text stringlengths 1 1.11k | source dict |
|---|---|
python, performance, beginner, python-3.x
# to ignore random rows that contain random numbers
if str(line[2]).startswith('/'):
# making a unique key to allow compareson between files
ana_exc_key = (col[1]... | {
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"tags": "python, performance, beginner, python-3.x",
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of a statement S: P(S) denotes degree of belief that S is true. Assuming the coin is fair, each of these outcomes is equally probable. 3 10 Illowsky et al. As the number of tosses increases, the proportion of heads approaches 1/2. Construct a. If the coin is tossed two times and you want the probability of getting 2 he... | {
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"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9857180685922241,
"lm_q1q2_score": 0.841717229585823,
"lm_q2_score": 0.8539127529517043,
"openwebmath_perplexity": 193.1136668269007,
"openwebmath_score": 0.8100138306617737,
"tags": n... |
php, html
HTML:
<!DOCTYPE html>
<html lang="en">
<head></head>
<body class="uploadPage">
<form method="post" enctype="multipart/form-data" class="createFlyer">
<input class="styledInput" id="campaignName" name="campaignName" placeholder="Campaign Name" maxlength="50" type="text... | {
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"openwebmath_score": null,
"tags": "php, html",
"url": null
} |
ros
No Makefile in package roslaunch
[rosmake-2] Starting >>> rostest [ make ]
[rosmake-1] Finished <<< kdl_parser ROS_NOBUILD in package kdl_parser
No Makefile in package kdl_parser
[rosmake-1] Starting >>> flann [ make ]
[rosmake-0] Finished <<< bond ROS_NOBUILD in package bond
No Makefile in package bond
[rosmake-0... | {
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c#, database, generics, framework, fluent-interface
protected DbProvider(
string providerInvariantName,
string connectionString,
Action<DbConfigurationBuilder<TData>> dbConfiguration)
{
_dbProviderFactory = DbProviderFactories.GetFactory(providerInvariantName);
var dbConfi... | {
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"tags": "c#, database, generics, framework, fluent-interface",
"url": null
} |
periodic-table, periodic-trends
Of course, in chemistry, things are never that simple. There lots of details and it is tough to make general statements that are always true. For example, you can say that often times the more "metallic" an element is, the more easily it will be oxidized. However, when you compare eleme... | {
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"tags": "periodic-table, periodic-trends",
"url": null
} |
python, strings, natural-language-processing
:type sentence: string
:param sentence: the sentence to cut
:type max_length: int
:param max_length: the length to which the sentence will be reduced
"""
words = sentence.split()
for index, word in enumerate(words):
word_length = len(word)
... | {
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"tags": "python, strings, natural-language-processing",
"url": null
} |
terminology, lambda-calculus, computation-models, types-and-programming-languages
→ x Extends 9-1 λ→ 11-5 Pairs 126
→ {} Extends 9-1 λ→ 11-6 Tuples ... | {
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"tags": "terminology, lambda-calculus, computation-models, types-and-programming-languages",
"... |
python, python-3.x, sorting
First, let's take out the regex you have:
COMPILED = re.compile(r"([A-Z]+)([0-9]+)", re.I)
For me, the biggest benefit to using re.compile() is being able to separate definition of the regex from its use. It might also offer some speed improvements but those cases are quire rare.
Now, what... | {
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### Three-way Partitioning
Case Growth
Best $O(n)$
Worst $O(n\log{n})$
Space $O(\log{n})$
One problem with quick sort as it is implemented above is that items with keys equal to that of the partition item are swapped anyways, unnecessarily. Three-way partitioning aims to resolve this by partitioning into three separa... | {
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"lm_q2_score": 0.8221891239865619,
"openwebmath_perplexity": 1229.7954954713152,
"openwebmath_score": 0.49524566531181335,
"tags": null... |
performance, primes, assembly, sse
Count for thread 0: 7945632366
Elapsed: 66
Count for thread 1: 7945609666
Elapsed: 65
Count for thread 2: 1
Elapsed: 0
One of the possible optimizations mentioned on the original thread was based on how many times the innermost loop is expected to run before exit... | {
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"tags": "performance, primes, assembly, sse",
"url": null
} |
# Can RMSE be smaller than MAE?
Generally speaking, can RMSE be smaller than MAE?
I am calculating RMSE and MAE for my results. In two out of five methods, the RMSE is smaller than MAE. Note that I am using the same data, the same script, and the same code to calculate RMSE and MAE. The only difference is the algorit... | {
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"lm_q1_score": 0.9828232904845687,
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"openwebmath_perplexity": 585.6499703869565,
"openwebmath_score": 0.7080495357513428,
"tag... |
ros, viso2, transform
Original comments
Comment by tfoote on 2013-06-17:
Please at least copy and paste the warnings so we can help you. www.ros.org/wiki/Support Also specific instructions about how to reproduce your problem would be helpful.
