text stringlengths 1 1.11k | source dict |
|---|---|
navigation, kinect, pcl
Originally posted by evanmj on ROS Answers with karma: 250 on 2011-02-27
Post score: 5 | {
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"tags": "navigation, kinect, pcl",
"url": null
} |
• It's the way math works... It is not a convention, but a theorem: we have an axiom asserting that there is a unique set $y$ such that : $\forall x \lnot (x \in y)$ and we call $y$ "the emptyset". Then we assume the def of set-inclusion : $A \subset B \leftrightarrow \forall x (x \in A \to x \in B)$ and we derive, by ... | {
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"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9902915226589475,
"lm_q1q2_score": 0.8586181746826396,
"lm_q2_score": 0.867035771827307,
"openwebmath_perplexity": 225.69110551115045,
"openwebmath_score": 0.7517534494400024,
"tag... |
java, beginner, game, rock-paper-scissors
}
} I would make some changes, although your code is quite simple.
First, get rid of the magic Strings for rock/paper/scissors, and create an enum.
I would possibly also move the logic of checking if it's a win/draw/loose inside that enum, so it would be much easier to add new... | {
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"tags": "java, beginner, game, rock-paper-scissors",
"url": null
} |
quantum-mechanics, thermodynamics, quantum-information, entropy, reversibility
is not clear whether we could ever control enough of the environment
to achieve any desired nonzero rate of dissipation, however small.
But, despite all these caveats, it may yet be possible to set up
reversible computations that dis... | {
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"tags": "quantum-mechanics, thermodynamics, quantum-information, entropy, reversibility",
... |
complexity-theory, time-complexity, probabilistic-algorithms
Let $X_i$ denote the outcome of the $i$th trial, and thus $X=\sum X_i$ the number of trials that succeed. We can assume conservatively that our probability for false positives is $.9$; this means that if we make $n$ independent trials on a string $\sigma\no... | {
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"tags": "complexity-theory, time-complexity, probabilistic-algorithms",
"url": null
} |
fluid-dynamics, fluid-statics
In atmospheric transport there are huge differences in latitudinal, meridional and interhemispheric transport rates as they have different causes, mechanisms and different boundary conditions.
Boundary conditions: The bottom of the earth acts approximately like a solid no-slip wall where ... | {
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"tags": "fluid-dynamics, fluid-statics",
"url": null
} |
acoustics, everyday-life, doppler-effect
The change in pitch is owing to the change in the component of the velocity joining the hearer and the falling object: it is this component that determines the Doppler shift of the sound, exactly like the falling pitch of a train horn as the train approaches and passes you. If ... | {
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"tags": "acoustics, everyday-life, doppler-effect",
"url": null
} |
java, object-oriented, interface, immutability
@Override
public StudentType retrieveStatus() {
return type;
}
}
If there is any new type of status, it can be added my implementing StudentStatus, no need to modify the Student class.
Use:
List<String> documents = new ArrayList<Strin... | {
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"tags": "java, object-oriented, interface, immutability",
"url": null
} |
c++, beginner, object-oriented, eigen
// Destructor
~LSM();
// Generate the Laguerre Polynomials
Eigen::MatrixXd Laguerre(Eigen::VectorXd, const int);
// Generate Gaussian noise
Eigen::VectorXd Gaussian(const double M);
// Generate M paths of stock prices (Geometric Brownian Motion)
Eige... | {
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"tags": "c++, beginner, object-oriented, eigen",
"url": null
} |
c++, parsing, tree
Is fine: The && operator evaluates the left hand side first and only if this evaluation returns true will it evaluates the right hand side. So the above expression is well formed and correct.
Convert from char to string using: which I think constantly create a new variable s and delete it.
Yes it ... | {
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"tags": "c++, parsing, tree",
"url": null
} |
ros, moveit, ros-kinetic
Originally posted by Madcreator on ROS Answers with karma: 114 on 2020-03-18
Post score: 1
Original comments
Comment by gvdhoorn on 2020-04-10:
@Madcreator: if @v4hn's answer answered your question, please accept the answer by clicking the checkmark left of the answer. It will turn green.
We ... | {
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"tags": "ros, moveit, ros-kinetic",
"url": null
} |
parsing, regex, perl
So, logic in parser is each line data belongs to each node (node will be unique in the input file). Here you can see the Volume data which is generated based on the time. For example, NODE01 volume data it shows for 18:15 to 18:16 (10 volume values, that means each value is been generated in 6secs... | {
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"tags": "parsing, regex, perl",
"url": null
} |
operating-systems, scheduling, process-scheduling
Either choice (placing the newly unblocked process at the tail or at the head) is reasonable, but they have different consequences as described by @Gille's answer to a broader question.
