times 150= 0$
Second subsystem:
$B_x - C_x = 0$
$B_y - C_y - A_y - 20= 0$
$-F \times 150 + A_y \times 60 - C_x \times 30 = 0$
Third subsystem:
$-B_x - F_{DE} \cos(45) = 0$
$A_y -B_y - F_{DE} \sin(45)=... | {
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"tags": "statics",
"url": null
} |
c#, unity3d
/// <summary>
/// Gets a string value from PlayerPrefs
/// </summary>
/// <remarks>
/// This method has a side effect of creating a PlayerPrefs entry for the given key if one does not exist.
/// </remarks>
/// <param name="key">The key.</param>
/// <param name="defaultValue">The... | {
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} |
Our techniques are basically the same.
But we have different answers for 3 doubles and 3 singles. Could you just check yours please?
Melody Jan 12, 2020
#7
0
We got the permutations right!. It is the combinations of the remaining 3 numbers that we disagree. You have 6.5.4 =120, while I count only 20! Should yours b... | {
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"tags": null... |
quantum-mechanics, operators, complex-numbers, eigenvalue, observables
Title: Finding measurements in non-Hermitian operators I know how the measurement postulate in quantum mechanics works, in regard to hermitian operators, but what if an operator is non-hermitian? Can i apply the following reasoning?
If an operator... | {
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"tags": "quantum-mechanics, operators, complex-numbers, eigenvalue, observables",
"url": ... |
control, pid
To solve your control problem using PID, you need to define your X and Y as functions of time based on your desired velocity. So you will have:
$$ X(t), Y(t)$$
Or in case of moving on a rail, define travel distance as a function of time. Then in each iteration of your control loop you know where the cart ... | {
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For the first piece, consider the function defined by $f(u)=\left\{\begin{array}{cr}\dfrac{u^{2}}{u+u^{5} },&\text{if }u\ne0,\\[0,3cm]0,&\text{if }u=0,\end{array}\right.$
hence $f$ is a continuous function on $[0,1]$ and thus, integrable on $[0,1].$ From here, the first piece of the integral converges; now, let's chec... | {
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"lm_q2_score": 0.8633916047011595,
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"openwebmath_score": 0.9581829905509949,
"ta... |
javascript, image, library, canvas
},
/* Reset() -> this
* reset the image to the original values (undo all manipulations). */
Reset: function(){
this.resource = this.source;
if(this.autoUpdate) this.Draw();
return this;
},
/* DOM(element?:<dom>) -> ... | {
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"tags": "javascript, image, library, canvas",
"url": null
} |
reinforcement-learning, game-ai, implementation, gaming, algorithm-request
As an aside, one related thing I find interesting is in using modern AI techniques to blend animations and make interactions between actors and the environment look more realistic. Although it is a lower-level feature than the question about en... | {
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"tags": "reinforcement-learning, game-ai, implementation, gaming, algorithm-request",
"url": nu... |
c#, .net
Title: Maximize profit on a trade route Fixed trade route with goods and prices and fixed cargo capacity.
How can I optimize profit?
