text stringlengths 1 1.11k | source dict |
|---|---|
presented here is widely used in finance. (2017) Gradient superconvergence for a class of semi-cardinal interpolation schemes with cubic and quintic B-splines. For a function f(x) defined on the interval [a,b], either in functional or tabular form, cubic spline interpolation is the process of constructing (generally di... | {
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"openwebmath_score": 0.4604955315589905,
"tags": nul... |
ros
<disable_collisions link1="wrist_1_link" link2="wrist_3_link" reason="Never" />
<disable_collisions link1="wrist_2_link" link2="wrist_3_link" reason="Adjacent" />
<disable_collisions link1="gripper_ee_link" link2="shoulder_link" reason="Never"/>
<disable_collisions link1="gripper_ee_link" link2="forear... | {
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"url": null
} |
php, library
/**
*
* @return string
*/
function index() {}
/**
*
* @param string $msg
* @return string
*/
protected function error_page($msg = null) {
$err = '<span class="error">%s</span>';
return sprintf($err, $msg);
}
/**
*
*... | {
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"tags": "php, library",
"url": null
} |
c#, design-patterns, mvc
ErrorMessage.Getmessage(response.Response.Count(), "Participation Status", ref resultResponse);
return Ok(resultResponse);
}
else
return NotFound();
}
foreach (var keyValuePair in response.Exceptions)
{
... | {
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"tags": "c#, design-patterns, mvc",
"url": null
} |
electrostatics, electric-circuits, electrical-resistance, capacitance, dissipation
Title: If I charge 3 capacitors in series, then connect themin parallel, where does the remaining energy go? I'll get into the math straight away
$C_1, C_2, C_3$ each are charged to $q$. The energy is $$\frac{q^2}{2\left(\frac{1}{\frac{... | {
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"tags": "electrostatics, electric-circuits, electrical-resistance, capacitance, dissipation... |
have no calculator other than one that can do simple addition, subtraction, multiplication, or division. An Efficient Procedure to Evaluate the Taylor Polynomial Approximation T n (A) Algorithm (9) can be conveniently modified along the lines exposed in the previous section to. Fitzpatrick | All the textbook answers and ... | {
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"openwebmath_score": 0.874197244644165,
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python, python-3.x, algorithm, programming-challenge, linked-list
node: ListNode vs. node :ListNode.
But the real issue here is your inconsistency of placing whitespace, since you do it according to PEP8 in other places: self._add(node, head), key: int.
Docstrings
Docstrings belong right below the definition they are... | {
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"url": nu... |
# How to evaluate $\lim\limits_{x\to 0}\frac{e^{\arctan{(x)}}-xe^{\pi x}-1}{(\ln{(1+x)})^2}$?
How to evaluate $\lim\limits_{x\to 0}\frac{e^{\arctan{(x)}}-xe^{\pi x}-1}{(\ln{(1+x)})^2}$?
So I think we expand to $x^2$ since the lowest term for $\ln(1+x)$ is $x$
Let $u=\arctan{(x)}$
$\lim\limits_{x\to 0}\frac{e^{\arct... | {
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"openwebmath_score": 1.0000097751617432,
"tags... |
urdf, ros-melodic, xacro
Title: Xacro insert_block parameter
I was hoping to use the insert_block xacro capability to insert blocks as arguments to macros.
However, I can't figure out how to send blocks as parameters to xacros and there's not much documentation or examples that I can find.
Here's a simple example:
<x... | {
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"tags": "urdf, ros-melodic, xacro",
"url": null
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special-relativity, spacetime, metric-tensor, complex-numbers, wick-rotation
It was shown by some physicists, Einstein among them in the 1905 paper, that by introducing two quite reasonable postulates that essentialy lead to relaxing the hypothesis of absolute time, one would find new transformation rules between thes... | {
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"tags": "special-relativity, spacetime, metric-tensor, complex-numbers, wick-rotation",
"... |
differential equations with fuzzy linear homogeneous boundary conditions. The applications include:. Since the temperature at both ends is zero (boundary conditions), the temperature of the rod will drop until it is zero everywhere. boundary value problem with homogeneous boundary conditions to which one can applies th... | {
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"lm_q1_score": 0.9811668695588647,
"lm_q1q2_score": 0.8089347294893187,
"lm_q2_score": 0.8244619285331332,
"openwebmath_perplexity": 442.1441670526314,
"openwebmath_score": 0.8055364489555359,
"tags... |
trees, upper-bound
For each element in $\{L(\pi^{(d)}(x),d) : 0 \leq d \leq h(x)\}$ choose a representative $\pi^{(d)}(x)$ with the maximal $d$, and let $I$ be the set of all such $d$'s. In particular, if $\pi^{(d)}(x)$ is a representative then $L(\pi^{(d)}(x),d) \neq L(\pi^{(d-1)}(x),d)$, and so $\pi^{(d)}(x)$ has $d... | {
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"tags": "trees, upper-bound",
"url": null
} |
By inspecting graph in figure a below, you can see that is continuous, but you may have a hard time seeing the point where is not defined.