If you place the newly unblocked process at the tail of the queue then you maintain... | {
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"tags": "operating-systems, scheduling, process-scheduling",
"url": null
} |
vba, ms-access
If ctl.Tag <> "" Then
tagArray = Split(ctl.Tag, ":") 'Split the "Tag" property into an array
'Apply each number from the "Tag" property of the control to the Move method respectively
ctl.Move formDetailWidth * (CInt(tagArray(ControlTag.FromLeft)) / 10... | {
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"tags": "vba, ms-access",
"url": null
} |
time-complexity, recurrence-relation
For $2 < k << n$ and $2 < d = O(\log n)$, is there a formula in terms of $d$, $k$ and $n$ (either exact, big-O or Theta), that predicts the output for
branch(0, d, n, k); | {
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"tags": "time-complexity, recurrence-relation",
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} |
vba, ms-access
Private Enum ButtonControls
bcCopy = 19
bcCut = 21
bcPaste = 22
bcSortSmallToLarge = 210
bcSortSortLargeToSmall = 211
bcDelete = 478
bcNewRecord = 539
bcRowHeight = 541
bcDeleteRecord = 644
End Enum
Private Sub CreateFormDatasheetClipboard()
Dim menu As Office.Co... | {
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"tags": "vba, ms-access",
"url": null
} |
python, performance, file, osx
find & remove redundant file/directory
programmatically 'tag' files (ie. the feature by the same name new to OS X as of 10.9)
develop an API for manipulating and organizing my files as per my whims, essentially
Probably some software has already been written that will do lots of what I ... | {
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"tags": "python, performance, file, osx",
"url": null
} |
quantum-mechanics, wavefunction, quantum-tunneling
Title: What happens if we detect an electron in a place with higher potential than the wavefunction has energy? A wavefunction has a particular energy and is spread over space. For example, an electron in the ground state (n=1) in hydrogen has an energy of -13.6 eV, ... | {
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"tags": "quantum-mechanics, wavefunction, quantum-tunneling",
"url": null
} |
python, search, numpy
Total time: 0.006642 s
File: <ipython-input-95-5e22e2fbabc9>
Function: find_pulse_slow_revised at line 15
Line # Hits Time Per Hit % Time Line Contents
==============================================================
15 def find_pulse_... | {
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"tags": "python, search, numpy",
"url": null
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fluid-dynamics, tensor-calculus, stress-strain, geophysics
The stress tensor is the off-diagonal terms in the total pressure (or stress) tensor. The divergence of these terms relate to the following analog: $\partial_{k} \ \tau_{i,j}$ is the rate of change along the $\mathbf{k}$-direction of the ith component of the... | {
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"tags": "fluid-dynamics, tensor-calculus, stress-strain, geophysics",
"url": null
} |
ros-melodic
Title: Failed to process package 'roscpp':
Hello, I hope all of you are doing awesome.
I recently bought a raspberry pi 4 with just 1 GB of RAM
My raspberry is running Raspbian buster Lite.
I followed these instructions: http://wiki.ros.org/melodic/Installation/Source.
However when invoking catkin_make_is... | {
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"tags": "ros-melodic",
"url": null
} |
catkin, ros-fuerte, rosbuild
Originally posted by JeffRousseau on ROS Answers with karma: 1607 on 2012-05-17
Post score: 3
Original comments
Comment by joq on 2012-05-17:
Are they broken because of catkin, or just ordinary bit-rot?
Comment by Eric Perko on 2012-05-17:
Relevant Groovy SIG: http://www.ros.org/wiki/groo... | {
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"tags": "catkin, ros-fuerte, rosbuild",
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quantum-mechanics, operators, hilbert-space, observables
Title: What Hermitian operators can be observables? We can construct a Hermitian operator $O$ in the following general way:
find a complete set of projectors $P_\lambda$ which commute,
assign to each projector a unique real number $\lambda\in\mathbb R$. | {
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"tags": "quantum-mechanics, operators, hilbert-space, observables",
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thermodynamics, definition, conventions
Title: Which one true in First law of thermodynamics: $Q = \Delta U \pm W = \Delta U \pm p\Delta V$ or $\Delta U= \Delta Q + \Delta W $? Which one true in First law of thermodynamics:
$Q = \Delta U \pm W = \Delta U \pm p\Delta V$? (where $\Delta U$ is change of internal energy... | {
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"tags": "thermodynamics, definition, conventions",
"url": null
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java, performance, image
if (key.length != m_K) {
throw new KeySizeException();
}
final Object[] nbrs = new Object[n];
final NearestNeighborList nnl = new NearestNeighborList(n);
// initial call is with infinite hyper-rectangle and max distance
final HRect hr = HRe... | {
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"tags": "java, performance, image",
"url": null
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electromagnetic-radiation, atomic-physics, frequency, wavelength, optics
processes of photoelectric absorption, inverse bremsstrahlung, Compton scattering to name a few "continuum processes". These are known as free-bound or free-free processes and can produce absorption at essentially all wavelengths. | {
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"tags": "electromagnetic-radiation, atomic-physics, frequency, wavelength, optics",
"url"... |
reference-request, information-theory, data-compression
Burrows-Wheeler transform permutes the characters based on the lexicographic ordering of the suffixes starting after them.