No cost to trade or transport - just fixed capacity, route, and prices. All products use the same capacity, which is kind of artificial, but this is just a single pass starting ... | {
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fluid-dynamics, simulations, computational-physics, cellular-automaton, fluid-statics
You initialize your distribution functions in an unconventional way; usually, we want to convert known macroscopic 'lattice' quantities like $\rho$ and $\vec{u}$ into $f_i$. An easy way to do this is using the equilibrium distributio... | {
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"tags": "fluid-dynamics, simulations, computational-physics, cellular-automaton, fluid-stat... |
ros, c++, ros-kinetic, parameters
Title: Passing Matrices as params in Launch Files
I'd like to pass the data contained within a matrix as a parameter to several nodes in a launch file. This link states how to pass in std::vector<...> params for bools, ints, doubles, etc. Is it possible to pass in something like a st... | {
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"tags": "ros, c++, ros-kinetic, parameters",
"url": null
} |
deep-learning, pytorch, curve-fitting
if self.dropouts[index]:
self.layers.append(torch.nn.Dropout(self.dropouts[index]))
self.layers.append(self.activations[index])
def forward(self, x):
# Forward pass for a given input
for layer in self.layers:
x = layer(x)
return x
def set_... | {
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"tags": "deep-learning, pytorch, curve-fitting",
"url": null
} |
astronomy, stars, luminosity, binary-stars, eclipse
Alternatively worded, in the graph above, when the two stars are next to each other the magnitude will be at it's highest (the tops of the 'm'), but what will be the brighter star be in front or behind the dimer star in the center of the 'm', or at the ends on the 'm... | {
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"id": 2996,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "astronomy, stars, luminosity, binary-stars, eclipse",
"url": null
} |
hilbert-space, linear-algebra
Title: Demonstration of the completness of an orthonormal set of functions I find this concept of completness a little bit dense when it comes to prove this property of some set of orthonormal functions. In one of my classes, my professor proved this for the orthonormal set of functions $... | {
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"tags": "hilbert-space, linear-algebra",
"url": null
} |
Tutorials
crispyrat:
A guide to sqrt and cbrt
crispyrat:
So first of all what is a sqrt? To put it simply, a square root is the number that can multiply itself by twice to get the desired answer. For example the square root of 64 is 8 or 8 as 8*8=64 and -8*-8 is 64.
crispyrat:
A square root can be a negative howev... | {
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"lm_q2_score": 0.8289388019824947,
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"openwebmath_score": 0.5470000505447388,
"tags... |
atmospheric-science, thermal-radiation, climate-science
Title: Equations for the two-plane model of the greenhouse effect I'm trying to understand this "toy model" of the greenhouse effect.
http://www.realclimate.org/index.php/archives/2007/04/learning-from-a-simple-model | {
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"tags": "atmospheric-science, thermal-radiation, climate-science",
"url": null
} |
c, queue, embedded
If supported in your tool chain, queue_is_full and queue_is_empty could take their parameters as const struct queue * queue since they do not make any chances to the queue.
There is a subtle bug when removing the last element from the queue. When a queue is initialized, and when the first element is... | {
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"tags": "c, queue, embedded",
"url": null
} |
quantum-mechanics, particle-physics, hydrogen
is absent for other atoms because the charge of the other electrons partially screens the potential as you move away from the nucleus. Consequently states with lower $l$, which penetrate closer to the nucleus, have lower energy. | {
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"tags": "quantum-mechanics, particle-physics, hydrogen",
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} |
homework-and-exercises, electromagnetic-induction
Title: Faraday's Law applied to an airplane Consider an airplane flying from west to east. A question I'm working on says that the top of the right wing is most likely to develop a positive electrical charge. I get why it would be the top of the wing, not bottom, but I... | {
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"tags": "homework-and-exercises, electromagnetic-induction",
"url": null
} |
# How can I find the work on a block when it is pulled up in a curve?
#### Chemist116
The problem is as follows:
The figure from below shows a force acting on block as it is pulled upwards in a curve from point $A$ to $B$. It is known that the block is pulled by a force which its modulus is $100\,N$. Find the work (... | {
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"lm_q2_score": 0.8824278556326344,
"openwebmath_perplexity": 365.674266728435,
"openwebmath_score": 0.8642544746398926,
"tags": ... |
python, python-3.x, console, authentication
@staticmethod
def run() -> None:
os.system(f"pylect {' '.join(sys.argv[1:])}")
if sys.argv[1] in {"list", "-l"}:
Main.list()
elif sys.argv[1] in {"version", "-v"}:
Main.version()
elif sys.argv[1] in {"run", "-r"}:
Main.run()
I think you could possib... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python, python-3.x, console, authentication",
"url": null
} |
ros, eigen, catkin, eigen3, ros-jade
Title: [jade] eigen3 not found build error
Even after following jade/Migration for Eigen, I still see that eigen3 is not found.
https://travis-ci.org/swri-robotics/marti_common/jobs/113832799#L3181-L3193
CMake Error at CMakeLists.txt:12 (find_package):
By not providing "FindEig... | {
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"openwebmath_score": null,
"tags": "ros, eigen, catkin, eigen3, ros-jade",
"url": null
} |
quantum-mechanics, harmonic-oscillator, eigenvalue
$\langle x| n\rangle= \frac{1}{\pi^{\frac{1}{4}}\sqrt{2^n (n!)}} e^{-\frac{x^2}{2}} H_n(x)$.
