text stringlengths 1 1.11k | source dict |
|---|---|
homework-and-exercises, electric-circuits
The correct answer should be $\frac{V_0}{3R}$. First of all, when the switch is open a long time the voltage across the capacitor is not $V_0$. It is
$$V_{C}=V_{0}\frac{2R}{2R+R}=\frac{2}{3}V_{0}$$
That's because after a long time an ideal capacitor in a dc circuit looks like ... | {
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"url": null
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algorithms, computational-geometry
It seems like this is case of treating each point as the center of circle that is a member of an independent set in a geometric intersection graph, and then moving the points along the polygon boundary that they lie on such that the radius is maximized while keeping the set independa... | {
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"tags": "algorithms, computational-geometry",
"url": null
} |
fluid-dynamics, tensor-calculus, integration, continuum-mechanics
Title: Recasting integrals from Lagrangian to Eulerian frame Working on a research problem in the continuum mechanics of fluids. For clarity, uppercase will be used for tensors in the reference configuration, and corresponding spatial items will be in l... | {
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"tags": "fluid-dynamics, tensor-calculus, integration, continuum-mechanics",
"url": null
... |
python, hash-map
Title: Merge two list of dicts with same key I have two lists of dictionaries. Both lists always have the same ids.
I want to get the following result:
{9: {'av': 4, 'nv': 45}, 10: {'av': 0, 'nv': 0}, 8: {'av': 0, 'nv': 30}}
The following code is working but I wonder if this is the best solution?
l1 ... | {
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"tags": "python, hash-map",
"url": null
} |
audio, algorithms, phase
Title: Help me understanding this source code of a Phaser I tried to understand the following source code of a Phaser:
#define SR (44100.f) //sample rate
#define F_PI (3.14159f)
class Phaser{
public:
Phaser() //initialise to some usefull defaults...
: _fb( .7f )
, _lfoPha... | {
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"tags": "audio, algorithms, phase",
"url": null
} |
botany, plant-anatomy
User: Pengo, via Wikipedia CC BY-SA 3.0 2022.
The cotyledons are a part of the embryonic plant and whilst inside the seed capsule store energy in the form of starch (e.g. in oats and barley) and or fats/oils (e.g. in nuts). They are a distinct form from the mature leaves which grow as the plant m... | {
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"tags": "botany, plant-anatomy",
"url": null
} |
c++, recursion, file-system, logging, boost
Use constant string concatenation
The Snapshot routine currently has these lines:
outFile << "<!DOCTYPE html>\n";
outFile << "<meta charset=\"UTF-8\">\n";
outFile << "<html>\n";
outFile << "<title>" << sourcePathName << "</title>\n";
outFile << "<body>\n"; | {
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"tags": "c++, recursion, file-system, logging, boost",
"url": null
} |
species-identification, zoology, entomology
What can this insect be? (the length is around 4-5 cm) This looks like some kind of bagworm moth. Their larvae would use silk and plant debris to construct a protective case around themselves. It’s hard to tell the exact species unless you open up the case or wait for it to ... | {
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"tags": "species-identification, zoology, entomology",
"url": null
} |
ros, rate, frequency, publisher
How can i increase the publishing rate on /odom and /scan topics?
I have a P3AT robot in spawned in the simulated environment (USARSim).
////////////////////////////////////////////////Question Update 1///////////////////////////////////////
hi @gvdhoorn, i have an amcl node which subsc... | {
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ros, arduino, ros-kinetic, rosserial, rosserial-python
ros::NodeHandle nh;
std_msgs::UInt64 msgs;
ros::Publisher unnamed_publisher("empty_topic", &msgs);
bool publish_flag = false;
void intFunc()
{
msgs.data = millis();
publish_flag = true;
}
void setup()
{
nh.initNode();
nh.advertise(unnamed_publis... | {
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"tags": "ros, arduino, ros-kinetic, rosserial, rosserial-python",
"url": null
} |
optics, visible-light
Title: Elementary question about complementary colors I've recently read the following text on a Brazilian physics magazine:
In fall, tree leaves change color from green to yellow, orange and red. Green color comes from chlorophyll. In older leaves, chlorophyll production reduces and green tone ... | {
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"url": null
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simpler as 2√3. 20 terms. If you divide 98 by 2, you get 49. When n is an odd number, is a real number for all values of a. Always simplify if possible. This website uses cookies to ensure you get the best experience. Sometimes, after simplifying the square root(s), addition or subtraction becomes possible. $$\red{ \sq... | {
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"lm_q1_score": 0.9637799441350252,
"lm_q1q2_score": 0.8210950293208885,
"lm_q2_score": 0.8519528076067262,