Algorithms in the Lempel-Ziv family describe the text in terms of exact and/or inexact repeats.
A graph can be described in terms of bicliqu... | {
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"tags": "reference-request, information-theory, data-compression",
"url": null
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java, minecraft
import com.clanplugin.commands.implementation.RejectCommand;
import com.clanplugin.commands.implementation.RevokeCommand;
import com.clanplugin.commands.implementation.SetCbCommand;
import com.clanplugin.commands.implementation.SetLeaderCommand;
import com.clanplugin.commands.implementation.SetNameComm... | {
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"tags": "java, minecraft",
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thermodynamics, theoretical-chemistry, quantum-chemistry, spectroscopy
Is there anyone knowing how to derive Gordy & Cook's approximation? Please tell me and I appreciate it very much.
Besides, another little question, are such approximations still useful as nowadays computers are greatly powerful? Sorry for the late ... | {
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"tags": "thermodynamics, theoretical-chemistry, quantum-chemistry, spectroscopy",
"url":... |
quantum-mechanics, resource-recommendations, education, mathematics
Title: Trouble with Math in Physics I am a current high school student and I am very interested in physics, especially particle physics (that stuff is super cool!). Unfortunately, my school only teaches classical physics, so I have to continue my stud... | {
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"url": nul... |
In this situation, one could break even on one's own throws but make a profit if the other player does badly, or make a loss if the other player does well, "if" losing a toss loses a dollar and winning a toss wins a dollar. Or, if the two players lost every time, "player A" wins "player B"'s 6 dollars and "player B" wi... | {
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"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9732407191430024,
"lm_q1q2_score": 0.8001879385405742,
"lm_q2_score": 0.8221891283434877,
"openwebmath_perplexity": 1827.2710372528784,
"openwebmath_score": 0.7864811420440674,
"ta... |
So, every two more sides we get a new circle, and all others increase in size with the outer one approaching the green circle. Lets set then $n$ to 32 for example:
## Question
How can the the radius $r_m$ ($m=1,2,3...$) of the $m$th red circle be calculated for a polygon with $n$ sides inside the imagined circle of r... | {
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"lm_q1q2_score": 0.828207891328539,
"lm_q2_score": 0.8459424353665381,
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"openwebmath_score": 0.8511841297149658,
"tag... |
This is how i do it:
First
$dx=(a-a\cos{t})dt$
$dy=a\sin{t}dt$
So now i include all of that into the integral. But i don't know how to determine the borders. It can be seen from the picture that if i want to integrate until the first arc, i should use limits from 0 to 2*r*pi or in my case to 2*a*pi. But those would be... | {
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"lm_q1_score": 0.9780517475646369,
"lm_q1q2_score": 0.8313157974484454,
"lm_q2_score": 0.8499711794579723,
"openwebmath_perplexity": 381.09352077283904,
"openwebmath_score": 0.8866435885429382,
... |
solar-energy
If we take into account the fact that our gutter has a fixed orientation, the energy received will be even lower than that. Thus, we won't have enough energy to melt the ice.
Given this data, I'd say it's not possible.
As for the ice filling the gutter. The problem is still the same. Making sure that the ... | {
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14. ** ~p (assumption)
15. ** ~(p | ~p) (reiteration 10.)
16. * ~p => ~(p | ~p) (implication introduction 14., 15.)
17. * ~~p (negation introduction 13., 16.)
18. ~(p | ~p) => ~~p (implication introduction 10., 17.)
19. ~~(p | ... | {
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"openwebmath_score": 0.6854864358901978,
"tags... |
An atom is the smallest unit of ordinary matter that forms a chemical element. Geometry is taught in the same way as algebra. Definition of diameter 1 mathematics : a chord (see chord entry 3 sense 2 ) passing through the center of a figure or body 2 mathematics : the length of a straight line through the center of (I ... | {
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"lm_q1_score": 0.9597620619801095,
"lm_q1q2_score": 0.8039158592740694,
"lm_q2_score": 0.8376199592797929,
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"openwebmath_score": 0.7377389669418335,
"ta... |
neural-networks, machine-learning, reference-request, autonomous-vehicles
"A full build of Autopilot neural networks involves 48 networks that
take 70,000 GPU hours to train. Together, they output 1,000 distinct
tensors (predictions) at each timestep."