I tried to find a similar representation for the wave function in momentum space, $\langle p | n \rangle$ but couldn't find anything in my QM literature. I know that I can app... | {
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"openwebmath_perplexity": null,
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"tags": "quantum-mechanics, harmonic-oscillator, eigenvalue",
"url": null
} |
fft, noise, spectrogram
My concern is the vertical lines that show up from my implementation, which are most visible in the higher frequencies. They may interfere with other stuff I will try to do later on. Has anyone ever had the same problem or know the cause? How can I get rid of them?
Additional information:
I use... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "fft, noise, spectrogram",
"url": null
} |
temperature, paleoclimatology
The Oligocene climate change was a global increase in ice volume and a
55 m (181 feet) decrease in sea level (35.7–33.5 Ma) . . .
This line is fine. It indicates that during the 400,000 year cold period (presumably 33.9 to 33.5 mya), ice formed and sea levels fell, a total of 55 mete... | {
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"tags": "temperature, paleoclimatology",
"url": null
} |
noise, phase
(Note for those more familiar with phase noise and jitter: This is what would occur when our clock has local interference from another clock or pure tone at a different frequency which could induce both sinusoidal amplitude and phase. However it is more typical for our jitter to be limited by non-stationa... | {
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"openwebmath_score": null,
"tags": "noise, phase",
"url": null
} |
machine-learning, training, keras, overfitting, underfitting
Title: Is my GRU model under-fitting given this plot of the training and validation loss? I was running my gated recurrent unit (GRU) model. I wanted to get an opinion if my loss and validation loss graph is good or not, since I'm new to this and don't reall... | {
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"openwebmath_score": null,
"tags": "machine-learning, training, keras, overfitting, underfitting",
"url": null
} |
ros, rviz, visualization, 3d-visualization
Title: rviz to plot a plane with known (x,y,z) points
Hi guys,
I have a list of (x,y,z) points all of which lie on the same plane. I need to visualize this plane on rviz with these points.
I googled on how to make a plane on rviz and someone mentioned making a cube but reduc... | {
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"tags": "ros, rviz, visualization, 3d-visualization",
"url": null
} |
death, apoptosis
Title: molecular indicators of apoptosis: clarification needed I understand that DNA fragmentation is a molecular indicator of apoptosis. What distinguishes this as a hallmark of programmed cell death, versus one of necrosis? Although both involve DNA fragmentation, the pattern produced is very differ... | {
"domain": "biology.stackexchange",
"id": 1219,
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"tags": "death, apoptosis",
"url": null
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The following graphical solution relies on the idea that it's possible to separate the contribute of the zero in w=0 by referring the magnitude measurements to a line slanted with a -20dB/decade slope. Thanks to the properties of logarithms, division becomes translation on the magnitude Bode plot. We also have to take ... | {
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"lm_q2_score": 0.884039278690883,
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"openwebmath_score": 0.8104416728019714,
"tags... |
quantum-mechanics, hilbert-space, quantum-information, notation
Title: Understanding bra-ket notation as in quantum computer in terms of pure algebra Since I'm not a Physics student, but a Mathematics student, the only physics course I went through is elementary physics (일반물리학, textbook by Jearl Walker, David Halliday... | {
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"tags": "quantum-mechanics, hilbert-space, quantum-information, notation",
"url": null
} |
neural-networks, machine-learning, unsupervised-learning, environment
Title: How can a neural network work with continuous time? I have an ANN model that receives an input and produces an output. The output is an action that interacts with the environment and changes the input accordingly. The network has a desired en... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "neural-networks, machine-learning, unsupervised-learning, environment",
"url": null
} |
polymers, terminology
Title: What do "USP 26" and "USP 42" mean? I am being asked by a colleague if the Polyvinylpyrrolidone (PVP) we buy in our lab is "USP 26" or "USP 42". I've never heard those terms before. I searched up online but found nothing.