The function is defined by
(15.34)
so for , and for , and is not defined. We constructed by pasting together two parabolas. Figure b shows the two parabolas, one having a second... | {
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"tags": null,... |
algorithms, algorithm-analysis, numerical-algorithms, mathematical-analysis, iteration
Question 2: With your formulas, a bit of simplification gets you $v(t+dt) = v(t) + \frac{dt}{6}\left(5a(t) + 2ka_1 + 2ka_2\right)$ which is not coherent.
Even with the corrections I proposed, it is incorrect. My guess is that you sh... | {
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"tags": "algorithms, algorithm-analysis, numerical-algorithms, mathematical-analysis, iteration"... |
graph-theory, approximation
Title: Calculate sum of reciprocal rank in arbitrary large graph For arbitrary graph of n node, can I approximate $\sum_{v\neq u}\frac{1}{Rank_u(v)^a\times Rank_v(u)^b}$ with $\sum_{v\neq u}\frac{1}{Rank_u(v)^{a+b}}$ or not when n is large enough? $a,b>0$, $Rank_u(v)=k$ if v is the $k$th ne... | {
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"tags": "graph-theory, approximation",
"url": null
} |
quantum-mechanics, quantum-field-theory, energy, perturbation-theory, propagator
I would expect that the correct behaviour is 1), but this contradicts the fact that all books I've read always depict the threshold of pair production as an hyperboloid with its bottom sitting exactly at $(2m)^2$. On the other hand, if it... | {
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"tags": "quantum-mechanics, quantum-field-theory, energy, perturbation-theory, propagator",... |
python, beginner, web-scraping, beautifulsoup
Layer 3
Don't scrape! Some trivial googling reveals the E-Utilities API. This can much more narrowly target your use case, and is morally the "right thing to do" for a public service.
I demonstrate a functioning implementation that abides by the rate limitation constraints... | {
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ros, gazebo, ros2, camera
<collision>
<geometry>
<cylinder length="0.4" radius="0.05"/>
</geometry>
</collision>
</link>
<joint name="joint_3" type="fixed">
<parent link="link_2"/>
<child link="link_3"/>
<origin rpy="1.57 0 0" xyz="0.0 0.2 0 "/>
<dynamics damping="10" friction="1.0"/>
... | {
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"tags": "ros, gazebo, ros2, camera",
"url": null
} |
A good start is to look at $2^5-2$ because $x$ must divide it also :
$2^5-2=30=2 \cdot 3 \cdot 5$
You checked that $5 \mid n^5-n$ for every $n$ .
It's also clear that $2 \mid n^5-n$ because they have the same parity .
Finally :
$$n^5-n=(n^3-n)(n^2+1)$$ and from Fermat's theorem $3 \mid n^3-n$ so it also follows th... | {
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ros
Original comments
Comment by Martin Günther on 2014-01-26:
Nope, messages are initialized with default values (0.0 for floats, false for bools etc.) in their constructor. Other than that, this answer is correct (if you always re-initialize the msg, you'll always get the same results, so nothing moves).
Comment by ... | {
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machine-learning, regression, svr, rfe
I am not sure what this error means? RFE operates by fitting its estimator and then eliminating the worst feature(s), and recursing. The "worst" feature(s) are determined by using feature importance from the model, by default using either coef_ or feature_importances_ (as noted ... | {
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"tags": "machine-learning, regression, svr, rfe",
"url": null
} |
java, performance, graphics
}
if(x >= Game.WIDTH / 2 - 16 && x <= Game.WIDTH / 2 + 16 && y >= Game.HEIGHT / 2 - 16 && y <= Game.HEIGHT / 2 + 16){//wrong
//TODO render player
//TODO render equip
}
... | {
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"openwebmath_score": null,
"tags": "java, performance, graphics",
"url": null
} |
machine-learning, python, scikit-learn, pandas
What appears to happen is only the index gets shuffled and all other data stays the same. I have many columns in my pd dataframe where I would need to keep all rows the same. (randomly shuffle all rows, its time series data) If this is beneficial can someone give me a tip... | {
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"tags": "machine-learning, python, scikit-learn, pandas",
"url": null
} |
arduino, slam, navigation, hector
Title: hector slam and arduino help please
hi,
i install ros kinetic on raspberry pi3 and i configure kinect with hector slam and all work well.
now i want to implémante arduino to make a robot with 2 wheels, i install rosserial and i don't know how can i relate hector slam with ardu... | {
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c#
IMO that's a lot easier on the maintenance programmer.