It seems like most companies don't publish clear information abou... | {
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"openwebmath_score": null,
"tags": "neural-networks, machine-learning, reference-request, autonomous-vehicles",
"url": nul... |
Thanks!
4. Jan 30, 2014
### BvU
That would be a little difficult, precisely because it describes an isolated case. It says there is energy left over, that has to go somewhere to get the "in rest" situation. E.g. in overcoming the air resistance which heats up the air a little.
5. Jan 30, 2014
### Bromio
Okay. So ... | {
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mass, measurements, weight, metrology, scales
Title: How can a beam balance measure mass? In Newtonian physics, mass is the amount of matter in an object. So, how can a beam balance measure the amount of matter in an object (which is the mass of the object). A beam balance does not measure mass; it measures weight.
Th... | {
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"url": null
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kinetics
Is this correct? Also could you please suggest a faster method of solving this type of question.
Thank you. You could plot the data to determine the order of the reaction. I would use Microsoft Excel to do this. Reproduce the data and then add columns that calculate the $\ln [A]$ and $\frac{1}{[A]}$. Then... | {
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There are $7$ choices for the first $3$ bits, $1$ choice for the fourth, and $2^4=16$ for the remaining bits. This gives an answer of
$$2^8-7(2^4)=16(2^4)-7(2^4)=9(2^4)$$
- | {
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"openwebmath_score": 0.8567094206809998,
"tag... |
rotation, jupiter, saturn
The values for this dimensionless parameter are
0.003461 for the Earth,
0.08919 for Jupiter, and
0.1576 for Saturn. | {
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polymers, halides, carbohydrates
between iodine and ether or alcohol, and explained this new band by the concept of intermolecular charge transfer spectra$^{[3]}$.
The "simple" idea behind a charge transfer complex is given below:
$$\ce{I2 + D -> I^{\delta -}...D^{\delta +}}$$ Reference 4 gives more details. (It also... | {
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c++, performance, c++17
void addSkyscrapers(const std::vector<int> &skyscrapers,
Direction direction);
void addNopes(const std::vector<std::vector<int>> &nopes,
Direction direction);
std::vector<Field *> getFields() const;
private:
template <typename SkyIterator,... | {
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macos, gtest, homebrew, macos-lion, osx
See: http://code.google.com/p/googletest/wiki/FAQ#Why_is_it_not_recommended_to_install_a_pre-compiled_copy_of_Goog
There are open tickets related to this problem.
https://github.com/ros/homebrew-fuerte/issues/5
https://github.com/ros/catkin/issues/157
In the short term installin... | {
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c++, c++11, multithreading, concurrency, queue
reader_thread.join();
writer_thread.join();
std::cout << "Reader Null Count: " << readerNullCount << " Writer Null Count: " << writerNullCount << std::endl;
}
You should be able to compile with:
g++ -std=c++11 -g -o circularptrqueuetest main.cpp -lpthread As to... | {
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"tags": "c++, c++11, multithreading, concurrency, queue",
"url": null
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classification, feature-selection, multiclass-classification, multilabel-classification
Title: Improving classifcation when some are less represented? I have a multi-class classification problem. It performs quite well but on the least represented classes it doesn't. Indeed, here is the distribution : | {
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classification, feature-extraction, image-classification
Here is the paper I was reading which gave me the idea of combining the vocabularies.
A Visual Vocabulary for Flower Classification
Here is what I was reading before:
Implementing Bag of Visual words for Object Recognition
If anyone can point me in the right di... | {
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python-3.x, pygame
pygame.draw.rect(screen, obstacle.color, pygame.Rect(int(obstacle.x), int(obstacle.y), obstacle.width, obstacle.height))
# Drawing the player
pygame.draw.rect(screen, player.color, pygame.Rect(int(player.x), int(player.y), player.width, player.height))
# Update ... | {
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"url": null
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organic-chemistry, crystal-structure, stability, surfactants
For instance, CTAB will cause an aqueous solution of thioacetamide and Lead(II) acetate to form PbS nanocrystals in a octahedron shape, while SDS will cause them to form a dendritic fern like shape, while a CTAB/SDS mixture (5:1) will cause a stellated octah... | {
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"tags": "organic-chemistry, crystal-structure, stability, surfactants",
"url": null
} |
redox, stoichiometry
Ferric oxalate doesn't contain any $\ce{Fe^3+}$ ions, so our main focus here is the conversion of oxalate ($\ce{C2O4^2-}$) into carbon dioxide. The oxidation state of carbon in oxalate is $+3$, while it's $+4$ in carbon dioxide. So there's a net change of $+1$ per carbon atom. Oxalate contains two... | {
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"tags": "redox, stoichiometry",
"url": null
} |
c++, template-meta-programming
inline bool operator ! (void) const { return !Value; };
inline stype operator ~ (void) const { return ~Value; };
inline stype operator & (const _TBase& other) const { return Value & other; };
inline stype... | {
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"url": null
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homework-and-exercises, kinematics
Title: Velocity of the touching point between 2 rotating circles I'm trying to solve the following problem that I'm having a hard time with:
We have circle ${\Sigma}_1$ with center $O_1$ and radius $a_1$. The center $O_1$ is also the center of the static orthonormal coordinate system... | {
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consider the di erential equation for the (damped) harmonic oscil-lator, y + 2 y_ + !2y= L y= 0; (1) where L d2 dt2 + 2 d dt + !2 (2) is a linear di erential operator. We analyzed vibration of several conservative systems in the preceding section. The focus of this lab is on understanding the Harmonic Oscillator, using... | {
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"openwebmath_score": 0.6623950600624084... |
java, optimization, algorithm, cryptography, programming-challenge
Title: Rot -n algorithm in Java This is a rot-n (rotate n times) encrypt/decrypt algorithm, where n can be any integer (+/-).