I'm sure its something concerning the US Pharmacopeia, but I've foun... | {
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"openwebmath_score": null,
"tags": "polymers, terminology",
"url": null
} |
volcanology, tectonics, magmatism
Title: Do the rocks below an active sill go down, or those above go up, or both? Having read a little about sill formations like the Palisades Sill (eastern USA) and Whin Sill (UK), I understand that strata became separated by the injected layer of magma, with monumental thicknesses a... | {
"domain": "earthscience.stackexchange",
"id": 637,
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"tags": "volcanology, tectonics, magmatism",
"url": null
} |
astronomy, terminology, eclipse
What is worth mentioning is that the 1979 eclipse was only visible for a relatively small region of north-western United States; it was mostly visible from Canada. On the other hand, the 1918 eclipse was visible in totality right across a band of America, with a path very similar to tha... | {
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"tags": "astronomy, terminology, eclipse",
"url": null
} |
catkin-make
Title: Is ROS_PARALLEL_JOBS behaviour changed but doc not updated?
The behaviour of ROS_PARALLEL_JOBS seems to be changed since it does not work setting it to or example "1". But catkin_make --help says:
-j [JOBS], --jobs [JOBS]
Specifies the number of jobs (commands) to run
... | {
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"tags": "catkin-make",
"url": null
} |
ros, arduino, std-msgs, rosserial
Originally posted by monidiaz on ROS Answers with karma: 92 on 2012-10-26
Post score: 0
Can you install rosserial directly from the package repositories?
sudo apt-get install ros-fuerte-rosserial
Originally posted by Jon Stephan with karma: 837 on 2012-10-27
This answer was ACCEPTED... | {
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"tags": "ros, arduino, std-msgs, rosserial",
"url": null
} |
formal-languages, programming-languages, regular-expressions
Title: What is the Relationship Between Programming Languages, Regular Expressions and Formal Languages I've looked around the net for an answer to this question and it seems as if everybody implicitly knows the answer except me. Presumably this is because t... | {
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"tags": "formal-languages, programming-languages, regular-expressions",
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homework-and-exercises, mathematics, calculus, singularities, asymptotics
I was also told I can interchange the signs of the integral and the summation but I can’t see where that comes in. How do I rewrite this integral?...
Symbolically, you want to collect all the pieces of your equation for $f(x)$ that depend on $n... | {
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"tags": "homework-and-exercises, mathematics, calculus, singularities, asymptotics",
"url... |
semiconductor-physics, equilibrium, crystals
As an example, the total energy of a system can always be changed by a constant because this constant doesn't affect the gradient. Thus, the force on the system is unaffected by such a constant and the dynamics of the system are untouched. In that way, we could just add an ... | {
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"tags": "semiconductor-physics, equilibrium, crystals",
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availability of models. The summaries are useful for determining if the two samples are from the same distribution. If the distribution of x is normal, then the data plot appears linear. 999, which is closer to 1 than is the linear correlation value of 0. You may also be interested in the fitted vs residuals plot , the... | {
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"openwebmath_score": 0.5142551064491272,... |
c++, algorithm, stack
Remove all the print statements in your code.
template <class T>
bool Mystack<T>::isEmpty() const //const: none of the class members can be modified in this function
{
if (top == -1)
{
std::cout << "Is Empty" << std::endl;
return true;
}
else
... | {
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"tags": "c++, algorithm, stack",
"url": null
} |
ros, rosbag, ros-comm, realtime
Title: Ros eats up RAM while recording rosbag remotely
I am running my ros application on a robot (arm) with limited RAM (1 GB).
I configured my robot as the rosmaster. The rosbag recording was happening on my local linux machine whoser Ros master was the robot.
Whenever I start my ros... | {
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"tags": "ros, rosbag, ros-comm, realtime",
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### Laplace Transform Second Shifting Theorem Solutions
Periodic Functions The Unit Step Function and the Second. Laplace Transform Not only is the result F(s) called the Laplace transform, but the operation just described, which yields F(s) from a given f(t), is also called the Laplace transform. https://en.m.wikiped... | {
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"openwebmath_score": 0.7942330837249756,
"tags"... |
c#, .net-datatable
connection.Open();
foreach (RowContent content in contents)
{
partNumberParameter.Value = content.Material;
adjustedDateParameter.Value = content.RequestedDate;
suggestedDateParameter.Value = content.SuggestedDate;
quantityParameter.Va... | {
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"tags": "c#, .net-datatable",
"url": null
} |
thermodynamics, statistical-mechanics, nuclear-physics, potential-energy, climate-science
Why is hydrogen bonding stronger in heavy water? To get some intuition, let's consider the quantum harmonic oscillator. If you solve the Schrödinger equation with a potential energy function of $V(x) = \frac12 kx^2$, you get so... | {
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"tags": "thermodynamics, statistical-mechanics, nuclear-physics, potential-energy, climate-... |
vba, excel
'/ one at least seems to work and handles errors properly and runs in only a few seconds.