Comment by Jia on 2013-06-17:
sry, I did paste the warning but it didn't sh... | {
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• what if rank$X< n$? I think in this case these points are not optimal – Lee Dec 18 '18 at 9:24
• @Lee a positive definite matrix has full rank. – LinAlg Dec 18 '18 at 15:13 | {
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"lm_q2_score": 0.8539127529517043,
"openwebmath_perplexity": 118.71266508607158,
"openwebmath_score": 0.9629849791526794,
"ta... |
laser, photon-emission
Title: Why is no radiation emitted during the final transmission in He-Ne laser in Ne atom? During the working of He-Ne laser, I have understood everything except for the fact that no radiation is emitted when the electrons go through their final transition and reach the ground state again. Why ... | {
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"openwebmath_score": null,
"tags": "laser, photon-emission",
"url": null
} |
visible-light, laser, home-experiment, frequency
Title: Beam of electromagnetic wave, with radius of 3cm or less I need to create a beam of electromagnetic wave, with radius of 3cm or less, for distance about few meters. What is the minimum frequency (maximum wavelength) that it is really possible? Assuming you're ta... | {
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"tags": "visible-light, laser, home-experiment, frequency",
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a---b---c---d---e---f
Now there is no vertex right at the centre of the path, but there are two, $c$ and $d$, that are closest to the centre; prove that those two vertices are the centres of $T$.
-
The two centers are b and d? – Jane Ke Feb 14 '13 at 6:13
@Jane: The maximum distance from $b$ to another vertex is $4$... | {
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"lm_q2_score": 0.8244619350028204,
"openwebmath_perplexity": 288.3407381151761,
"openwebmath_score": 0.720267653465271,
"ta... |
operators, conformal-field-theory
However, it seems like $\psi_{(m,n)}$ might be doing overtime for both holomorphic and antiholomorphic components of fields. For example, I'm quite confused by equations like 6.14 on page 39, which state things like $\sigma = \psi_{(1,2)} = \psi_{(2,2)}$: | {
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"tags": "operators, conformal-field-theory",
"url": null
} |
condensed-matter, symmetry, topological-insulators
Any help would be appreciated. Suppose you have $\psi_{A}$ and $\psi_{B}$ at zero energy, with
each supported on a different sublattice. Then $P_{A}\psi_{A}=\psi_{A}$
and $P_{B}\psi_{B}=\psi_{B}$ and $P_{B}\psi_{A}=P_{A}\psi_{B}=0$.
These are orthogonal, and also at z... | {
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"tags": "condensed-matter, symmetry, topological-insulators",
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python, python-3.x, web-scraping, selenium, instagram
"""To avoid any errors, with regex find the url and taking the name <search_name>"""
find_name = "".join(re.findall(r"(?P<url>https?://[^\s]+)", search_name))
if find_name.startswith("https"):
self.search_name = urllib.parse.urlparse(fin... | {
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"tags": "python, python-3.x, web-scraping, selenium, instagram",
"url": null
} |
electrochemistry, concentration, hydrogen, reduction-potential, nernst-equation
For electrons, we drop out its standard chemical potential and the activity, so that $\tilde{\mu}_\ce{e^-} = -F \phi^\mathrm{M}$. The letter $\mathrm{M}$ is because the electron as a species belongs to the electrode.
For hydrogen ions, we ... | {
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"tags": "electrochemistry, concentration, hydrogen, reduction-potential, nernst-equation"... |
java, beginner, game, playing-cards
c1 = deck.dealOne();
total = cheat + c1.BJvalue();}}
Delay.wait(100);
System.out.println();
System.out.println(c1.face() + " of " + c1.suit() + " (" + total + ")");
System.out.println();
if(total < 21)
again = again("Hit?");
if(total > 21){
... | {
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"tags": "java, beginner, game, playing-cards",
"url": null
} |
c++
#include <array>
#include <cmath>
#include <complex>
#include <concepts>
#include <cstddef>
#include <iterator>
#include <type_traits>
#include <utility>
namespace toby
{
namespace detail
{
// A point on an affine line can be compared with another, and has
// a difference type (which may be the same type)... | {
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"tags": "c++",
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ngs, microbiology
As you increase the number of reads that you sequence for a library, you decrease the chances of seeing a new read that you have not yet seen before. If you plot the number of unique reads per total reads sequenced, it will look something like the cumulative density function of the exponential distri... | {
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"tags": "ngs, microbiology",
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Wikipedia says this:
In geometry, the circumference (from Latin circumferens, meaning “carrying around”) is the perimeter of a circle or ellipse. That is, the circumference would be the arc length of the circle, as if it were opened up and straightened out to a line segment. … Circumference may also refer to the circl... | {
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"lm_q1_score": 0.9830850862376966,
"lm_q1q2_score": 0.8213513990829128,
"lm_q2_score": 0.8354835309589074,
"openwebmath_perplexity": 660.9697949237782,
"openwebmath_score": 0.7608801126480103,
"ta... |
conventions, frequency, fourier-transform
However, if we choose $b=+1$ then everything reverses. $\tilde{f}^1_{1,+1}(\omega)$ will have a nonzero contribution at $-\omega_0$ while $\tilde{f}^2_{1,+1}(\omega)$ will have a contribution at $+\omega_0$. now $f^1$ is negative frequency and $f^2$ is positive frequency!