It's written to encrypt/decrypt all the alphabets (upper/lower case) and leaving behind all non-alphas.
rot-n where n is the k... | {
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"url": nu... |
c#, unity3d
Avoiding hardcoded values
Now that we've reworked the logic, we can remove the hardcoded 4 and -4 magic numbers. Just like we did for the movements, we're going to define private fields:
private int TopBoundary = -4;
private int RightBoundary = 4;
private int BottomBoundary = 4;
private int LeftBoundary = ... | {
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newtonian-mechanics, forces, energy, newtonian-gravity, potential-energy
Regarding the nomenclature of $U=mgh$, note that work is equivalent to energy, so work done to elevate an object changes the object's gravitational potential energy by an equivalent amount, which leads to the equivalent equation $U=mgh$. However... | {
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which is the chain rule and product rule kf Q! Approach Suggested Prerequesites: the definition of the multi-variable chain rule is a constant M 0 and > such. Section gives plenty of examples of the function \begin { equation } what this. Relation between these three rates of change represent help understand and organi... | {
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"openwebmath_score": 0.9811563491821289,
"tags":... |
# How come least square can have many solutions?
I know there always exists a least-square solution $\hat{x}$, regardless of the properties of the matrix $A$. However, I keep finding online that least-square can have infinitely many solutions, if $A$ is not full column rank.
Shouldn't $\hat{x}$ always be unique, as t... | {
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"lm_q2_score": 0.8519528038477824,
"openwebmath_perplexity": 151.1044338877916,
"openwebmath_score": 0.843147873878479,
"tags":... |
python, graph, pathfinding
def BellmanFordPathToSrource(self, single_source):
assert single_source >= 0
assert single_source < len(self.edges_per_vertice) | {
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python, web-scraping, modules
class SearchResults:
def __init__(self, driver: WebDriver):
self.driver = driver
def number_of_articles_and_pages(self) -> int:
elem = self.driver.find_element_by_xpath(
'//table//tr[3]//table//table//td[1]/table//td[1]'
)
n_articles = ... | {
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} |
thermodynamics, energy, enthalpy
If you increased the covalent bonding character in a species you are likely to decrease the ionic bonding character resulting in a lower melting point as forces of attraction are now weaker. However, we do see additional bonding occur in species such as vulcanised rubber where you get ... | {
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"tags": "thermodynamics, energy, enthalpy",
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c#, asp.net
Title: Comma delimited string from list of items Is there a simple way to create a comma delimited string from a list of items without adding an extra ", " to the end of the string?
I frequently need to take an ASP.NET CheckBoxList and format the selected values as a string for insertion into an e-mail. It... | {
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##### DiagramNSLTNon-Surjective Linear Transformation
To show that a linear transformation is not surjective, it is enough to find a single element of the codomain that is never created by any input, as in Example NSAQ. However, to show that a linear transformation is surjective we must establish that every element of... | {
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"tags": null,... |
c#, .net, task-parallel-library
Using Tasks that are first created and later started usually doesn't make much sense. To represent some work to be done, just use a delegate.
Tasks almost never need to be Disposed.