'/
'/ Change Log: | Author | Date | Description of Changes
'/ -------------------------------------------------------------------------------------------------... | {
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"tags": "vba, excel",
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} |
c++, template
using ElementType =
typename std::iterator_traits<IteratorElem>::value_type;
using IndexType =
typename std::iterator_traits<IteratorIndex>::value_type;
std::vector<ElementType> result;
std::for_each(index_begin,
index_end,
... | {
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"tags": "c++, template",
"url": null
} |
python, object-oriented, python-3.x, finance, sqlite
""" Generate a random string for card activation """
def set_user_code(self, account_number, acctype, email):
with conn:
# account_found = BankAccount.get_account(self, account_number, acctype)
account_found = BankAccount.get_user_co... | {
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python, beginner, file-system, modules, makefile
def on_modified(self, event):
if event.is_directory or event.event_type is not "modified":
Don't use is to compare strings, you've got no guarantees it'll do anything useful.
Use ==
return
self.callback(event.src_path)
I think this ... | {
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"tags": "python, beginner, file-system, modules, makefile",
"url": null
} |
c++, memory-management, c++20
bool do_is_equal(const std::pmr::memory_resource &other) const noexcept override {
if (this == &other) {
return true;
}
auto op = dynamic_cast<const FileArenaResource *>(&other);
return op && op->file_ == file_;
}
};
} // namespace frozenca
MemoryMappedFile.h (mo... | {
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"tags": "c++, memory-management, c++20",
"url": null
} |
molecular-biology
Where stem cell transplants are used is in the replacement of bone marrow after total body radiation/chemotherapy to destroy marrow (in those cases where the disease has arisen in the marrow). In these cases we rely on the poorly defined process that allows cells to target their microenvironment.
Fo... | {
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"openwebmath_score": null,
"tags": "molecular-biology",
"url": null
} |
calibration, ros-melodic, camera-calibration
given by http://docs.ros.org/en/noetic/api/sensor_msgs/html/msg/CameraInfo.html
inage width: 1920 image height:1080
canera nane: narrow stereo
cameramatrix: rows: 3 cols:3
data:[1963.58626 0. 978.96792 0. 1961.4452 548.41778 0. 0. 1.]
distortion_model: plumb bob
disto... | {
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"tags": "calibration, ros-melodic, camera-calibration",
"url": null
} |
homework-and-exercises, newtonian-gravity, acceleration, coulombs-law, free-fall
How to find the exact solution $r(t)$ of the ODE ?
How to find the exact solution $t(r)$ which is the inverse function of $r(t)$? First of all, define the variable $u(t)=R+r(t)$, so your equation can be put as:
\begin{equation}
{d^2u\over... | {
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gazebo, ros-kinetic
Comment by stefanvan on 2018-10-15:
@kump And if so, should I set all the transmissions to EffortJointInterface?