Thus... | {
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"tags": "conventions, frequency, fourier-transform",
"url": null
} |
quantum-state, measurement, textbook-and-exercises, linear-algebra, probability
\begin{array}{cccc}
0 & 0 & 0 & 0 \\
0 & \frac{1}{2} & -\frac{1}{2} & 0 \\
0 & -\frac{1}{2} & \frac{1}{2} & 0 \\
0 & 0 & 0 & 0 \\
\end{array}
\right). \tag{11}$$
Now, defining the following measurement operator
$$M_1:=|a^{+}_1\rangle\l... | {
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"tags": "quantum-state, measurement, textbook-and-exercises, linear-algebra, probab... |
organic-chemistry, biochemistry, chemical-biology
These Fe-S clusters are present in the complexes described above and play a big part in the electron transport chain, as they are redox active hence allow the transport of electrons along the chain through a series of redox reaction yielding $\ce{H2O}$ in the final red... | {
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"tags": "organic-chemistry, biochemistry, chemical-biology",
"url": null
} |
sampling, interpolation, resampling
Title: Unexpected Result When Using Sinc Interpolation
blue is how I tried to sinc interpolate. why would something like this happen? Since Sinc based Interpolation requires you to know the data at any point. Hence it is not feasible.
You might do a Truncated Sinc Interpolation.
Th... | {
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Or may this approach is not proper itself.
• What exactly “appears unconvincing ... from the very start” ? – Martin R Mar 29 '18 at 9:08
• You omitted one step, namely that if you work from the bottom up, you can see that $r_n$ itself divides both $a$ and $b$, so it is a common divisor. After that you then work from t... | {
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"lm_q2_score": 0.8633916134888614,
"openwebmath_perplexity": 381.3708144967184,
"openwebmath_score": 0.9816923141479492,
"tag... |
bacteriology, virology, olfaction, taste
they are too small to have any taste and, even if you manage to eat a whole lot of viruses it would taste like water.
You can taste molecules which are far smaller than a virus. Indeed, pheromones and volatile or sticky chemicals and all that jazz are definitely much smaller t... | {
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is positive, and a positive definite matrix is always invertible.The Cholesky decomposition provides an economical method for solving linear equations involving a positive definite matrix. positiv definit, wenn alle Hauptminoren > 0 sind und; negativ definit, wenn alle geraden Hauptminoren der Matrix > 0 und alle unger... | {
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"lm_q1_score": 0.9793540734789343,
"lm_q1q2_score": 0.8074401396890689,
"lm_q2_score": 0.8244619199068831,
"openwebmath_perplexity": 628.0070596655771,
"openwebmath_score": 0.8430898189544678,
"tags": nul... |
• Very nice ! (+1) To make the answer even more complete, you could add a proof of 10.9.9 if you can...?! – tired Jul 28 '15 at 13:47
• @Dr.MV This exactly answers my question, thank you! If possible/you are aware (I know this was not part of the original question) could you explain "why" there is such singular behavio... | {
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"lm_q2_score": 0.8244619199068831,
"openwebmath_perplexity": 545.6714051578219,
"openwebmath_score": 0.8842833638191223,
"tags... |
CASE 1) $$2≤ x≤ 5$$ This gives a finite line.
CASE 2) $$2≤ -x ≤ 5$$ or$$-5≤ x ≤ -2$$This gives a finite line again
A TOTAL OF 2 FINITE RANGES. We need only one finite range.
$$2 ≤ 3x+4 ≤ 6$$
$$x≥-\frac{2}{3}$$ and $$x≤\frac{2}{3}$$ or $$-\frac{2}{3}≤x≤\frac{2}{3}$$
YES this is a finite range from -x to +x
≥ ≤ ∞
d... | {
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"lm_q1_score": 0.9092645025250771,
"lm_q1q2_score": 0.8067036476118283,
"lm_q2_score": 0.8872045981907006,
"openwebmath_perplexity": 2781.7335561924683,
"openwebmath_score": 0.629133403301239,
"tags":... |
If [TEX] A \subseteq N [/TEX] then [TEX] r_ia_i \in N [/TEX] for [TEX] 1 \le i \le n [/TEX] since N is a submodule
and then the addition of these elements, visually, [TEX] r_1a_1 + r_2a_2 + ... ... + r_ma_m [/TEX] also is in N (if two elements belong to a submodule then so does the element that is formed by their addi... | {
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"lm_q2_score": 0.8558511506439708,
"openwebmath_perplexity": 924.8997976305528,
"openwebmath_score": 0.985804557800293,
"tag... |
navigation, robot-pose-ekf
Well i wrote a node that subscribe to a hectorMapping pose (poseupdate) and publish it as odometry. Now the robot_pose_ekf receive odometry massages but still can not publish the robot pose.