Now, I think that what you want to do would be easiest to achieve using ActionBlock from TPL Dataflow. W... | {
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algorithm-analysis, asymptotics
`
if not node.left and not node.right:
return
or go even further and add an additional check:
if not node.right.left and not node.right.left:
// Do some book keeping
return
if not node.left.left and not node.left.right:
// Do some book keeping
return
IOW i... | {
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"tags": "algorithm-analysis, asymptotics",
"url": null
} |
quantum-mechanics, magnetic-fields, quantum-spin, observables, magnetic-moment
of the electron is 1 (not -1). In these units, the output below has $k=\partial B_z/\partial z=300$. The wave packet is initialized as a Gaussian profile with an rms of 0.15 distance units. In this particular simulation, I used a beam polar... | {
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"tags": "quantum-mechanics, magnetic-fields, quantum-spin, observables, magnetic-moment",
... |
black-hole
Also, for purely theoretical reasons we expect that all black holes are spinning because a non-spinning black hole is the same as a spinning black hole with an angular velocity of exactly zero, and there's no reason why a black hole's angular velocity would be exactly zero. On the contrary, because they are... | {
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"tags": "black-hole",
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} |
halides, toxicity, chemical-biology
The most common table salt substitute is KCl, which, again, won't be harmful to people with a normal diet. The body is good at processing potassium and sodium and can regulate their levels within reasonable bounds. So KCl is safe as the body is used to coping with it. | {
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c#
class Program
{
static void Main(string[] args)
{
var methods = new SortedDictionary<string, Tuple<int, MethodInfo>>();
foreach (var type in new Type[] {typeof(SimpleMath), typeof(Math)})
{
foreach (var method in type.GetMethods().Where(m => m.... | {
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"openwebmath_score": null,
"tags": "c#",
"url": null
} |
error-correction, stabilizer-code
[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0],
[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1],
[1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
[0, 0, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0],
], dtype=int) | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "error-correction, stabilizer-code",
"url": null
} |
python, locking, memcache
Title: Function to lock a file using memcache, Version 2 Based on suggested reviews for Function to lock a file using memcache, I have modified the code to
import os
import shutil
import memcache | {
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So the best strategy appears to be "roll until $4$ or more" with an expected net of $4$. Sometimes you will roll, say, 10 times with this strategy and lose money, but the average net is $4$.
Here is the result of $10^6$ simulated plays with the $4$ strategy:
net/number of occurrences
-21 1
-20 0
-19 0
-18 0
-17 ... | {
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"openwebmath_perplexity": 804.4151723294626,
"openwebmath_score": 0.9786650538444519,
"tag... |
algorithms, audio, autocorrelation
For reference, here's the corresponding audio:
http://soundcloud.com/datageist/breakbeat-autocorrelation
Sure enough, there's a nice spike right in the middle corresponding to the loop point, but it came from processing quite a long segment. On top of that, if it wasn't an exact cop... | {
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"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "algorithms, audio, autocorrelation",
"url": null
} |
c, bioinformatics
return 0;
}; An array of char* is not a great data structure for storing AA or codon sequence data. A pointer takes 4 or 8 bytes per codon, but there are only 64 possible codons so you could easily store one codon per byte as a uint8_t. And with only about 22 amino acids, that's close to being able... | {
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"id": 30142,
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"openwebmath_score": null,
"tags": "c, bioinformatics",
"url": null
} |
Finally there are $1296+280=1576$ numbers with all different digits between $1000$ and $4600$. Is my thought correct? Thanks
• Appears to be $1792$. sum(1 for i in xrange(1000,4601) if len(Counter(str(i)))==4) – Alexey Burdin Apr 30 '15 at 23:55
• You have a mistake in your counting I think: Looking in paragraph 2 if ... | {
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"lm_q2_score": 0.8289388104343892,
"openwebmath_perplexity": 168.9187856148416,
"openwebmath_score": 0.7351952791213989,
"tag... |
javascript, game, playing-cards
return rank + " of " + suit;
}
function debugLog(msg) {
var enabled = false;
if (enabled) console.log(msg);
}
var deck = function () {
cards = [];
// Create deck of cards
for (var suit = 0; suit < 4; suit++) {
for (var rank = 0; rank < 13; rank++) {
... | {
"domain": "codereview.stackexchange",
"id": 16368,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "javascript, game, playing-cards",
"url": null
} |
-(1/(15 [Pi])) 2 (1 - 5 Sqrt[2 - 2 Cos[c]] + 3 (-1 + Sqrt[2 - 2 Cos[c]]) Cos[2 c] + 2 Cos[c] (Sqrt[2 - 2 Cos[c]] + 3 (Log[1 - Cos[c]] - Log[1 + Sqrt[2 - 2 Cos[c]] - Cos[c]]) Sin[c]^2))
Integrate[intc, {c, 0, Pi}]
% // N
128/(45 [Pi])
0.905415
Note: In some cases one has to use Limit or even a series expansion to e... | {
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"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9473810496235896,
"lm_q1q2_score": 0.8071239468808005,
"lm_q2_score": 0.8519528094861981,
"openwebmath_perplexity": 3120.6354301401216,
"openwebmath_score": 0.23758555948734283,
"t... |
javascript, performance, tree, node.js, json
},
{
"_id": "59cbb85b4c4eff813d359c4e",
"preferredName": "Outdoor combination (accessories)",
"codedName": "50090192"
},
{
"_id": "59cbb85b4c4eff813d359c4f",
"preferredName": "Outdoor lounge furniture",
"codedName": "50090200"
},
{
"_id... | {
"domain": "codereview.stackexchange",
"id": 29261,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "javascript, performance, tree, node.js, json",
"url": null
} |
nomenclature, stereochemistry
Title: Cis and trans substituents on rings different stereodescriptors The attached two compounds are diastereomers. They can be differentiated by cis/trans descriptors. Is there another way of describing them as cis/trans seems to be outdated?