"openwebmath_perplexity": 636.2207573290367,
"openwebmath_score": 0.8082594871520996,
"tags": nul... |
power-spectral-density, autocorrelation, signal-power, probability, probability-distribution-function
Title: Power Spectral Density from Probability Density Function The samples of a signal $x[n]$ are i.i.d. and follow a triangular pdf with $a = 0,\ b = 2,\ c = 1$: | {
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javascript
</div>
<div class='container'>
<div class="inputs">
<input type="text">
<input type="text">
<input type="text">
<input type="text">
<a href="#" class="copyBtn">
<img src="img/clipboard.svg... | {
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"url": null
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"tallest building". As noted previously, the second solution does not have a Laplace transform. 5 Displacement Control The Young-Laplace equation is a highly nonlinear PDE. ): More on Nonlinear Diffusion, Solutions of Compact Support: 25. They can be written in the form Lu(x) = 0, where Lis a differential operator. Lap... | {
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"lm_q1_score": 0.9871787842245938,
"lm_q1q2_score": 0.8204867835014967,
"lm_q2_score": 0.8311430478583169,
"openwebmath_perplexity": 631.7991365899385,
"openwebmath_score": 0.8082199096679688,... |
c++, template-meta-programming, c++17
// clang-format off
template <template <typename, typename> class Container, typename A, typename F,
// Enables this overload if the container's element type matches the output
// type of the callable:
typename = std::enable_if_t<std::is_same< A,
decltype(std::invoke(s... | {
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It also seems that some of the smaller cyclic subgroups sometimes occur as a subset of a larger cyclic subgroup. So in mod $$n=7$$, if $$a=3$$ and $$b=a^2\equiv2$$, then we have the containment $$\left<b\right>\subset\left<a\right>$$, where $$\left<b\right>$$ consists of half of the elements of $$\left<a\right>$$, name... | {
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9936116781444259,
"lm_q1q2_score": 0.8029050155190001,
"lm_q2_score": 0.8080672089305841,
"openwebmath_perplexity": 66.41001582374132,
"openwebmath_score": 0.9784016013145447,
"tags":... |
surface-chemistry
(I found several publications about high temperature oxidation, but none for surface oxidation at ambient conditions) First, a definition of the Langmuir unit, used in the graph in the question, which is not often run across except by vacuum (particularly UHV) folks. One Langmuir is the exposure of a... | {
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rosserial
In my msg body, include topic_id(7d 0) and msg_len(7 0 0 0) and following topic_name 'chatter'(63 68 61 74 74 65 72 ) and following std_msg/md5sum.
Is it the correct msg format for rosserial_python to create publisher?
$ rosrun rosserial_python serial_node.py tcp
[INFO] [WallTime: 1453776966.885414] ... | {
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beginner, career
Your background will help you because you are used to things like study design and execution and working with data. But I don't seen anything specific to HCI that would help you. When you are a good data scientist, the data itself takes on a muted importance. Right now, when I work on a project, I car... | {
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ros, ros-control, ros-kinetic, namespace
Originally posted by AndyZe with karma: 2331 on 2019-01-11
This answer was ACCEPTED on the original site
Post score: 1
Original comments
Comment by AndyZe on 2020-02-28:
Adding to my answer, for future sanity. The way ros_control works is:
A hardware_interface defines read/wri... | {
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java, parsing, tex
throw new ParseException(String.format("End of input reached while collecting value.%nText: %s", body));
}
/**
* Collects characters from the input stream until the first time the number
* of close characters seen is larger than the number of open characters.
*
* @param ... | {
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f⍨¨⍳
We apply f to each integer from 1 to the input, yielding an array.
Saved 12 bytes thanks to Dennis! | {
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terminology, evolutionary-algorithms, genetic-programming, grammatical-evolution, codon
To understand what a codon is, we need to understand what GE is, so let me first provide a brief description of this approach.
Grammatical evolution (GE) is an approach to genetic programming where the genotypes are binary (or inte... | {
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sensors, kalman-filter, sensor-fusion
covariance matrix of the robot state. We linearize the function $f$
using Taylor-series expansion to obtain a linear system. A linear
system can be easily solved using the Kalman Filter. Assume the
covariance of the estimate at time $t$ is $P_t$, and the assumed
covariance of the ... | {
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"tags": "sensors, kalman-filter, sensor-fusion",
"url": null
} |
newtonian-mechanics, general-relativity, gravity, free-fall
I know it's very arrogant to try to understand these situations without a lot of physical knowledge. But on this great site, I'm asking if someone can help me.