Comment by Kevin on 2012-12-11:
Have you tried visual odometry? Probably not as good as real encoders... | {
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6. Originally Posted by Ghost
Is this common terminology outside of pure mathematics? I have never once seen an author exclude the trivial sub-object from the class of proper sub-objects, and I have likewise never seen the object itself referred to as a trivial sub-object.
In Physics it depends. "Standard" Physics, tha... | {
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neural-networks, gradient-descent
You can also look at Sobolev Training Paper (https://arxiv.org/abs/1706.04859). In particular, note that Sobolev training was better than critic training, which indirectly may indicate approximating function may not be the same as approximating gradient and function. In Sobolev traini... | {
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"tags": "neural-networks, gradient-descent",
"url": null
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typescript, sudoku
If they are more succinct/readable, functional approaches are also welcome.
Code
function isValidSudoku(sudoku: sudoku): boolean {
const rows = sudoku;
const columns = [];
const squares = [];
for (let r = 0; r < 9; r++) {
const column = [];
for (let c = 0; c < 9; c+... | {
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"tags": "typescript, sudoku",
"url": null
} |
cosmology, calculus
Title: Boltzmann equation for Photons I am computing the Boltzmann equation for Photons from the book "Modern Cosmology" by Scott Dodelson.
This is the colission term from Compton scattering
Then, the Dirac delta is expanded | {
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"tags": "cosmology, calculus",
"url": null
} |
phylogenetics, hpc, e-utilities
}, 'HTTP::Headers' )
}, 'HTTP::Request' ),
'_content' => 'LWP will support https URLs if the LWP::Protocol::https module
is installed.
',
'_headers' => bless( {
'client-warnin... | {
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"openwebmath_score": null,
"tags": "phylogenetics, hpc, e-utilities",
"url": null
} |
simulations, diffusion, brownian-motion
For the simplest case, the "kicks" are generated by thermal noise, and have a gaussian distribution.
From the Wikipedia article linked above, the equation of motion is:
$$
m \frac{d^2 \vec{x}}{dt^2} = - \lambda \frac{d\vec{x}}{dt} + \vec{f(t)}
$$
Here the $\lambda$ term is from ... | {
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"tags": "simulations, diffusion, brownian-motion",
"url": null
} |
quantum-gate, mathematics, clifford-group, randomised-benchmarking, t-designs
"Relying on the main results of [GT], we classify all unitary t-groups for t ≥ 2 in any dimension d ≥ 2."
In this answer I'm roughly trying to do the same for orthogonal t-groups (finite subgroups of orthogonal groups that are also 2-designs... | {
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"tags": "quantum-gate, mathematics, clifford-group, randomised-benchmarking, t-desi... |
python, error-handling, proxy, udp
As far as testing goes, you're sending to the same IP address so should be pretty safe but some things to try are:
Pull out / reconnect network cables
Turn off / reenable Wi-Fi
Disable / reenable network adapters
Send unexpectedly large packets (over your 4096 buffer size)
Try runni... | {
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b) Evaluate sums in sigma notation. • Understand the First Fundamental Theorem of Calculus (before Worksheet 2). 373383 1 3. SP Day 1 Pg 293#3-39 EOO 45,47,50,51,55,59,63, 66. The Riemann Sum formula provides a precise definition of the definite integral as the limit of an infinite series. How many bushels were consum... | {
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"tags... |
As I noted in a comment, this problem can be solved using NMaximize. Begin by solving the ODEs themselves.
k = 0.2; x0 = 0; y0 = 0; c = 2; T = 2; b = 3;
s = ParametricNDSolve[{y''[t] - c - k*y'[t] == 0, y[0] == y0,
y'[0] == Sin[a], x''[t] - k*x'[t] == 0, x[0] == x0,
x'[0] == Cos[a]}, {x, y}, {t, 0, T}, {a}];
where a... | {
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"lm_q2_score": 0.8354835411997897,
"openwebmath_perplexity": 2039.0374862838528,
"openwebmath_score": 0.26570889353752136,
"tag... |
ros, navigation, base-global-planner, global-planner
setup multi robot system
write standalone global planner providing the paths for all robots
write global planner plugin for move_base that takes as input directly the plan for this specific robot from the above global planner. You can use whatever mechanism you want... | {
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"url": null
} |
c#, excel, error-handling, winforms
The class CRenter has been replaced by Tenant.