But then CreateYear without the parameter is simply duplicating code, and you can eliminate it in favour of
private static readonly IEnumerable<MonthEnum> MonthsInYear = GetInRange(MonthEnum.January, MonthEnum.December);
Since you're not afraid to use arithmet... | {
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if x = A¡1y. We define invertible matrix and explain many of its properties. 1 The Invertible Matrix Theorem Let A be a square matrix of size N × N. The following statement are equivalent: • A is an invertible matrix. (d)Show that if Q is invertible, then rank(AQ) = rank(A) by applying problem 4(c) to rank(AQ)T. (e)Sup... | {
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"lm_q2_score": 0.8596637541053281,
"openwebmath_perplexity": 520.6749612818505,
"openwebmath_score": 0.81663715839385... |
gravity, experimental-physics, experimental-technique
Title: How does one get the value of acceleration of gravitation on earth accurately by experiment without electronic device? How does one get the value of acceleration of gravitation on earth accurately to 5 significant digits by experiment without electronic devi... | {
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"tags": "gravity, experimental-physics, experimental-technique",
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} |
c#, server, web-services, client, sharepoint
Calling the classes
using System.Linq;
namespace CallTaxonomyWebService
{
static class Program
{
private const string site = @"http://mysharepointsite/";
private static void Main(string[] args)
{
... | {
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"url": null
} |
catkin-make, cmake
So to fix that I installed Qt5 from the website. Now I had to manually change the CMAKE_PREFIX_PATH using CMAKE_PREFIX_PATH="$ENV{HOME}\qt5\5.5\gcc_64" to include qt5.
And then I tried again which gave me another error:
CMake Error at /opt/ros/indigo/share/genmsg/cmake/genmsg-extras.cmake:271 (messa... | {
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qiskit, error-correction, quantum-circuit, simulation, stim
encoder = stim.Circuit("""
H 0
CX 0 4
H 1
CZ 1 0
CY 1 4
H 2
CZ 2 1
CY 2 4
H 3
CZ 3 0
CZ 3 1
CX 3 4
""")
stabilizers = [
stim.PauliString("ZXZ_Y"),
stim.PauliString("_ZXZY"),
stim.PauliString("ZZ_XX")... | {
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"tags": "qiskit, error-correction, quantum-circuit, simulation, stim",
"url": nul... |
entomology, ecology, terminology
Title: Why is a mosquito feeding on human blood not a parasite? I recently read in my Ecology course notes that a mosquito feeding on human blood is not considered as a parasite. However, since it sucks blood from the human body, shouldn't it be regarded as a parasite, just like lice a... | {
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"tags": "entomology, ecology, terminology",
"url": null
} |
rosdep, macos, dependencies, macos-lion, osx
ROS path [1]=/Users/GCCS/fuerte_workspace/turtlebot
ROS path [2]=/Users/GCCS/fuerte_workspace/sandbox
ROS path [3]=/opt/ros/fuerte/stacks
ROS path [4]=/opt/ros/fuerte/share
ROS path [5]=/opt/ros/fuerte/share/ros
pointcloud_to_laserscan: Missing resource nodelet
ROS path [0]... | {
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"tags": "rosdep, macos, dependencies, macos-lion, osx",
"url": null
} |
java, bloom-filter
Title: Counting Bloom filter library in Java See also the next iteration.
This snippet is a counting Bloom filter supporting removal of elements as well. Instead of a bit vector it maintains a vector of "bucket counters". Also, the API supports well taking your customised hash functions.
Inserting: ... | {
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} |
newtonian-mechanics, newtonian-gravity, black-holes, escape-velocity
Yes (although you can never entirely escape from any object's gravitational field, so your wording needs to be tightened up). Escape velocity is simply the minimum velocity required to achieve an open ended trajectory (which is what I assume you mean... | {
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python, pandas
For each row with a specific country_ID, a similarly structured function is applied.
I would like to optimise or simplify the code of the country_ID_ENG function. The country_ID_ENG function is defined as follows:
def country_ID_ENG(df, i, list_ids):
# If it is the first time the ID is detected
... | {
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"tags": "python, pandas",
"url": null
} |
filters, equalization, quantization
Title: Quantizing a filtered signal In the process of trying to learn dialup, I've managed to learn/figure out everything except how to convert a demodulated/filtered signal back into the original data.
Here I have a random two-bit signal (red) sampled at 16000Hz at 2400 symbols/s (... | {
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"tags": "filters, equalization, quantization",
"url": null
} |
complexity-theory, time-complexity
Does this mean that their P complexity class contains only languages that are composed of yes-instances, i.e. languages recognised by $M$, consisted of $x$ strings such that $M$ always halts in accepting state for every of them as an input? What about input that also causes halting, ... | {
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"tags": "complexity-theory, time-complexity",
"url": null
} |
java, algorithm, traveling-salesman
@Override
public List<Point> getInitialPoints() {
return this.initialPoints;
}
}
SolutionHistory
public class SolutionHistory {
public void addStep(List<Point> currentSolution) {
for (Point point : currentSolution) {
System.out.println(poin... | {
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"openwebmath_score": null,
"tags": "java, algorithm, traveling-salesman",
"url": null
} |
java, json, gson
And finally, the packet would be converted from raw JSON to an instance of Packet using a custom Deserializer.