P.S.: Now let's assume that the spacecraft is accelerating the observer inside the spacecraft to g,... | {
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"url": null
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ros, ros-fuerte
</model>
</gazebo>
Launch file:
<launch>
<!-- start gazebo with an empty plane -->
<node name="gazebo" pkg="gazebo" type="gazebo" args="$(find ar_joint_controller)/model/empty_throttled.world" respawn="false" output="screen">
</node>
<!-- start gui -->
<node name="gazebo_gui" pkg="gazebo" type="gui"... | {
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F, B, A, D, C, E, G, I, H
Challenge
Given a list of integers $$\a\$$, your task is to determine whether there is a BST whose pre-order traversal prints exactly $$\a\$$.
Input
• A non-empty list of distinct positive integers $$\a\$$.
• Optionally, the length of $$\a\$$.
Output
• A truthy value if $$\a\$$ is the p... | {
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"ta... |
astronomy, galaxies, observable-universe
But what would we really see if we look at the opposite side from the galactic center (without a telescope or binoculars)? Would we see a black sky or a sky full of galaxies? Asimov's description is pretty much correct. There aren't many stars out there, so the night sky away ... | {
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entanglement, mathematics, textbook-and-exercises, density-matrix
My attempt 2
I also tried to utilize a reduced density matrix:
$$
\left| \psi \right> = \frac{1}{\sqrt{2}}\left|00\right> + \frac{i}{\sqrt{2}}\left|01\right> = \frac{1}{\sqrt{2}} \left( \left| 0\right>_A \otimes \left| 0\right>_B + i\left(\left| 0\right... | {
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We can iterate this idea to find a sequence of elements $y_i$. I define vertex sets $H_{k+1}', H_k$ and elements $y_{k+1} \in \Gamma(v) \cap H_{k+1}'$ such that $H_k' = H_k \cup \{y_k\} \cup H_{k+1}'$ inductively. Suppose we have found $y_{k} \in \Gamma(v) \cap H_{k}'$ and defined the sets $H_k, H_{k+1}'$. If $y_{k}$ i... | {
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"openwebmath_score": 0.8974928855895996,
"tag... |
Tsunami Model of Coupled Partial Differential Equations. If you continue browsing the site, you agree to the use of cookies on this website. First Order Linear Differential Equations How do we solve 1st order differential equations? There are two methods which can be used to solve 1st order differential equations. The ... | {
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"lm_label": "1. YES\n2. YES\n\n",
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"lm_q1_score": 0.992654173425523,
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"lm_q2_score": 0.8376199714402813,
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"openwebmath_score": 0.9188512563705444,
"t... |
python, python-2.x
Keep lines to a maximum 79 characters.
Comments are the only exception at 72.
Use snake_case for everything.
There are a few exceptions. The main one being classes which are CamelCase.
Just so you know, you are allowed to us full caps acronyms. UUIDManagment is a fine name.
Try to limit the amount o... | {
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} |
c++, beginner, array, sorting, integer
Format your code properly
A very important part of writing clean code is that it is formatted properly. As it is currently, your code is extremely tough to read. Simply using a site like this one
to format your code can help a lot
What goes into main()?
I would highly suggest you... | {
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either: as the inside of a simple 10-sided polygon perimeter boundary, as below. If the polygon can be drawn on an equally spaced grid such that all its vertices are grid points, Pick's theoremgives a simple formula for the polygon's area based on the numbers of interior and boundary grid points: the former number plus... | {
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"lm_q2_score": 0.8519528057272543,
"openwebmath_perplexity": 1421.7943427896078,
"openwebmath_score": 0.5987725257873535,
"tags"... |
web-scraping, rust
Notice that the par_iter call can now end simply with ? instead of .unwrap(), because our fn main returns a Result<_>.
new_urls = found_urls
.lock()
.unwrap()
.difference(&visited.lock().unwrap())
becomes now just (two unwraps gone!)
new_urls = found_urls
.lock()?
.difference(&*... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "web-scraping, rust",
"url": null
} |
# How to calculate variance of W? Find the probability distribution of W?
$W=Y-X$
I have figured out that $E(W)=0.3$ by using this formula $E(X+Y)=E(X)+E(Y)$.
I tried using the same formula with $E(X^2)$ and $E(Y^2)$ to find $E(W^2)$.
I also tried using $V(X+Y)=V(X)+V(Y)+2Cov(X,Y)$, but changing all the positive si... | {
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"openwebmath_score": 0.8963766694068909,
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reinforcement-learning, optimal-policy
I believe that the authors use the same notation to denote the state-value function $v$ that verify $v(s)=\mathbb{E}[G_{t}|S_{t}=s], \forall s \in S$ and the random variable $\mathbb{E}[G_{t+1}|S_{t+1}]$ but I'm not sure. I am not sure if it is standard notation, but Sutton & Bar... | {
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$$101x+11y+2z=313$$
where $$x,y,z$$ are numbers between $$0$$ and $$9$$.