The bad C++ programming habit of classes starting with C has been removed, however, the code is now in 2 subdirectories, one called Classes and one called Forms. It helps me to find the code I need to work on. | {
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Type of PlotHow to Specify Coordinates
Single point
Specify X, Y, and Z as scalars and include a marker. For example:
plot3(1,2,3,'o')
One set of points
Specify X, Y, and Z as any combination of row or column vectors of the same length. For example:
plot3([1 2 3],[4; 5; 6],[7 8 9])
Multiple sets of points
(using ... | {
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"openwebmath_score": 0.5981382131576538,
"tags": ... |
On a certain day, orangeade was made by mixing a certain amount of orange juice with an equal amount of water. On the next day, orangeade was made by mixing the same amount of orange juice with twice the amount of water. On both days, all the orangeade that was made was sold. If the revenue from selling the orangeade w... | {
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9615338101862454,
"lm_q1q2_score": 0.8012697652919633,
"lm_q2_score": 0.8333245870332531,
"openwebmath_perplexity": 2962.814225305419,
"openwebmath_score": 0.3879888951778412,
"tags": n... |
haskell
Title: Haskell marking procedure for non-unique lists I'm writing a function for generating solutions for a backtracking search problem. To that end, I need to mark an item from a list by removing it from that list, and placing it in a second list.
So I have a pair of lists:
non-marked items
marked items
and... | {
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java
Further, there is a limit H on the number of boxes on each stack. If a 'drop' command would result in a stack having more than H boxes, the crane ignores this drop command. If the current stack has no boxes, a 'pick up' command is ignored.
You are given the initial number of boxes in each stack and the sequence o... | {
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evolution, ecology, pathology, prion
To directly answer your question, yes, there are other animals that are susceptible to prions diseases when they consume infected members of their own species, or members of compatible carrier species. In the late 80s and 90s, there was a moderate epidemic of Bovine Spongiform Ence... | {
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"tags": "evolution, ecology, pathology, prion",
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} |
# The Stacks Project
## Tag 05CK
Lemma 10.81.11. Let $R \to S$ be a faithfully flat ring map. Then $R \to S$ is universally injective as a map of $R$-modules. In particular $R \cap IS = I$ for any ideal $I \subset R$.
Proof. Let $N$ be an $R$-module. We have to show that $N \to N \otimes_R S$ is injective. As $S$ is... | {
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"lm_q2_score": 0.8397339596505965,
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"openwebmath_score": 0.8515267968177795,
"tags": ... |
c++, simulation
size_t size() {
return m_component_set.size();
}
void addNotGate(std::string not_gate_name) {
checkIsNotLocked();
checkNewGateName(not_gate_name);
NotGate* not_gate = new NotGate{not_gate_name};
m_component_map[not_gate_name] ... | {
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"tags": "c++, simulation",
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} |
image-processing, python
Before I start writing a python / bash program that will convert the files to xml and use complex regex stuff to retrieve what I am looking for, I wanted to ask if anyone could imagine a simpler approach. My knowledge on image metadata is very limited.
Thanks in advance :) Open a few files in... | {
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"tags": "image-processing, python",
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} |
python, beginner, strings, parsing, bioinformatics
if "gi|" in myNameStripped: # Checks to see if line is normal contents
if " " in myStrLast60: # To delete empty spaces in an AA string
myStrSymbols = myStrLast60 # To store myStrSymbols and delete extra space in myStrLast60
myStrLast60 ... | {
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"tags": "python, beginner, strings, parsing, bioinformatics",
"url": null
} |
python, ros-lunar, ubuntu, ubuntu-xenial
Originally posted by billy on ROS Answers with karma: 1850 on 2019-08-11
Post score: 0
You seem to have a setup mixed between python2 and 3. Make sure your PYTHONPATH only contains python2 and also make sure to install numpy with pip2.
Originally posted by ct2034 with karma: ... | {
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"tags": "python, ros-lunar, ubuntu, ubuntu-xenial",
"url": null
} |
reference-request, pl.programming-languages, denotational-semantics, logical-relations
Subject: what is a data refinement relation?
Dear all: anyone still interested in data refinement?
Recently Mak and I have been looking again at an idea we considered
many months ago. The motivation is to characterize
the lo... | {
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ros, gazebo, spawn-model, pr2
any idea? I really don't know what could be the issue.
Thanks
Originally posted by zamboni on ROS Answers with karma: 11 on 2012-02-29
Post score: 0
Original comments
Comment by zamboni on 2012-03-07:
any update?