public class PacketDeserializer implements JsonDeserializer<Packet> {
@Override
public Packet deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context)
... | {
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"tags": "java, json, gson",
"url": null
} |
architecture, experimental-realization, optical-quantum-computing
Title: Physical qubit of optical quantum computer I was researching how optical quantum computers work and discovered a KLM protocol that allows for building quantum gates using linear optics elements like mirrors, beam splitters, and phase shifters. Ho... | {
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"tags": "architecture, experimental-realization, optical-quantum-computing",
"url"... |
java, optimization, design-patterns
Now if you need to change the syntax of your numbers, then you only have one defined place where you need to do it. For example to support the reciprocal:
static public double parseNumber(String number) {
if (number.charAt(0) == '~') {
return 1 / parseNumber(number.substring(1... | {
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"tags": "java, optimization, design-patterns",
"url": null
} |
ruby, ruby-on-rails, controller, chat
Here's a quick refactor of your code. There were some things that look broken about the code you have above (such as calling client.run_actions without ever setting client in the current scope), so I fixed some of those. That being said, the method fb_request wasn't in your posted... | {
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"tags": "ruby, ruby-on-rails, controller, chat",
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Splitting Algorithm : Find the convex hull of the point set {\displaystyle {\mathcal {P}}} and triangulate this hull as a polygon. Note that for each point of S there is one push and at most one pop operation, giving at most 2n stack operations for the whole algorithm. Hello everyone. Then at the k-th stage, we add the... | {
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"lm_q1_score": 0.95598134762883,
"lm_q1q2_score": 0.874628239582888,
"lm_q2_score": 0.9149009462917594,
"openwebmath_perplexity": 854.4457365825215,
"openwebmath_score": 0.45257630944252014,
"tags": null,
"... |
acid-base, nomenclature, coordination-compounds
Title: Can Hydronium Act as a Ligand? Can hydronium function as a ligand? For instance could there exist $\ce{[Al(H3O)4]^{+7}}$ or $\ce{[Fe(H3O)6]^{+9}}$ cations? I asked my chemistry teacher and he said that he's never encountered a coordination compound with cationic l... | {
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"openwebmath_score": null,
"tags": "acid-base, nomenclature, coordination-compounds",
"url": null
} |
classical-mechanics
The angular velocity $\omega$ is related to the angular displacement $\theta$ and time (t) by the ODE:
$$\frac{d\omega}{dt} = \alpha,$$
where $\alpha$ is the constant angular acceleration.
Now, let's express the radial acceleration $a_c$ in terms of $\theta$ and $t$. The relation between angular di... | {
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"tags": "classical-mechanics",
"url": null
} |
javascript, html, css, event-handling, dom
document.addEventListener('DOMContentLoaded', function() {
//store elements for use later - could use ES-6 keyword const instead of var
var h1Elements = document.getElementsByTagName('h1');
//add click handler to parent element - could also add to document.body
docum... | {
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"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "javascript, html, css, event-handling, dom",
"url": null
} |
python, beginner, python-3.x
word = AnalyzeWord(word)
sm = SequenceMatcher(None, self.phon, word.phon)
perc = int(sm.ratio() * 100)
print("Good rhyme - " + str(perc) + "%") \
if perc > 50 else print("Not a good rhyme - " + str(perc) + "%") | {
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"tags": "python, beginner, python-3.x",
"url": null
} |
c++, animation, sfml
return distribution(generator);
}
Now when you want a value between 0 - width you do
start = generateRandom(0, window.getSize().x)
This is a weird reimplementation of uniform_real_distribution. You did it so you could work with negative ranges because you want your snowflakes to start off-screen... | {
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"openwebmath_score": null,
"tags": "c++, animation, sfml",
"url": null
} |
c#, configuration, integration-testing
Automating database loading logic by reflecting on the configuration objects
Finally, if you want true magic and can make sure the configuration classes properties are named as in the database, you can automate LoadFromDatabase() with something like:
public static T LoadFromDatab... | {
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digital-communications, lowpass-filter, bandwidth, equalizer, pulse
With that in mind and specific to the OP's case of using a rectangular pulse, ultimately in any real-world system of finite energy, the pulse will be bandlimited. Further, when the channel is a shared resource, the metric of spectral occupancy drives ... | {
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"tags": "digital-communications, lowpass-filter, bandwidth, equalizer, pulse",
"url": null
} |
c++, recursion, template, c++20, constrained-templates
// is_recursive_invocable template function implementation
template<std::size_t unwrap_level, class F, class... T>