If $$x\le 1$$, then $$101x+11y + 2z \le 101+11(9)+2(9)=101+13(9)=218$$
If $$x=2$$, then we have $$11y+2z=111$$
Since $$z\le 9$$, we have $$11y =111-2z \ge 93$$
Hence, we must have $$y=9$$. $$2z=111-11(9)=111-99=12.$$
Hence $$296$$ is a solut... | {
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"openwebmath_score": 0.940428614616394,
"tags"... |
c++, performance, c++11
// All combos should be in uppercase
std::transform(str.begin(), str.end(), str.begin(), toupper);
std::unordered_set<std::string> words;
std::vector<char> letters;
letters.reserve(str.size());
for(int i = 0; i < str.size(); ++i){
letters.push_back(str[i]);
}
... | {
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"tags": "c++, performance, c++11",
"url": null
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First of all: you answered the first question correct!
For your second question: let me denote the persons by person $A$ and person $B$. Suppose person $A$ goes first, then question 2a becomes: 'suppose person $A$ rolls in the first round and at most 3 rounds are played. What is the chance of $A$ winning?'.
Well: eit... | {
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"tag... |
ros-kinetic
Originally posted by stevemartin with karma: 361 on 2018-11-13
This answer was ACCEPTED on the original site
Post score: 1
Original comments
Comment by gvdhoorn on 2018-11-13:\
odom MUST be created automatically.
what do you mean by this? Without the plugin, Gazebo won't publish any odometry.
Comment by... | {
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quantum-field-theory, black-holes, event-horizon, antimatter, cpt-symmetry
Long story short, "mirror buddies", also known as "antiparticles" are absolutely and definitely particles with positive energy, the same as "ordinary particles", and they cannot spring into existence without a positive source of energy. (Let's ... | {
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"tags": "quantum-field-theory, black-holes, event-horizon, antimatter, cpt-symmetry",
"ur... |
electricity, electric-circuits, charge
My issue is with the usage of this term. Why use the term "referenced" ...I feel there must be some concept being expressed that is going over my head. And I have seen many articles that mention "ground referenced" this or that. And from what I gather the things mentioned are con... | {
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"tags": "electricity, electric-circuits, charge",
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general-relativity
So the questions is: does anyone know of an explicit example or a more convincing argument than "there are so many functions, there has got to be some that work"? Of course a reason why it doesn't work, if that is the case, would be good too.
Thanks. I believe that no such spacetime exists, if t... | {
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javascript, html, css, html5
Use function references
When you declare a function using function ticklePolarBear() { ... }, then ticklePolarBear is a function reference. Putting () behind that reference executes that function.
Why is this important? Well, you are using window.setInterval(..). Notice that you are declar... | {
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hash-function, near-neighbors
The subroutine you mention is for doing the above when you don't know t.
What the subroutine does is goes through each possible number of hash functions one may wish to concatenate for this particular query ($k$). For each such $k$, it looks at the size of the buckets containing the quer... | {
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cpu
As you can see from any PIC microcontroller architecture block diagram, 8-bit PIC microcontrollers have an accumulator called the "W register" connected exactly the same way.
The 8085 has an accumulator: "the only way to put a value into the accumulator is through the ALU." -- "Ken Shirriff: Reverse-engineering th... | {
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nuclear-physics, mass-energy, fusion, binding-energy, elements
Equivalently, the binding energy per nucleon behaves similarly.
As @cuckoo noted, iron and nickel have the most tightly bound nuclei; iron-56 having lowest mass per nucleon and nickel-62 having most binding energy.
This image (from Wikipedia) illustrates t... | {
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"tags": "nuclear-physics, mass-energy, fusion, binding-energy, elements",
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} |
terminology, definitions, philosophy, proofs, taxonomy
Title: Why there are only three machine learning paradigms: supervised, unsupervised, reinforcement? I read in books, blogs, and articles that there are three learning paradigms: supervised, unsupervised, and reinforcement.
However, I have never found a proof that... | {
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java, algorithm, strings
Second approach:
class StringRev2{
public static void main(String args[]){
String str[] = "He is the one".split(" ");
String finalStr="";
for(int i = str.length-1; i>= 0 ;i--){
finalStr += str[i]+" ";
}
System.out.println(finalStr);
}
} Stuff... | {
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"openwebmath_score": null,
"tags": "java, algorithm, strings",
"url": null
} |
newtonian-mechanics, collision, free-body-diagram, dirac-delta-distributions
At time $t=0$, a collision between G and B occurs. For the sake of simplicity, I assume that collision is elastic, and after the collision, B moves along $y$ with velocity $v$, while the rod remains steady.