EDIT: How to determine the r/s configuratio... | {
"domain": "chemistry.stackexchange",
"id": 4683,
"lm_label": null,
"lm_name": null,
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"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "nomenclature, stereochemistry",
"url": null
} |
classical-mechanics, hamiltonian-formalism, phase-space, volume
I have trouble understanding the intuition behind this. Suppose we take a spherical volume of point particles around the origin (in real space, not phase space). And suppose each of these has a momentum that points radially outwards. Then as that system e... | {
"domain": "physics.stackexchange",
"id": 80449,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "classical-mechanics, hamiltonian-formalism, phase-space, volume",
"url": null
} |
integers, kolmogorov-complexity
Let the Kolmogorov complexity of natural number $n$, $K(n)$, be the number of states in the smallest BB that writes $n$ 1's and halts when given a blank tape. I use this definition so I can use known results about busy beavers, particularly Rado's sigma function, $\sum(n)$. $\sum(n)$ is... | {
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"id": 5237,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "integers, kolmogorov-complexity",
"url": null
} |
biochemistry, metabolism, enzymes, human-physiology, fat-metabolism
[My de-emphasis of glycolysis]
To understand this requires one to consider the different functions of liver and adipose tissue and how they should respond to the fed and fasted state. Then one can appreciate that the differences in enzyme complement a... | {
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"openwebmath_score": null,
"tags": "biochemistry, metabolism, enzymes, human-physiology, fat-metabolism",
"url": null... |
• How did you evaluate $\dfrac 18 \sum_{k=1}^{\infty} \left( \dfrac {1}{8k}-\dfrac {1}{8k+8} \right) = \dfrac {1}{64} \sum_{k=1}^{\infty} \dfrac {1}{k(k+1)}$? I guess its not necessary to calculate the sum because we know it converges anyway, but I'm curious how you got a rational answer, knowing that $\sum_{k=1}^{\inf... | {
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"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9773707986486797,
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"lm_q2_score": 0.8723473829749844,
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"openwebmath_score": 0.9799054861068726,
"tag... |
javascript, algorithm, array
function getLowerCorner(r1,c1,r2,c2)
{
for(var i=c2;i>=c1;i--)
tmpArray.push(matrix[r2][i]);
for(var j=r2-1;j>=r1;j--)
tmpArray.push(matrix[j][c1]);
if(r2-r1 > 0)
getUpperCorner(r1,c1+1,r2-1,c2);
}
var tmpArray = []... | {
"domain": "codereview.stackexchange",
"id": 1189,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "javascript, algorithm, array",
"url": null
} |
dna, rna
Title: Can DNA produce ribozyme-like structures? RNA is known to act as an enzyme via its ability to fold itself in specific ways.
Is DNA capable of such structures? Or is it some biochemical reason stopping the folding?
Have they been observed in nature? There are no known natural DNA enzymes (deoxyribozyme... | {
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"id": 174,
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"lm_q1_score": null,
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"openwebmath_score": null,
"tags": "dna, rna",
"url": null
} |
Distinct numbers with two $3$s and one or fewer $7$s: $\binom{4}{2}3\cdot2=36$.
Distinct numbers with two $7$s and one or fewer $3$s: $\binom{4}{2}3\cdot2=36$.
Distinct numbers with one or fewer $7$s and one or fewer $3$s: $4\cdot3\cdot2\cdot1=24$.
Total: $6+36+36+24=102$
With larger alphabets,
Suppose there are $... | {
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"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9752018419665618,
"lm_q1q2_score": 0.8189101159472174,
"lm_q2_score": 0.8397339716830606,
"openwebmath_perplexity": 393.79432586740074,
"openwebmath_score": 0.797537088394165,
"tag... |
python, python-3.x, linux, automation
get_prefix and get_original_name are duplicate code, they are each other's opposite.
Really, only one method is required.
This method could be called split_custom_prefix and return a tuple for you to unpack.