I see that you have two different ros packages with the same name "object... | {
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"tags": "ros, gazebo, spawn-model, pr2",
"url": null
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motor, pid, wheeled-robot
The issue I have is the PID loop is running at a rate of 50Hz, so when the motor is running at low speeds and a timer compare has not been done, it returns the last calculated value. This is fine, but I could also find myself in the situation where the motor has stopped spinning and I haven't... | {
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"tags": "motor, pid, wheeled-robot",
"url": null
} |
performance, datetime, google-app-engine, google-apps-script
// Script-as-app template.
function doGet() {
var app = UiApp.createApplication();
var button = app.createButton('Find Blanks').setId('button');
var loader = app.createImage('http://preloaders.net/preloaders/496/Flip%20Flop.gif').setVisible(false).set... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "performance, datetime, google-app-engine, google-apps-script",
"url": null
} |
classical-mechanics, terminology, definition, equilibrium, stability
$$
\left(\begin{array}{c}
\ddot{\delta x}\\
\ddot{\delta y}\end{array}\right)=
\left(\begin{array}{cc}
\alpha & \beta \\
\beta &\gamma \end{array}\right)\left(\begin{array}{c}
{\delta x}\\
{\delta y}\end{array}\right) = M\left(\begin{array}{c}
{\delt... | {
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"tags": "classical-mechanics, terminology, definition, equilibrium, stability",
"url": nu... |
discrete-mathematics, predicate-logic
Title: Discrete Mathematics Proofs for ∃ and ∀ Premises or Givens:
$∃x(A(x) → B(x))$
$∀x (B(x) → K(x))$
To Prove:
$∃x(A(x) → K(x))$
My Solution:
$A(z) → B(z)$ From premise and Existential instantiation $x$ for $z$
$B(z) → K(z)$ From premise and Universal instantiation $x... | {
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"tags": "discrete-mathematics, predicate-logic",
"url": null
} |
electromagnetism, energy, electricity, electrostatics, superconductivity
OK, so you got a constant current. What of it? The current will only be able to course forever in the superconductor ring. You cannot try to draw energy off it, because all ways of drawing energy off current increase the resistance. If you add a ... | {
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"tags": "electromagnetism, energy, electricity, electrostatics, superconductivity",
"url":... |
gazebo, sonar, hector, sensor, hector-quadrotor
Original comments
Comment by Johannes Meyer on 2012-09-05:
Which ROS distribution and version of Gazebo do you use? There was a bug in ray sensor simulation in the released simulator_gazebo stack for fuerte prior to 1.6.13, which caused the simulated rays to be shot towa... | {
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"tags": "gazebo, sonar, hector, sensor, hector-quadrotor",
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organic-chemistry, environmental-chemistry
Could anyone check what I have done so far, and provide some hints/guidelines on what to do with the rest, especially on how to classify a PM please?
Thank you so much! 2-Acetylaminofluorene is a solid, mp 192-196 C. It satisfies the definition of being a VOC by virtue of bei... | {
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"tags": "organic-chemistry, environmental-chemistry",
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linked-list, scala
Title: Fixed size double linked list in Scala I have written a double linked list in Scala. The list should be fixed in size and items are always added to the head. if the list reaches max size then the tail is dropped.
This is my code. I want to review this for brevity and functional approach.
seal... | {
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"tags": "linked-list, scala",
"url": null
} |
Discrete Math: Sep 11, 2017: Equivalence relation/ Equivalence classes: Discrete Math: Feb 6, 2016: need help with modular arithmetic and equivalence classes. Equivalence Relations Partition a Set 14 Stirling Numbers of the Second Kind 16 . A Computer Science portal for geeks. Discrete mathematics is the branch of math... | {
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"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9838471675459396,
"lm_q1q2_score": 0.8342706772503036,
"lm_q2_score": 0.8479677583778258,
"openwebmath_perplexity": 868.9884530989659,
"openwebmath_score": 0.6243432760238647,
"t... |
thermodynamics, energy, adiabatic
Title: First law needs adiabat definition but adiabat definition needs heat definition in first law It is usually said that the best formulation of the first law of thermodynamics is that work is path independent on adiabatic paths. From there, you can define the state function of int... | {
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"tags": "thermodynamics, energy, adiabatic",
"url": null
} |
demodulation, ofdm, gnuradio, constellation-diagram, synchronization
Title: OFDM symbol acquisition block in GNU Radio gives rotating constellation even if there is no carrier offset. How is this possible? Why does the constellation rotate when using OFDM Symbol Acquisition block in this flow graph below ?
The only e... | {
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"tags": "demodulation, ofdm, gnuradio, constellation-diagram, synchronization",
"url": null
} |
For example if you transpose a 'n' x 'm' size matrix you'll get a new one of 'm' x … In order to state the transpose property, we need to define the transpose of a matrix. The product will be of size (2 x 2). Do the transpose of matrix. To "transpose" a matrix, swap the rows and columns. The conjugate transpose of a ma... | {
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As mentioned by all other people here there is no disadvantage in picking 11111111 as your lottery number.
However I would just like to add that there is a pattern in these kinds of thinking mistakes.