During the collision, we observe im... | {
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"tags": "newtonian-mechanics, collision, free-body-diagram, dirac-delta-distributions",
"... |
species-identification, arthropod
Title: Help identifying a mite (?) I live in Cambridge, UK, and found these mites (probably? not sure) in the attic. There are no bird nests at or around the dwelling, and no traces of rats or mice. There are plenty of those and not clear what they feed on. Body is about 0.7-1mm long,... | {
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"openwebmath_score": null,
"tags": "species-identification, arthropod",
"url": null
} |
python, python-2.x, file, numpy, physics
Exception handling
Never use bare except clauses. You must know what kind of exception to expect before thinking about using a try. If you don't, then there is no need to try to recover from an "error" since you won't know how to handle said "error".
Even if you know which kind... | {
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of the samples. This idea is simplest to understand by looking at the example in the diagrams below. Motivation A simple local estimate could just count the number of training examples $$\dash{\vx} \in \unlabeledset$$ in the neighborhood of the given data point $$\vx$$. It is used for non-parametric analysis. The estim... | {
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"tags"... |
c#
Let us introduce a new method which just handles the check for the if statement.
private static bool HasIfStatement(string line)
{
return line.Trim().StartsWith("if ");
}
No we need a method to check for a then.
private static string[] spaceArray = new string[] { " " };
private static bool HasThenStatement(str... | {
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The question demonstrates the difference between expressions and functions. And the question of finding the maximal domain for a function determined of an expression depends on what one mean with the expressions in the formula. Either is $\sqrt x$ a function defined for $x\geq 0$ or it is an other function, defined for... | {
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waves, electromagnetic-radiation, astrophysics, telescopes, radio-frequency
That set of frequencies is known as "the water hole". This is also a useful set of frequencies because it is between two "obvious" radiators in space, OH and H, which combine to form water, which we assume everyone needs.
You can question any ... | {
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"u... |
To find the eigenvectors, we want to find $v$ such that $Av = \lambda v$ or $(A- \lambda I) v = 0$.
For $\lambda_1 = 0$, $(A- \lambda_1 I)v_1 = \begin{pmatrix}2 & 1 & -3\\4 & 2 & 3\\0 & 0 & 1\end{pmatrix} v_1 = \begin{pmatrix} 0 \\ 0 \\ 0 \end{pmatrix}$.
Row reduction yields
$$\begin{pmatrix}1 & \dfrac{1}{2} & 0\\0 ... | {
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java, performance, bitwise, tetris
underMask |= filled;
lneighborMask |= (filled << 1);
rneighborMask |= (filled >> 1);
foundHoles += setOnes[underMask & line];
foundHoles += setOnes[lneighborMask & line];
foundHoles += setOnes[rneighborMask & line];
}
return foundH... | {
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python, mongodb
You are composing the complete Portfolios-Object (including child-Models) first and then insert it into a collection. This seems fine and correct, but the fields PortfolioModels.id, PortfolioModels.portfolio_d, ModelScenarios.id and ModelScenarios.portfolio_model_id seem redundant, because the parent-c... | {
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Multinomial distribution calculator for probability statistics. Find the joint probability density function of the number of times each score occurs. Recall that since the sampling is without replacement, the unordered sample is uniformly distributed over the combinations of size \n\ chosen from \d\. The balls are then... | {
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"lm_q1_score": 0.9908743636887528,
"lm_q1q2_score": 0.8030827729118606,
"lm_q2_score": 0.8104789086703225,
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"openwebmath_score": 0.8619453310966492,
"tags": null,
... |
general-relativity, dirac-equation
For the first question, I am currently trying to calculate the adjoint, but did not get the terms to cancel yet. 1) Dirac operator Pseudo-Hermitian in flat and not pseudo-hermitian in curved space if you define it as in your first equation (without symmetrizing).
because $(i\gamma^a ... | {
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Interval Notation and Linear Inequalities 94 University of Houston Department of Mathematics For each of the following inequalities: (a) Write the inequality algebraically. Convert number to decimal notation. Asymptotic notations has following classes or notations for describing functions: O-Notation (Big Oh). Consider... | {
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homework-and-exercises, newtonian-mechanics, kinematics
Title: Calculate the acceleration of a moving elevator An elevator is moving down with uniform acceleration. A man inside the elevator who wants to measure the acceleration drops a coin as soon as the elevator starts. The coin is 6ft above the floor of the elevat... | {
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special-relativity, metric-tensor, acceleration, vectors, velocity
Then:
$$ (p^{\mu} +\delta p^{\mu})(p_{\mu} +\delta p_{\mu}) =
E^2 + 2E\delta E - (p^2 +2\vec p \cdot \vec p) = m^2 $$
Rearranging:
$$(E^2-p^2) + 2E\delta E - 2\vec p \cdot \vec p = m^2 $$
$$2E\delta E = 2\vec p \cdot \vec p $$
$$ \delta E = \frac{\vec... | {
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"tags": "special-relativity, metric-tensor, acceleration, vectors, velocity",
"url": null... |
ros-kinetic
Title: Unable to publish Marker array
Hi,
I am trying to publish Marker array of spheres. But when ever is tried
rostopic echo -n 1 /cir_visualization_marker.