requires(unwrap_level <= recursive_depth<T...>())
static constexpr bool is_recursive_invocable()
{
if constexpr (unwrap_level == 0) {
re... | {
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"openwebmath_score": null,
"tags": "c++, recursion, template, c++20, constrained-templates",
"url": null
} |
quantum-mechanics, homework-and-exercises, quantum-information, linear-algebra
$$\vec{v} \cdot \vec{ \sigma }=\Sigma_i\lambda_i|i\rangle\langle i|\\
\exp(i\theta \vec{v} \cdot \vec{ \sigma })=\Sigma_i\exp(i\theta\lambda_i)|i\rangle\langle i|$$
where $\lambda_i$ are the eigenvalues of $\vec{v} \cdot \vec{ \sigma }$ and... | {
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"tags": "quantum-mechanics, homework-and-exercises, quantum-information, linear-algebra",
... |
$$\\\small{\text{ A:B= 5:6 ~~or~~ B=\dfrac{6}{5}A ~~or ~~ A=\dfrac{5}{6}B }}\\\\ \small{\text{ total mass of sugar in packet A and B: \qquad A+B= A+ \dfrac{6}{5}A = \dfrac{11}{5}A }}\\\\ \small{\text{ increase A = a \qquad a = 1.3\cdot A }}\\ \small{\text{ decrease B = b }}\\ \small{\text{ total mass of sugar in pack... | {
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"lm_q1q2_score": 0.8380755967388408,
"lm_q2_score": 0.853912747375134,
"openwebmath_perplexity": 1117.6168600578624,
"openwebmath_score": 0.21031787991523743,
"tags":... |
For a numeric equivalent let p be x = 4 let q be x^2 = 16
If x=4 then x^2=16 but it does not necessarily follow that If x^2=16 then x=4
Hence only the following are true:
• q whenever p
• q if p
• p is a sufficient condition for q
• p implies q
• q follows from p
• q is a consequence of p
• not p, or q
• not (p and ... | {
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"lm_q1q2_score": 0.8024913780263533,
"lm_q2_score": 0.8418256512199033,
"openwebmath_perplexity": 1107.6666660719816,
"openwebmath_score": 0.9553646445274353,
"ta... |
python, python-3.x, serialization, role-playing-game
if option in {"1", "S", "START"}:
nameInputAsk()
elif option in {"2", "L", "LOAD"}:
load()
nameInputAsk()
... | {
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"tags": "python, python-3.x, serialization, role-playing-game",
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} |
collision, stars, celestial-mechanics, neutron-stars
Or one a bit closer to home... the Giant Impact Hypothesis i.e. how long did it take, after the collision of Theia and 'Pre-Earth', for the current planet Earth (in terms of size, not atmosphere, water etc.) to form?
Mathematical reasoning, external sources etc. are... | {
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"openwebmath_score": null,
"tags": "collision, stars, celestial-mechanics, neutron-stars",
"url": null
} |
venus, natural-satellites
Title: If Venus had moon before and it fell back to Venus, why don't I see a unique, very big crater? Does lack of a very big crater support the idea that Venus never had big moons before?
If not, why can't I find a very big crater from the moon impact? Venus has volcanism and weather, and t... | {
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between the axis and. Lets say this new point's spherical coordinates in the new space will be (2 (distance), 1. Electric cranes Mathematical models Usage Oscillators Mechanical properties Models Oscillators (Electronics). cos T AB angle θ AB is the angle formed between the vectors and. Rectangular-to-Spherical Convers... | {
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"lm_q1_score": 0.9828232930001334,
"lm_q1q2_score": 0.8080666244464119,
"lm_q2_score": 0.8221891261650248,
"openwebmath_perplexity": 360.8178611992387,
"openwebmath_score": 0.8461831212043762,
"tags"... |
python, python-2.x, json, file-system
if pathname not in self.previous_state: return (0, 0)
dirs, files_with_sizes = self.previous_state[pathname]
total_size = sum(files_with_sizes.values())
total_num = len(files_with_sizes)
# Recursively visit all subdirs
for d in dirs:
... | {
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} |
ros, rosdep, update
Originally posted by tfoote with karma: 58457 on 2014-01-27
This answer was ACCEPTED on the original site
Post score: 1
Original comments
Comment by Kamiccolo on 2014-01-27:
Tried that, didn't work. sudo pip uninstall rosdep and sudo pip search rosdep told, that same rosdep 0.10.21 version is STIL... | {
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"tags": "ros, rosdep, update",
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gravity, magnetic-fields, field-theory
Title: what is the result of change in gravitational flux? As a change in magnetic flux results in induced EMF (electromotive force) likewise what is the result of a change in gravitational flux?
UPDATE: Gravitational flux according to me has only mathematical significance and no... | {
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"tags": "gravity, magnetic-fields, field-theory",
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• If you learn to reason by $\!\bmod$ as above then you don't have to remember motley divisibility formulas - they occur very naturally as special cases of general results (e.g. abobe that $\,(-1)^{2N} = 1)\ \$ – Gone Apr 17 '19 at 17:40 | {
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"openwebmath_score": 0.5675240159034729,
"tags":... |
reference-request, graph-theory, np-hardness, csp, homomorphism
There is only one other NP-hard oriented cycle with 26 vertices and it is just the above one with all edges reversed.