Comment by kump on 2018-10-15:
If you want to actuate all the wheels, then you need transmission tag for all the wheels. Think about it as this: The transmission assigns a motor to the w... | {
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"tags": "gazebo, ros-kinetic",
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electric-current, voltage, power
If this were true we could dispense with the return wire and simply drive a copper rod into the ground right next to the load and connect the return side of the load to it. But a hundred miles of dirt leading all the way back to the power plant is not a good conductor, and the transmis... | {
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"tags": "electric-current, voltage, power",
"url": null
} |
math, finance, health, fitness, and more. All the users have to do remember the formula for a root & that is $$\sqrt[n]{x}$$. Able to display the work process and the detailed explanation. This cube root calculator might come in handy whenever you need to calculate the cube root of any given positive or negative number... | {
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"lm_q2_score": 0.8723473763375644,
"openwebmath_perplexity": 530.7942227051152,
"openwebmath_score": 0.5723264217376709,
"tags": nu... |
regular-languages, pumping-lemma
The pumping lemma states that
If a language $L$ is regular, then there exists $p\gt 0$ such that for all strings $s\in L$ such that $|s|\ge p$, there exists a way to split $s$ in the form $x,y,z$ such that all of the following conditions hold: | {
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"tags": "regular-languages, pumping-lemma",
"url": null
} |
ros, tutorial, msg, rosmsg
'diagnostic_aggregator': ['/opt/ros/indigo/share/diagnostic_aggregator/msg'], 'robot_state_publisher': ['/opt/ros/indigo/share/robot_state_publisher/msg'], 'visualization_msgs': ['/opt/ros/indigo/share/visualization_msgs/msg'], 'rqt_py_console': ['/opt/ros/indigo/share/rqt_py_console/msg'], ... | {
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"tags": "ros, tutorial, msg, rosmsg",
"url": null
} |
linear system AX=B, which can be overdetermined, underdetermined, or exactly determined. Generated on Fri Feb 21 2020 21:31:34 for CGAL 5. The first part of cuSolver is called cuSolverDN, and deals with dense matrix factorization and solve routines such as LU, QR, SVD and LDLT, as well as useful utilities such as matri... | {
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"id": null,
"lm_label": "1. Yes\n2. Yes\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9848109485172559,
"lm_q1q2_score": 0.8227933346453876,
"lm_q2_score": 0.8354835371034368,
"openwebmath_perplexity": 1043.0111490718846,
"openwebmath_score": 0.6158665418624878,
... |
nextflow
All three processes successfully execute their commands. However, they are executed sequentially. For example, the first process mapToRef runs sequentially for all read pairs, followed by samToBam, which too, runs sequentially after all mapToRefs have finished execution. I was under impression that paralleliz... | {
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"tags": "nextflow",
"url": null
} |
By construction $ADF$, $CEG$ and $BFG$ are isoceles so that the bisectors of $DF$, $EG$ and $FG$ are also bisectors of the angles of the triangle and meet at the incenter.
By symmetries, $IB=ID=IE=IF=IG$. | {
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electromagnetism, differential-geometry, coordinate-systems, covariance
(This was in the original answer, I moved it down here so as not to disrupt the flow of the above).
If you really want to know how to compute $\mathbf{A}(\mathbf{r})$ (or $\mathbf{E}$ and $\mathbf{B}$) in spherical coordinates, without going throu... | {
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"tags": "electromagnetism, differential-geometry, coordinate-systems, covariance",
"url":... |
classical-mechanics, differential-geometry, hamiltonian-formalism, phase-space, canonical-conjugation
For a given $i$, $q^i$ is a real-valued function of (an open subset of) the $2n$-dimensional cotangent bundle smooth manifold $T^*Q$. The one-form $\theta$ over $T^*Q$ is therefore technically $2n$-dimensional. But as... | {
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"tags": "classical-mechanics, differential-geometry, hamiltonian-formalism, phase-space, ca... |
gravity
I've never heard of a dynamical 3 body interaction where the angular momentum would tend to line up, but maybe...
If I were you, I would start by reading up on the formation of the solar system. The Wikipedia article on it
https://en.wikipedia.org/wiki/Formation_and_evolution_of_the_Solar_System
is pretty rea... | {
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"tags": "gravity",
"url": null
} |
quantum-mechanics, research-level, bells-inequality
$$E(A_iB_j) \mapsto -E(A_iB_j)$$
$$E(A_i) \mapsto -E(A_i)$$
$$E(B_j) \mapsto E(B_j)$$
And the inequality becomes
$$-E(A_1B_1)-E(A_1B_2)-E(A_1B_3)-E(A_2B_1)-E(A_2B_2)+E(A_2B_3)-E(A_3B_1)+E(A_3B_2)-E(A_1)-E(A_2)-E(B_1)-E(B_2) \leq 4,$$
which is Śliwa's version.
Now, we... | {
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"tags": "quantum-mechanics, research-level, bells-inequality",
"url": null
} |
javascript, node.js, console, tic-tac-toe
Notice how I removed the vars?