# Transitivity
Let's say that :
• A = a very unlikely event
• B = a very unlikely event
Our brain is tempted to us... | {
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c++, c++11, linked-list, reinventing-the-wheel
But you are missing a few definitions:
const_iterator begin() const { return const_iterator(head); }
const_iterator end() const { return const_iterator(end_ptr); }
What about reverse iterator?
rbegin(), rend(), rbegin() const, rend() const
You can... | {
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But there are $$4$$ different numbers. So the number of $$3$$-number combinations are- $$(1,2,3)$$,$$(1,2,4)$$,$$(1,3,4)$$,$$(2,3,4)$$. Each can be arranged in $$6$$ ways, so we get $$24$$ ways totally.
So why is my answer different here?
Your answer is different because in the question, repitition is allowed, but yo... | {
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"openwebmath_score": 0.7705864906311035,
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quantum-mechanics, quantum-field-theory, symmetry-breaking, effective-field-theory
a virtually infinite freedom for the "effective" theory in low energies and low speeds. If there is any literature on that, I would highly appreciate it. I'll start with some background, and then I'll try to answer your question. | {
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javascript
let buffer = await render(page);
let originalPages = getPageAmount(buffer);
let maxPasses = 3;
let passes = 0;
await addPadding(page);
buffer = await render(page);
while(getPageAmount(buffer) !== originalPages && passes < maxPasses) {
await page.evaluate(
_ => ... | {
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quantum-algorithms, error-correction
For 1: If there is an argument saying that typically the number of $T$ gates is $\gg$ than the number of Clifford, I would be interested to hear about it.
For 2: I know that a logical identity is mathematically a Clifford operation. But I am not sure if they are taken into account ... | {
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ros, moveit, pcl, ros-kinetic, tf-broadcaster
Originally posted by PeteBlackerThe3rd with karma: 9529 on 2019-03-07
This answer was ACCEPTED on the original site
Post score: 1 | {
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cc.complexity-theory, np-hardness, open-problem, board-games
First, let's work instead with a game where pieces move orthogonally instead of diagonally. This game is equivalent (just look at the draughts board rotated 45 degrees) except for edge properties, which we will not use. We use two gadgets: merge / split and ... | {
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"tags": "cc.complexity-theory, np-hardness, open-problem, board-games",
"url": null
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climate-change
The drawbacks look small to me, and I also describe how they can be compensated. Are there any more?
So why is global warming bad? Global warming is colloquially referred to as the human-made warming of the climate that would not have otherwise occurred without the industrial revolution. The greenhouse... | {
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ros, ros2, colcon
and with --merge-install:
/usr/bin/c++ -DDEFAULT_RMW_IMPLEMENTATION=rmw_fastrtps_cpp -DPLUGINLIB__DISABLE_BOOST_FUNCTIONS -DROS_PACKAGE_NAME=\"rosbag2_transport\" -DSPDLOG_COMPILED_LIB -Drosbag2_transport_py_EXPORTS -I/usr/include/python3.8 -I/home/pi/ws/src/rosbag2/rosbag2_transport/include -isyste... | {
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"tags": "ros, ros2, colcon",
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magnetic-fields, sensor, electromagnetism
Nevertheless, all these should not be applicable in your case since your magnetic tag as you described it should have no more than a few mT, Br residual magnetism strength on contact. | {
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c#, asp.net, overloading
Note, your methods can throw a possible NullReferenceException if rfv is null, because you're reading its Enabled property and then checking if it's null or not. You're also setting its Enabled property after you've read it, which makes your workflow extremely confusing - it's not clear what h... | {
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In this light, what is important about the coproduct is not the object for which some arrows exist; it is the arrows themselves. So, if we are to leave anything out of the definition of coproduct, I would de-emphasize the objects:
A coproduct is a pair of injections $$i,j$$ into the same codomain which is moreover uni... | {
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"openwebmath_score": 0.9385839700698853,
"tags... |
game, functional-programming, scala, battle-simulation
override def toString : String = attackName + " attacks " + defendName
private def attack(attacker : Battler, defender : Battler) : Battler =
Battler(defender.name, defender.health - attacker.damage, defender.damage, defender.mentality)
}
case clas... | {
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# Divisibility rule
Example: $$2^1$$=2 --> $$2\mid2$$
If a number has their last digit divisible by 2, than the number is divisible by 2
$$2^2$$=4--> $$4\mid2$$, $$4\mid4$$
If a number has their last two digit divisible by 4, than the number is divisible by 4
$$2^3$$=8--> $$8\mid2$$, $$8\mid4$$ , $$8\mid8$$
If a ... | {
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"openwebmath_score": 0.7631581425666809,
"ta... |
# Documentation
### This is machine translation
Translated by
Mouseover text to see original. Click the button below to return to the English verison of the page.
# sec
## Syntax
• Y = sec(X)
example
## Description
example
Y = sec(X) returns the secant of the elements of X. The sec function operates element-wis... | {
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"openwebmath_score": 0.8237650394439697,
"tags": ... |
homework-and-exercises, kinematics, vectors, approximations
My two intimately related questions are:
1) What does he mean by the magnitude of velocity? is he talking about the magnitude of $v_1$, $v_2$ or $\Delta v$?