Could you verify with the top-bottom run (not sure what the definition is) criterion that this cycle is NP-hard? | {
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bash, awk
Leaf_T1_FD_R10_L001-ds.3b884c360b1e4ae185408a613b90a3bc]$ ls
Leaf-T1-FD-R10_S73_L001_R1_001.fastq.gz
Leaf-T1-FD-R10_S73_L001_R2_001.fastq.gz
I need all in fastq.gz format but the problem is that each sample, pair end R1 and R2 fastq reads in a single folder like this: and I need to extract all samples files... | {
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"tags": "bash, awk",
"url": null
} |
special-relativity, mass-energy, faq
It is a delightful document to read. There is no dramatic references to huge power release nor anything similar. He simply states after the derivation "If a body gives the energy away $L$ in form of radiation, then its mass decreases in an amount $L/V^{2}$ (...) the mass of a body ... | {
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"tags": "special-relativity, mass-energy, faq",
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python, python-3.x, game-of-life, generator
return [[table[x] for x in row] for row in grid]
def __init__(self, grid):
grid = list(filter(None, grid.split('\n')))
self.rows = len(grid); self.cols = len(grid[0])
if not all(len(grid[i]) == self.cols for i in range(self.rows)):
r... | {
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"openwebmath_score": null,
"tags": "python, python-3.x, game-of-life, generator",
"url": null
} |
phase, distillation
Title: overall energy and the boiling point i need help with the fractional distillation method of a couple of substances at least more than two substances , just like air actually what am i looking for is that why do substances in air with a low boiling point like nitrogen reach higher the fractio... | {
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"openwebmath_score": null,
"tags": "phase, distillation",
"url": null
} |
beginner, number-guessing-game, racket
(define NUM 12)
(define TRIES 6)
(define (num-message delta)
(cond [(< delta 0) "... Too low ..."]
[(> delta 0) "... Too high ..."]
[else "Correct! Well guessed!"]))
(define (guess-number target)
(let ([delta (- (read) target)])
(displayln (num... | {
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"tags": "beginner, number-guessing-game, racket",
"url": null
} |
c#, algorithm, recursion, time-limit-exceeded
Title: LeetCode - Weekly Contest 213 - Kth Smallest Instructions Hi I participated in Leetcode weekly contest 213 and am facing issue with submission for below question
Kth Smallest Instructions | {
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"tags": "c#, algorithm, recursion, time-limit-exceeded",
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turing-machines, reductions, undecidability, halting-problem
For $L_2$:
I want to reduce the halting problem $H = \{w\#x \mid M_{w}$ halts on $x\}$ to $L_2$ so I can prove that $L_2$ is undecidable. I had the idea of this function $f(<M>,x) \mapsto$ $<M'>\#w\#x$ where I put the input of $H$ into the function and get t... | {
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"openwebmath_score": null,
"tags": "turing-machines, reductions, undecidability, halting-problem",
"url": null
} |
cr.crypto-security, interactive-proofs, zero-knowledge
The verifier(s) can convince (every) other verifier by forwarding $\pi$ to the other verifier(s).
Unlike ZK protocols in the standard model, which have
deniability, NIZK proofs instead have transferability.
Related to NIZK but not otherwise related to your quest... | {
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"tags": "cr.crypto-security, interactive-proofs, zero-knowledge",
"url": null
} |
formal-languages, automata, regular-expressions
private static void test(String pattern, String str) {
System.out.println(str.matches(pattern));
Matcher matcher = Pattern.compile(pattern).matcher(str);
while(matcher.find())
System.out.println(str.substring(matcher.start(), matcher.end()));
}
The o... | {
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"openwebmath_score": null,
"tags": "formal-languages, automata, regular-expressions",
"url": null
} |
image-processing, computer-vision
Allocate your tree with the maximum number of features. Keep all the elements inserted. Whenever a new insert occurs, re-compute TF-IDF over the entire set.
Only keep the statistics which are required to update the weights. This way, an entire pass over the data is not necessary.
Nor... | {
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"id": 1901,
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"openwebmath_score": null,
"tags": "image-processing, computer-vision",
"url": null
} |
water, osmosis
Title: Can a long salt bath increase water retention? So it's Thanksgiving here in the states and an odd combination of things are on my mind. In the past day, I've
Brined a turkey whole, skin on
Taken a long epsom salt bath
(Same thing, right? What a turkey! Haha.)
Anyways, it got me wondering, can a... | {
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"openwebmath_score": null,
"tags": "water, osmosis",
"url": null
} |
ros, robot
Rename the current ~/catkin_ws to ~/old_catkin_ws with:
mv ~/catkin_ws ~/old_catkin_ws
Create the new catkin_ws from zero with:
cd
mkdir catkin_ws/src -p
cd catkin_ws/
catkin_make
The ROS Packages you create must be on ~/catkin_ws/src, so, if you want create a package named example_pkg that depends on ... | {
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "ros, robot",
"url": null
} |
graphs, algorithm-analysis, randomized-algorithms, random-graphs
Title: Given a simple graph G, what's the quickest known way to sample one of its spanning trees at random? Let's say I have a simple graph G with an edge set E, vertex set V, and at least 1 cycle.