I'm a little confused by what your isInt function is trying to accomplish.
To make it simpler, just run isNaN on the position. It will return NaN (which acts like false in a conditional) if the user entered a string, rather than a number. | {
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"tags": "javascript, node.js, console, tic-tac-toe",
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homework-and-exercises, electric-circuits, symmetry, electrical-resistance
$I_{B-in} = \frac{19}{60} I$
flowing into $B$. Now we superpose these solutions - we get a solution, where there is current $I$ going into $A$ and it all comes out from $B$. Also notice that $\pm I/20$ leaving from each vertex has also vanished... | {
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"ur... |
here $f(x) = \sqrt{x}$, $x = 17$ and $a = 16$
thus, $\sqrt{17} = f(17) \approx f(16) + f'(16)(17 - 16)$
now continue
10. Originally Posted by NoiseandAttack
And also, what does differentiable mean?
"differentiable" means we can differentiate it. that is, the function's derivative can be found, or exists at a certain... | {
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"openwebmath_score": 0.8994489312171936,
"ta... |
particle-physics, vacuum, virtual-particles
allows to write the exact integral for the first term in the pertubation mathematical series for the crossection of two electrons interacting.
The line is called a virtual photon, because it has the quantum numbers of a photon but its mass is off shell, ( the four vector of ... | {
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"tags": "particle-physics, vacuum, virtual-particles",
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c, strings
printf("\n");
}
In this code I have 3 functions to handle the string:
InitStr - to initial string
AddStr - to add string
JoinStr -to Join string
The code works fine, however, I am not sure if this is a decent way of handling a string since I am using pointers. I have a few suggestions.
First you are not... | {
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"tags": "c, strings",
"url": null
} |
c++, caesar-cipher
Following @Ryan 's suggestion, -25 can be used to merge 'z' and 'Z'. It then becomes so short to beg for a ternary:
char shift(char ch, int shift)
{
return ch == 'z' || ch == 'Z' ? ch - 25 : ch + 1;
} | {
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"tags": "c++, caesar-cipher",
"url": null
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the-sun, elemental-abundances
Title: How are heavier elements such as carbon and silicon distributed within the Sun? In a previous question I asked about the source of carbon and silicate dust that Solar Probe Plus will encounter in its close flyby of the Sun. It seems likely that most sources would include infall fro... | {
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"tags": "the-sun, elemental-abundances",
"url": null
} |
the interval estimate for the mean of the dependent variable, , is called the But, i get a warning Error: cannot allocate vector of size 1.2 Gb. 1) Because I am a novice when it comes to reporting the results of a linear mixed models analysis. one detail, when it says "a stopping distance ranging between 51.83 and 62.4... | {
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"lm_q1_score": 0.9353465152482724,
"lm_q1q2_score": 0.8207448643731794,
"lm_q2_score": 0.8774767970940974,
"openwebmath_perplexity": 1723.8696756955428,
"openwebmath_score": 0.4082730710506439,
"tags": nul... |
PRODUCT on two relations that is on two sets of tuples, it will take every tuple one by one from the left set (relation) and will pair it up with all the tuples ⦠00:11:37. DBMS - Select Operation in Relational Algebra. We also use third-party cookies that help us analyze and understand how you use this website. }$, ... | {
"domain": "opticourses.org",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.96323053709097,
"lm_q1q2_score": 0.8316451658877985,
"lm_q2_score": 0.863391611731321,
"openwebmath_perplexity": 1635.044777521244,
"openwebmath_score": 0.6331157684326172,
"tags": n... |
quantum-mechanics, black-holes, quantum-information, hawking-radiation, unitarity
So quantum decoherence allows us to understand one aspect of the apparent collapse of the wave function in a measurement of quantum system (which necessarily involves interacting with a classic system through the measurement). However, i... | {
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"tags": "quantum-mechanics, black-holes, quantum-information, hawking-radiation, unitarity"... |
c#, image, winforms, graphics, genetic-algorithm
private System.Windows.Forms.PictureBox pictureBox1;
private System.Windows.Forms.Button OpenImageButton;
private System.Windows.Forms.OpenFileDialog openFileDialog1;
private System.Windows.Forms.PictureBox pictureBox2;