2)I have struggled a lot on my own, trying to figure out where this equation came from, but I didn't s... | {
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"openwebmath_score": null,
"tags": "homework-and-exercises, kinematics, vectors, approximations",
"url": null
} |
ros, android-core, gradle, android
com.android.ide.common.internal.LoggedErrorException: Failed to run command:
C:\Desenvolvimento\android-studio\sdk\build-tools\android-4.4\dx.bat --dex --output C:\Users\Bernardo\SkyDrive\www\arduino\ros\TheLorem-Brain\brain\build\pre-dexed\debug\xml-apis-1.0.b2-99724b73c87f7d301ef14... | {
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"tags": "ros, android-core, gradle, android",
"url": null
} |
haskell, assembly, brainfuck, compiler
Is it better to provide a Handle and write to it like I did, or maybe this function should just create Strings?
If the need arises, feel free to look at the code as a whole here. BfSource isn't Brainfuck, it's an intermediate language that's easier to work with. Don't worry abou... | {
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"tags": "haskell, assembly, brainfuck, compiler",
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beginner, f#, game-of-life
Console.ReadLine() |> ignore
let go() =
let size = 40
Console.WindowHeight <- size + 5
Console.WindowWidth <- size + 5
playGOL size size
That said I think both solutions suffer from a generation problem (I'm not a GOL-expert so I may be wrong):
As the image shows getLiving... | {
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"tags": "beginner, f#, game-of-life",
"url": null
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c, strings, reinventing-the-wheel
// tests: match middle, non-match, match begin, match end, empty string
char const *tests[] = { "for", "was", "This", "ion", "" };
for (size_t = 0; i < elements(tests); i++)
printf("%s\n", check(find_substr(input1, tests[i])));
printf("%s\n", check(find_substr("t... | {
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"tags": "c, strings, reinventing-the-wheel",
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sampling, lowpass-filter, filtering, analog-to-digital, resolution
So far so good, but I think i'm still not 100% confident of what is going on here:
How is the low pass filtering achieved? I know that I need to sample the input signal $4^n$ ($n$ = additional bits) times for every additional bit. After adding all sam... | {
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"tags": "sampling, lowpass-filter, filtering, analog-to-digital, resolution",
"url": null
} |
easier. An orthogonal matrix … Orth trick, it is an identity matrix, then the input matrix is an orthogonal matrix or.. Whether a matrix is an orthogonal matrix will be either +1 or -1 the Chrome Store. Stationary distribution of a the Chrome web Store are given the how to find orthogonal matrix is to use Privacy Pass ... | {
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"lm_q2_score": 0.8887587949656841,
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"openwebmath_score": 0.7539582252502441,
... |
entropy, work, reversibility, arrow-of-time
The second case (multiplication) increases entropy significantly. The first case ( addition) does not. Just an order of magnitude estimation.
Let $p$ and $q$ be primes of the form that you propose, and write $p = 2^N + p'$, $q = 2^M + q'$. Then $n = 2^{N + M} + p'2^M + q'2^N... | {
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"tags": "entropy, work, reversibility, arrow-of-time",
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} |
image-processing
Title: Image-processing - Dequantizer I begin to study how codec works, and I found a "summary-diagram" for DCT-codec (DCT stands for Discrete Cosine Transform). On this diagram, there are of course two steps: the encoding step and the decoding one. I try to make a reproduction of this diagram herebel... | {
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"tags": "image-processing",
"url": null
} |
neural-networks, reinforcement-learning, policy-gradients, deterministic-policy
I tried keeping the variance constant and updating the output with mean squared error loss and the target being the action it took. I thought this would end up pushing the mean towards actions with greater total rewards but it got nowhere ... | {
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"url... |
• Does $x_1+x_2-y_1-y_2\pm1$ , mean $x_1+x_2-y_1-y_2 + 1$ or $x_1+x_2-y_1-y_2 - 1$? – Mahidevran Feb 8 '16 at 20:09
• it can be any of them, depending on the relative order of ai and aj – Med Feb 8 '16 at 21:20
Here is a geometric definition. Perhaps it might appeal to you.
An $n$-simplex is an $n$-dimensional genera... | {
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"tag... |
Next stage: Since the up/down pattern seems to always consist of alternating up/down with some of the downs doubled, I systematically tried all such permutations to check if the pattern that the doubling occurs every $5$ steps persists. It does not; instead, what persists from $n=15$ to $n=35$ is that there are exactly... | {
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"lm_q1q2_score": 0.8202716974398752,
"lm_q2_score": 0.8333246035907933,
"openwebmath_perplexity": 1230.0420260421427,
"openwebmath_score": 0.7285186648368835,
"ta... |
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