It can look like
stem = path.stem
if self.category_selector(self.extensio... | {
"domain": "codereview.stackexchange",
"id": 38124,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python, python-3.x, linux, automation",
"url": null
} |
java, algorithm
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.Set;
import java.util.stream.Collectors;
import org.junit.Assert;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;
import org.juni... | {
"domain": "codereview.stackexchange",
"id": 16015,
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"lm_name": null,
"lm_q1_score": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "java, algorithm",
"url": null
} |
c, linked-list, memory-management, circular-list
// find the first block of size greater than or equal to sz
// start searching form the next to the recently allocated block
while( count < freelist.len ) {
prevnode = freelist.curr;
freelist.curr = freelist.curr->header.s.next;
if( freel... | {
"domain": "codereview.stackexchange",
"id": 28401,
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"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c, linked-list, memory-management, circular-list",
"url": null
} |
newtonian-mechanics, general-relativity, forces, momentum, conservation-laws
$$\int ds^{2} =\int g_{ab}{\dot x^{a}}{\dot x^{b}}$$
If the metric tensor $g_{ab}$ has a translation invariance, this motion will necessarily have a conserved momentum associated with it, and will not otherwise. Note: common solutions, like ... | {
"domain": "physics.stackexchange",
"id": 5508,
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"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "newtonian-mechanics, general-relativity, forces, momentum, conservation-laws",
"u... |
a visual interpretation of numerical data by showing the number of data points that fall within a specified range of values (called “bins”). Frequency polygon can be divided into things called the parts of Frequency polygon. Some of the graphs that can be used with frequency distributions are histograms, line charts, b... | {
"domain": "desertdingo.com",
"id": null,
"lm_label": "1. Yes\n2. Yes",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.960361158630024,
"lm_q1q2_score": 0.827387826184822,
"lm_q2_score": 0.86153820232079,
"openwebmath_perplexity": 1024.6579595903306,
"openwebmath_score": 0.5896909832954407,
"tags": n... |
pressure, gas, volume
Title: Why do the litre and cubic metre volumes of cylinder natural gas not correspond? A $47L$ cylinder says it contains $8.4m^3$ of natural gas at $137$ bar pressure.
Could someone explain how we get from $47L$ to $8.4m^3$ ?
I’m not an expert and thought they should be different by a factor of ... | {
"domain": "physics.stackexchange",
"id": 97345,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "pressure, gas, volume",
"url": null
} |
orbital-motion, moon
I agree with the comments - you will find that the issue goes away when you improve your measurement setup. The naked eye was not made for this kind of thing. | {
"domain": "physics.stackexchange",
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"openwebmath_score": null,
"tags": "orbital-motion, moon",
"url": null
} |
fluid-dynamics, pressure, water, flow, bernoulli-equation
Title: Relation between water flow and pressure Is there any equation that states the relation between pressure and water flow.
I.e. Let's say that in 1 hour with 8mca (water collum meters) pressure I obtain 50m3. What if (giving the same contditions) I execute... | {
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"openwebmath_score": null,
"tags": "fluid-dynamics, pressure, water, flow, bernoulli-equation",
"url": null
} |
optics, interference, interferometry
One tip when aligning the interferometer is to stick a pin which is illuminated from the side of interferometer on the diffuser ? ground glass plate.
Then look through the interferometer and you will see the images of two pins.
Adjust the separation of the mirrors and their orienta... | {
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"tags": "optics, interference, interferometry",
"url": null
} |
priya12 ( -12,630 points ) triangles –1 vote '' ) is perpendicular! And the other leg is 2, or the next level √ 3 cm 30-60-90 triangles 60.! X=A and be of length 2a is 18 cm then find its height draw the in... Sep 4, 2018 in Class x Maths by priya12 ( -12,630 points ) triangles –1 vote these triangles ⋅... Obtain our a... | {
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"lm_q1_score": 0.9553191284552528,
"lm_q1q2_score": 0.810079812550855,
"lm_q2_score": 0.8479677506936879,
"openwebmath_perplexity": 794.0063798105879,
"openwebmath_score": 0.581402063369751,
"tags": null,... |
optimization, bipartite-matching, bipartite-graph
if $i$ has encountered the end of possible edges at $d$, then $d := d - 1$
store the lowest-cost option for all depths up to $d$
iterate 3-6 until $d = 0$.
The short-circuiting predicate terminates a tree if its accumulated cost from $d=0$ to the current depth is equa... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "optimization, bipartite-matching, bipartite-graph",
"url": null
} |
c, strings
Note that just ensuring you never write more than GLOBAL_MAX_CHAR_LIMIT characters into ret._str might fix the buffer overflow, but still is problematic. Consider you might want to create a full pathname by concatenating a directory name and a filename, and the result is longer than can be stored. If you re... | {
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"id": 42221,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c, strings",
"url": null
} |
data-structures, union-find
It sounds like you are thinking that perhaps we can reorganize the inner structure of the tree under $x$ or the tree under $y$. Unfortunately, it's not possible to do that in the standard Union-Find data structure. The data structure doesn't have child pointers (doesn't have any way to ge... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "data-structures, union-find",
"url": null
} |
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