We can determine the number of spanning trees in this gr... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "graphs, algorithm-analysis, randomized-algorithms, random-graphs",
"url": null
} |
python, predictive-modeling, training, confusion-matrix
Title: Export dataset with predicted target - Python I've this code (part of predictive model):
training_features, test_features, training_target, test_target, = train_test_split(df.drop(['target'], axis=1),
df['targe... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python, predictive-modeling, training, confusion-matrix",
"url": null
} |
java, datetime
Let Swing keep track of what it can
Swing can keep track of a lot of stuff. Explore the API. Your ScreenSaver is a JPanel. A JPanel is a JComponent. As such, it has font, foreground color and background color. You can just set the font and the color, and the Graphics object for the paintComponent() meth... | {
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "java, datetime",
"url": null
} |
general-relativity, differential-geometry, linearized-theory
or really as the douple connection acting on a tensor (the so-called "connection Laplacian" in math terminology), which would least a much longer expression like
$$\square h_{\alpha\beta}=g^{\mu\nu}\nabla_{\mu}\nabla_{\nu}h_{\alpha\beta}=g^{\mu\nu}(\partial_... | {
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"openwebmath_score": null,
"tags": "general-relativity, differential-geometry, linearized-theory",
"url": null
} |
organic-chemistry, bond, color, uv-vis-spectroscopy, light
P. D. Josephy, T. Eling, R. P. Mason, “The horseradish peroxidase-catalyzed oxidation of 3,5,3',5'-tetramethylbenzidine. Free radical and charge-transfer complex intermediates,” The Journal of Biological Chemistry 1982, 257(7), 3669-3675 (http://www.jbc.org/co... | {
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"openwebmath_score": null,
"tags": "organic-chemistry, bond, color, uv-vis-spectroscopy, light",
"url": null
} |
black-holes, entropy, information, hawking-radiation, black-hole-thermodynamics
Why is the Page time important, with respect to the total evaporation time given by the Hawking pioneer calculations?
Why is the Page time related to the so-called black hole scrambling of information? | {
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"tags": "black-holes, entropy, information, hawking-radiation, black-hole-thermodynamics",
... |
orbit, solar-system, pluto, neptune
It's very unlikely, because they're not on the same plane and they're not orbiting at the same period and they're currently in orbital resonance which they would need to fall out of to even have a chance, so it's a lottery ticket's chance of happening but it could theoretically happ... | {
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"id": 1080,
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the notes. Consequently, we call this the Lagrangean approach. Main Input: a non-convex black-box deterministic function Main output: an estimate of global optima The form of the input function need not be known (black box) and thus a user can pass a function that simply calls, for example, a simulator as the input fun... | {
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9728307653134904,
"lm_q1q2_score": 0.8106837997850292,
"lm_q2_score": 0.8333245911726382,
"openwebmath_perplexity": 1227.99381299854,
"openwebmath_score": 0.3481185734272003,
"tag... |
3. Jan 16, 2008
### EnumaElish
You can use differentiation to investigate the behavior of f. Say, the function is f(x) = x/2^x on x > 0. Then f'(x) = 2^-x (1 - x Log[2]), which has roots 1/Log[2] and +infinity. At x = 1/Log[2], f''(x) = 2^-x Log[2] (-2 + x Log[2]) is < 0, so you have the maximum. Note that f(x) > 0 f... | {
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9808759671623987,
"lm_q1q2_score": 0.8606959004408314,
"lm_q2_score": 0.8774767954920547,
"openwebmath_perplexity": 1352.996698281987,
"openwebmath_score": 0.6157326102256775,
... |
javascript, strings, formatting
Title: Simple ES6 Truncate method for character, word, and sentence limits Simple truncating method for characters, words, and sentences for a personal utility library I've been working on.
Improvements & criticism welcomed! Especially around default param usage, as I've not utilized it... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "javascript, strings, formatting",
"url": null
} |
c#, array, converting, byte
Title: Best way to convert the string with Byte sequence to Byte Array We had a string with byte array (hexadecimal) sequence, like: "0x65,0x31,0xb6,0x9e,0xaf,0xd2,0x39,0xc9,0xad,0x07,0x78,0x99,0x73,0x52,0x91,0xf5,0x93,0x1a,0x49,0xc6" and we need to recovery this sequence to byte array agai... | {
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"openwebmath_score": null,
"tags": "c#, array, converting, byte",
"url": null
} |
### Show Tags
16 Dec 2017, 08:53
1
KUDOS
stonecold wrote:
gmatexam439 wrote:
Sorry I am unable to find the existing thread for this question:
If 2,3,5 are the only prime factors of a positive integer p,what is the value of p?
A)p>100
B)p has exactly 12 factors including 1 and 12.
[Reveal] Spoiler: OA
C
.
[Reveal] Sp... | {
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"lm_q1_score": 0.9449947086083138,
"lm_q1q2_score": 0.8259983497465878,
"lm_q2_score": 0.8740772220439509,
"openwebmath_perplexity": 4768.193114812097,
"openwebmath_score": 0.49131280183792114,
"tags": ... |
quantum-mechanics, homework-and-exercises, wavefunction, hydrogen
Beware normalization always(your ket is normalized)
To get the expectation value you just "Bra Ket" your operator(if you think carefully you will realize that by this you just make a sum of all the possible values multiplied by their probabilities). | {
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"url": null
... |
There are 2 problems: 1st, the answer should be (5), and 2nd problem is that assuming that (3) is true, (1) is also must be true due to 0 eigenvalue. So, I made mistake somewhere.