The node is terminated giving an error
terminate called after throwing an instance of 'ros::serialization::StreamOverrunException'
what(): Buf... | {
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• @user156441: I said "WLOG", and note that I said "$R$" and not "$\mathbb{R}$". If $r \ne 0$, then we can scale $(p,q,r,s)$ so that $r$ becomes $1$, and then $\frac{p}{r} \in R$ implies that now $p \in R$. If $r = 0$, we can scale $(p,q,r,s)$ so that $p$ becomes $1$, and so now $p \in R$. I did not say that $p,r \in R... | {
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"tag... |
php, json
Title: Handling Medium-like text editor output at backend I'm a developer who has completed almost one year of full-stack development & learning. I published my very first package lately, and I don't know is my code good or bad. So I jumped down here.
EditorJS is block based medium-like rich text editor, so ... | {
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vcf, genomics
##GATKCommandLine=<ID=Mutect2,CommandLine="Mutect2 --alleles /add/2024-03-04_force_mutect/E200K.vcf.gz --output /add/2024-03-04_force_mutect/output//Ctrl4_E200K_frequency.vcf --intervals /add/2024-03-04_force_mutect/E200K.vcf.gz --input /add/2023-06-18_CJD_16_samples/312092_15-Ctrl4_H01_S11_R1_001.fastq.... | {
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"tags": "vcf, genomics",
"url": null
} |
Alpha and z^alpha values SVM kernel giving n+d\choose! Feature map of an RBF kernel required kernel you meant dot product, i.e how would show. For more information if there 's a hole in Zvezda module, why n't! It was n't clear whether you meant dot product or standard 1D multiplication \phi$ we define the corresponding... | {
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"lm_q1_score": 0.9669140216112959,
"lm_q1q2_score": 0.8218490458714182,
"lm_q2_score": 0.8499711737573762,
"openwebmath_perplexity": 1138.0306301152339,
"openwebmath_score": 0.8976481556892395,
"ta... |
image-processing, computer-vision
Implementation:
1. Find the label
The label is bright in front of a dark background, so I can find it easily using binarization:
src = Import["https://i.stack.imgur.com/rfNu7.png"];
binary = FillingTransform[DeleteBorderComponents[Binarize[src]]]
I simply pick the largest connected c... | {
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statistical-mechanics, condensed-matter, bosonization
If the simplest interaction is then cooked up in 1d for two fermions, derived in some way from whatever scheme I am attempting to prepare here, how can the theory be written as free bosons.
In this link in French (2.1.3), he starts from the following remark:
Ther... | {
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"tags": "statistical-mechanics, condensed-matter, bosonization",
"url": null
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forces, nuclear-physics, potential-energy, fusion, binding-energy
It did. Or rather, the composite system of the Earth, the ball, and their mutual gravitational field lost energy, which is equivalent to mass.
The question is how much energy. Suppose the combined mass of the ball-Earth system is $m_\text{earth} + m_\... | {
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... |
into smaller subproblems and build solution of larger problems from solutions of smaller problems. In the CLRS Introduction to Algorithms, for the rod-cutting problem during introducing the dynamic programming, there is a paragraph saying that. The key steps in a dynamic programming solution are. To understand why need... | {
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"openwebmath_score": 0.5176438689231873,
... |
\begin{array}{c} & f \\ \text{subset} & 1 & \text{good?} \\ \hline & 0 &\checkmark \\ 1 & 1 &\checkmark \\ \hline \end{array}
So $A_1=2$.
\begin{array}{c} & f \\ \text{subset} & 12 & \text{good?} \\ \hline & 00 &\checkmark \\ 1 & 10 &\checkmark \\ 2 & 01 &\checkmark \\ 12 & 11 \\ \hline \end{array}
So $A_2=3$.
\beg... | {
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"lm_q2_score": 0.8705972549785201,
"openwebmath_perplexity": 235.88007783621183,
"openwebmath_score": 1.0000098943710327,
"ta... |
c#, asp.net-mvc
Title: Update URL with new parameter value in controller action I have an action that takes an id as a parameter and gets the corresponding item with the help of a web service. The web service's method that returns the item will either return the item with the requested id, or will create a new item (n... | {
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"tags": "c#, asp.net-mvc",
"url": null
} |
# Solving equation II
#### anemone
##### MHB POTW Director
Staff member
Solve the equation $\left\lfloor \dfrac{25x-2}{4} \right\rfloor=\dfrac{13x+4}{3}$.