private System.Windows.Forms.Butto... | {
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"tags": "c#, image, winforms, graphics, genetic-algorithm",
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} |
python, algorithm
setup = "arr = [i for i in range(1,300,15)]"
print(min(timeit.Timer('a=arr[:];from __main__ import jump_search_2; jump_search_2(arr, 16)', setup=setup).repeat(7, 1000)))
print(min(timeit.Timer('a=arr[:];from __main__ import jump_search_wiki; jump_search_wiki(arr, len(arr), 16)', setup=setup).repeat(7... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python, algorithm",
"url": null
} |
evolution, molecular-biology, molecular-genetics, translation, mrna
"Naturally occurring misrecognition indicates that discriminating two base-paired near-cognate codons from the perfect three-base-paired AUG
codon is subject to mistakes. Mutations in translation
initiation factors, such as eIF1 and eIF2b, further... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "evolution, molecular-biology, molecular-genetics, translation, mrna",
"url": null... |
acid-base, equilibrium, aqueous-solution, ph
None of the other ingredients have appreciable acid-base character (appears to be the case here)
Degradation of the other ingredients into acidic/alkaline species can be neglected
No acidity or alkalinity is likely to enter from the environment | {
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"tags": "acid-base, equilibrium, aqueous-solution, ph",
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java, performance, primes
An example of a windowed sieve that you could modify to work by segments. | {
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point to xy-axis } plot(aligned.pts, xlim=c(-5,5), ylim=c(-5,5), xlab="xs", ylab="ys", pch=19) # show aligned dataset title("Aligned Data Set") abline(h=0,col="grey"); abline(v=0,col="grey") sd.xs <- sd(aligned.pts[,1]) # compute sd's sd.ys <- sd(aligned.pts[,2]) # Now we have all the data to draw the ellipse(s) plot(p... | {
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"openwebmath_perplexity": 8614.690130796489,
"openwebmath_score": 0.6164302229881287,
"tags": null,
... |
python, object-oriented, role-playing-game, adventure-game, battle-simulation
# tuple = subj=[0],verb=[1],noun=[2],skill=[3],weapon=[4],action=[5],direction=[6],number=[7]
# Checks = ([0]= checks, [1] = Methods, [2] = Parameters)
# sentence_type = type of sentence being handled
#### These will hold multip... | {
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"tags": "python, object-oriented, role-playing-game, adventure-game, battle-simulation",... |
stress-strain, solid-mechanics
Title: Why shear stress is developed only in the two set of planes for a rotating pressurized solid cylinder? Why not in the third set of plane? In case of a rotating pressurized solid cylinder,why shear stress is not developed in the $ABCD\ \& \ EFGH$ planes while the other two set of ... | {
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"tags": "stress-strain, solid-mechanics",
"url": null
} |
c#, thread-safety, locking, generics, extension-methods
Title: Synced/Atomic access Forward
I would love any comments you have, any ideas, any flaws you can find, and any suggestions you might have regarding the code below.
If this is similar to other implementations, I would love to know about them, since this is som... | {
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"tags": "c#, thread-safety, locking, generics, extension-methods",
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} |
pathology, ethology, parasitology, intelligence
T. gondii is a parasite whose typical life cycle includes both mice and cats as hosts. The transmission involves the mice being eaten by a cat. Mice infected with T gondii will tend to lose some interest in being sheltered in close spaces and wander out into open space... | {
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"tags": "pathology, ethology, parasitology, intelligence",
"url": null
} |
c#, thread-safety
protected override void OnStart(string[] args)
{
ProcessThread cThread;
cThread = new ProcessThread();
m_cProcessThread = new Thread(new ThreadStart(cThread.InitProcess));
m_cProcessThread.Start();
}
protected override void OnStop()
{
m_cPro... | {
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"tags": "c#, thread-safety",
"url": null
} |
file, error-handling, c++17
// file is already closed and stream resources cleaned up by this point
A small aside that is actually a HUGE rabbit hole
There is a big chunk in the middle of your code that looks like this:
string yesOrNo = {""s};
bool isFalse = 1;
do {
cout << "Do you wish to delete th... | {
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"tags": "file, error-handling, c++17",
"url": null
} |
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