## 2 Answers
The fact that $A^2 + 2A = 0$ implies that the minimal polynomial of $A$ divides $\lambda^2 + 2\lambda$. So the options for th... | {
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"lm_q1_score": 0.9637799399736477,
"lm_q1q2_score": 0.8072813160287473,
"lm_q2_score": 0.837619961306541,
"openwebmath_perplexity": 186.84235224434576,
"openwebmath_score": 0.9592797756195068,
"tag... |
c#
//Go to next morning
dateOfWeekLoop = dateOfWeekLoop.Date + new TimeSpan(8, 0, 0);
dateOfWeekLoop = dateOfWeekLoop.AddDays(1);
}
if(vr == null){
throw new Exception(string.Format("Couldn't calculate CutOff in {0} iterations", maxIterations));
}
DateTime co = dateOfWeekLoop.... | {
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"openwebmath_score": null,
"tags": "c#",
"url": null
} |
organic-chemistry, acid-base
So one is a little bit stronger than the other but it is not very much.
One could start to argue why exactly those two differ "so much" in strength but looking at those nine values above and the "noise" around the trend I guess that makes no sense. | {
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"tags": "organic-chemistry, acid-base",
"url": null
} |
time-travel
Person A1 invents a time machine and uses it to travel back in time.
Person A1 meets him-/herself (person A2) and changes the past in a way that person A2 no longer invents the time machine.
Paradox: Since person A2 didn't invent the time machine, person A1 cannot travel back in time to change the past.
E... | {
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"openwebmath_score": null,
"tags": "time-travel",
"url": null
} |
slam, mapping, laser, ros-noetic
[ WARN] [1693050243.373716031, 144.834000000]: dynamic reconfigure is not enabled for this image topic [image_raw] becuase <cameraName> is not specified
[ INFO] [1693050243.675149081, 144.834000000]: Laser Plugin: Using the 'robotNamespace' param: '/'
[ INFO] [1693050243.675501314, 144... | {
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"id": 38670,
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"tags": "slam, mapping, laser, ros-noetic",
"url": null
} |
• Take the logarithm (principal branch of the logarithm for each factor). See the series of logarithms converges to a complex number. – Daniel Fischer Jan 9 '15 at 17:50
• You want to use Hurwitz's theorem in complex analysis: if an infinite product of nowhere vanishing holomorphic functions on a region in the plane is... | {
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"lm_q1_score": 0.9674102514755852,
"lm_q1q2_score": 0.814390764945245,
"lm_q2_score": 0.8418256512199033,
"openwebmath_perplexity": 202.2178388113898,
"openwebmath_score": 0.9475816488265991,
"tags... |
javascript, node.js
main(); I would manipulate RegExp.lastIndex with the sticky flag to avoid slicing the source string:
function parseGame(text) {
const RX_HEADER = /!report Game Type:\s*(\d|\w+)(?:\s*(\w.*))?/y;
const RX_TEAM = /Team:\s*(\d+)/y;
const RX_DISCORD = /<@(\d+)>/y;
const RX_POSITION_DISCORD = /(\... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "javascript, node.js",
"url": null
} |
java, authentication, controller, servlets
Title: Simple login with jsp I made a simple login page with Java EE, jsp, servlet, tomcat and jdbc.
It does following:
login user
register user
after login it creates token for the session so ya can be directed from start page if ya have already login
you can remember your ... | {
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"openwebmath_score": null,
"tags": "java, authentication, controller, servlets",
"url": null
} |
turing-machines, universal-computation, charles-babbage
Gandy p. 55
I'm assessing the scope of Gandy's claim here. (Whether it is right or wrong). He seems to be stating that although Babbage seems to have stumbled onto a notion of Turing Completeness (can express any program using (1), (2) and (4) - he didn't have a ... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "turing-machines, universal-computation, charles-babbage",
"url": null
} |
matlab, python, noise-cancellation, lms
import pyaudio, wave, struct, math
import numpy as np
from matplotlib import pyplot as plt
import padasip as pa
## Variables Setup
mu = 0.1
MAXVALUE = 2**15-1 # Maximum allowed output signal value (because WIDTH = 2)
# Initialization of adaptive weight w
w = np.zeros(13)
# ... | {
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"tags": "matlab, python, noise-cancellation, lms",
"url": null
} |
statistical-mechanics, equilibrium, interactions, kinetic-theory
\begin{equation*}
\left\langle T\right\rangle =-{\frac {1}{2}}\,\sum _{k=1}^{N}{\bigl
\langle }\mathbf {F} _{k}\cdot \mathbf {r} _{k}{\bigr \rangle }
\end{equation*}
which is nothing more than the potential energy itself. | {
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"tags": "statistical-mechanics, equilibrium, interactions, kinetic-theory",
"url": null
} |
c++, performance, algorithm, pathfinding, c++20
And accessing the top element:
HeapNode<Node, Weight>* top_heap_node = OPEN_FORWARD.top();
OPEN_FORWARD.pop();
Node current_node = top_heap_node->getElement();
delete top_heap_node;
Now can be simplified to:
Node current_node = OPEN_FORWARD.top().getElement();
OPEN_FORW... | {
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"openwebmath_score": null,
"tags": "c++, performance, algorithm, pathfinding, c++20",
"url": null
} |
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