##### Well-known member
Solve the equation $\left\lfloor \dfrac{25x-2}{4} \right\rfloor=\dfrac{13x+4}{3}$.
Subtract 1 from both sides
$\lfloor\frac{25x-6}{4}\rflo... | {
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"lm_q1_score": 0.9865717444683929,
"lm_q1q2_score": 0.8424461961372663,
"lm_q2_score": 0.8539127548105611,
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"openwebmath_score": 0.730534017086029,
... |
ros, ros-melodic, abb
Loading 'move_group/ClearOctomapService'...
Loading 'move_group/MoveGroupCartesianPathService'...
Loading 'move_group/MoveGroupExecuteTrajectoryAction'...
Loading 'move_group/MoveGroupGetPlanningSceneService'...
Loading 'move_group/MoveGroupKinematicsService'...
Loading 'move_group/MoveGroupMoveA... | {
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"tags": "ros, ros-melodic, abb",
"url": null
} |
java, object-oriented, tic-tac-toe
But classes don't do something. They are something which is able to do something.
Magic numbers
Your code has some magic numbers. This are literal values with a special meaning like here:
for (int i = 0; i < 3; i++) {
for (int j = 0; j < 3; j++) | {
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"tags": "java, object-oriented, tic-tac-toe",
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ros-melodic
def on_release(self, key):
print('{0} release'.format(
key))
if key == Key.esc:
# Stop listener
return False
def keyboard_listener(self):
# Collect events until released
with Listener(
on_press=self.on_press,
on_release=self.on_release) as li... | {
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"openwebmath_score": null,
"tags": "ros-melodic",
"url": null
} |
np-complete, reductions, np-hard, np
If I'm pedantic, yes, B might be a little bit easier to solve than A. If the reduction is very expensive (takes a long time, or significantly increases the size of the problem instance), then B might be a lot easier to solve than A. Normally in study of NP-completeness we address... | {
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"openwebmath_score": null,
"tags": "np-complete, reductions, np-hard, np",
"url": null
} |
experimental-chemistry, ph
I plotted the graph of how $\mathrm{pH}$ increases with time for 6 temperatures (getting me 6 graphs), but I have difficulty finding out the relationship I have is linear or exponential. The current trend I have only seems to be linear from the $\pu{45 min}$ time period I performed my experi... | {
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"openwebmath_score": null,
"tags": "experimental-chemistry, ph",
"url": null
} |
machine-learning, neural-network, deep-learning, image-classification, image-recognition
Title: How to train a Model which can check whether image is from existing classes or not I have given an image dataset of 1000 classes, each class has 100 images. Now My requirement is to train a model which will take an image as... | {
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"tags": "machine-learning, neural-network, deep-learning, image-classification, image-re... |
physical-chemistry, quantum-chemistry, electrons, orbitals
\end{align}
For this you can easily seperate the $N$-electron problem into $N$ one-electron problems
\begin{align}
\hat{H} &= \sum_{i=1}^{N} \hat{h}_{i} \qquad \Rightarrow \qquad \Psi(\mathbf{r}_{1}, \ldots, \mathbf{r}_{N}) = \psi(\mathbf{r}_{1}) \cdots \psi... | {
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"tags": "physical-chemistry, quantum-chemistry, electrons, orbitals",
"url": null
} |
quantum-field-theory, spin-statistics, anyons
NB: There are some alternative proof of the SST linked from the Wikipedia page about it. I gave the link at the beginning of this question. | {
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"tags": "quantum-field-theory, spin-statistics, anyons",
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} |
c++, gui, c++17, snake-game, qt
FieldType Board::fieldTypeAt(std::size_t x, std::size_t y)
{
return mFields.at(y).at(x);
}
std::vector<std::vector<FieldType>> Board::initFieldWithWalls(
std::size_t width, std::size_t height)
{
std::vector<FieldType> row(width, FieldType::empty)... | {
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"tags": "c++, gui, c++17, snake-game, qt",
"url": null
} |
ros, navigation, 3d-navigation, ros-kinetic, 2d-mapping
The GPS is good enough that you could use the robot localization package instead of AMCL for locating. I make an assumption that you have encoders on the drive motors, and that you are using wheels. But even if you don't, it may be OK.
http://wiki.ros.org/robot... | {
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"tags": "ros, navigation, 3d-navigation, ros-kinetic, 2d-mapping",
"url": null
} |
openfermion
The problem is with the last line, which gives the following exception
TypeError: can only concatenate str (not "ABCMeta") to str
After examning the source code, I figured out that the problem is with the [operator * state][1]. Can anybody help to fix this? From the openfermion documentation (see here), i... | {
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} |
forces, classical-mechanics, angular-momentum, orbital-motion
However we can't solve this differential equation with the initial condition that the angular momentum is zero, i.e. the body is falling radially inwards, why isn't this orbit included in the differential equation? Just like @alephzero already mentioned, th... | {
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"tags": "forces, classical-mechanics, angular-momentum, orbital-motion",
"url": null
} |
c, hash-map, c89
Spell check
/* `key` and `map` cannot bu null. Null pointer cause UB */
^
Use stdbool.h
Do not code unconditionally bool, false, true.
// typedef enum { false = 0, true = 1 } bool;
#include <stdbool.h>
Other applications: Generalizing x*alloc()
Consider clear defined beha... | {
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"tags": "c, hash-map, c89",
"url": null
} |
c++, algorithm, matrix
Having 3, 4, 5 points united in one if statement we get the area which marked as cyan triangle where we should be looking for max element(red circle).
Thanks in advance:) Everybody have a great day. Create a class Matrix
Instead of passing around vectors of vectors, consider creating a class Mat... | {
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In general, for any $$n\times n$$ matrix $$A=(a_{i,j})_{i,j=1,\ldots,n}$$ the expression $$\sum_{i,j=1}^na_{i,j}x_iy_j$$ defines a bilinear form, which will be symmetric if and only $$A$$ is. Giving a positive definite symmetric bilinear form is a more subtle condition that leads to inequalities for the coefficients of... | {
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"lm_name": "Qwen/Qwen-72B",
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"lm_q1q2_score": 0.8466250934216157,
"lm_q2_score": 0.863391599428538,
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"openwebmath_score": 0.9553616046905518,
"tag... |
6. Originally Posted by Soroban
Hello, clockingly!
This is how I was taught to find the intersection of two planes.
We have: . $\begin{array}{cccc}2x - y + z & = & 5 & {\color{blue}[1]}\\ x + y -z & = & 1 & {\color{blue}[2]}\end{array}$
Add [1] and [2]: . $3x \,=\,6\quad\Rightarrow\quad x\,=\,2$
Substitute into [2]... | {
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"openwebmath_score": 0.8964012861251831,
... |
\begin{equation*} x = \Delta x_1 + \Delta x_2. \end{equation*}
We can write the equations of motions of the block and point P between the two springs.
\begin{align*} \amp \text{Block: }\ \ m a_x = -k_2\,\Delta x_2,\\ \amp \text{Point P: }\ \ k_1\Delta x_1 = k_2\,\Delta x_2, \end{align*}
Eliminating $\Delta x_1$ and ... | {
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"lm_q2_score": 0.8459424314825852,
"openwebmath_perplexity": 780.150730698728,
"openwebmath_score": 0.8359076380729675,
"ta... |
species-identification, zoology, entomology
Title: What is this insect (Egypt)? I am from Egypt, and I found this insect in my house. It's slow when it moves, and I didn't see it fly. It's green (my phone camera didn't get the colors right).
This is some species of aphid.
Most people are familiar with the wingless s... | {
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"openwebmath_score": null,
"tags": "species-identification, zoology, entomology",
"url": null
} |
javascript, jquery, design-patterns
var person = (function () {
//the ajax object will be passed and shared between
//the functions here (type and dataType dont change in this example)
var ajax = {
type: "POST",
url: "",
... | {
"domain": "codereview.stackexchange",
"id": 4995,
"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, jquery, design-patterns",
"url": null
} |
see Centroid of a triangle. Note: When you're given the centroid of a triangle and a few measurements of that triangle, you can use that information to find missing measurements in the triangle! If $(0,0)(a,0)(a,b)$, $G=(\frac{2a}3,\frac{b}3)$ Also, a centroid divides each median in a 2:1 ratio (bigger part is closer t... | {
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"lm_q1_score": 0.9833429629196683,
"lm_q1q2_score": 0.815131150087213,
"lm_q2_score": 0.8289388146603365,
"openwebmath_perplexity": 264.23028849168526,
"openwebmath_score": 0.73389297723... |
ros, ros-melodic, add-dependencies
Also, when running catkin_create_pkg and adding dependencies as the package is being created, are the dependencies simply the name of the package OR the the correct dependency name found somewhere else ?
this is a different question than "does catkin download dependencies" and shoul... | {
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"tags": "ros, ros-melodic, add-dependencies",
"url": null
} |
javascript
Consider the image above, The x axis and y axis are defined as a 2D vector each with an X and y magnitude that usually defines the size of a pixel. The origin defines where in screen space the coordinate 0,0 will appear.
You can define the axis as a matrix
const projection = [
1, 0.5, // direction and ... | {
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