text stringlengths 49 10.4k | source dict |
|---|---|
electromagnetism, quantum-field-theory, hamiltonian-formalism
Title: To what extent is the "minimal substitution" or "minimal coupling" for the EM vector potential valid? In all text books (and papers for that matter) about QFT and the classical limit of relativistic equations, one comes across the "minimal substituti... | {
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"openwebmath_score": null,
"tags": "electromagnetism, quantum-field-theory, hamiltonian-formalism",
"url": null
} |
javascript, performance, typescript
// se l'orario corrente è maggiore di quello limite aggiungo 24 ore alla data corrente
curDate.setHours(
curDate.getHours() + this.negozioSetup.oreMinimeAsporto + 24
);
}
} else {
// orario limite disabilitato proseguo con ... | {
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"openwebmath_score": null,
"tags": "javascript, performance, typescript",
"url": null
} |
beginner, c
For the edge function I admit the padding with 0 ... I found on stackoverflow, ... I just used the idea. Is it a bad practice or something that is usually done?
There are a few concerns here:
Can you legally copy stuff from SO? I'll link you to an answer that can explain better than I can: https://meta.... | {
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"tags": "beginner, c",
"url": null
} |
quantum-mechanics, electromagnetism, quantum-field-theory, lagrangian-formalism
$$
e^2 J^j(x)\frac{\delta_{jk}+r_j r_k/r^2}{r}J^k(y)
\tag{11}
$$
with $\vec r=\vec x-\vec y$. Insofar as the (quantum) particle has any well-defined location and velocity, the current $J(x)$ is proportional to the velocity and $x$ is the ... | {
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"openwebmath_score": null,
"tags": "quantum-mechanics, electromagnetism, quantum-field-theory, lagrangian-formalism",
... |
quantum-mechanics, quantum-information, quantum-computer, decoherence
Title: Eigenvalues of density operator under quantum channel Consider a 2x2 density operator $\rho$ with eigenvalues $\lambda_{1},\lambda_{2}$ (where $\lambda_{1}\geq\lambda_{2}$) evolving into a 4x4 density operator $\rho'$ (with eigenvalues $\lamb... | {
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"tags": "quantum-mechanics, quantum-information, quantum-computer, decoherence",
"url": n... |
fluid-dynamics, astrophysics, plasma-physics, shock-waves, solar-wind
Yes, a contact discontinuity is a stagnation point where no mass flux or flow go across some boundary. In plasmas, the stagnation point is actually formed by something called a tangential discontinuity. The jump conditions for these are:
$$
\begin... | {
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"tags": "fluid-dynamics, astrophysics, plasma-physics, shock-waves, solar-wind",
"url": n... |
python, performance, python-3.x, calculator
Title: Python program for a simple calculator I have written a program for a simple calculator that can add, subtract, multiply and divide using functions.
Here is my code:
# This function adds two numbers
def add(x, y):
return x + y
# This function subtracts two number... | {
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"tags": "python, performance, python-3.x, calculator",
"url": null
} |
python, python-3.x, formatting, fixed-point
which I think looks even nicer. I also replaced the outer ' with " so one does not have to escape the inner ' with backslashes.
The last error message could use the same tricks and could also utilize implicit line continuation in function parenthesis instead of manual line c... | {
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"openwebmath_score": null,
"tags": "python, python-3.x, formatting, fixed-point",
"url": null
} |
array, vba
For AryCounter = 11 To 0 Step -1
If EndDay > MonthSet(AryCounter) Then
EndWeekStartDate = CDate(AryCounter + 1 & _
"/" & EndDay - MonthSet(AryCounter) & "/" & EndYear)
EndWeekEndDate = EndWeekStartDate + 6
If Month(EndWeekStart... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "array, vba",
"url": null
} |
javascript, ecmascript-6, api, ajax
Education (institutions, coursework, etc.)
============================================
*/
.institution {
margin-top: 20px;
}
/* Course and award container */
.institution-info {
display: grid;
/* Mobile first: only one column. Changes to two columns on bigger scre... | {
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"openwebmath_score": null,
"tags": "javascript, ecmascript-6, api, ajax",
"url": null
} |
Find all School-related info fast with the new School-Specific MBA Forum
It is currently 26 Jul 2016, 00:47
### GMAT Club Daily Prep
#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.
C... | {
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"lm_q2_score": 0.865224073888819,
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"openwebmath_score": 0.7749797701835632,
"tags": null,... |
electromagnetism, forces, lagrangian-formalism, potential, potential-energy
Title: Deriving the Lorentz force from velocity dependent potential We can achieve a simplified version of the Lorentz force by
$$F=q\bigg[-\nabla(\phi-\mathbf{A}\cdot\mathbf{v})-\frac{d\mathbf{A}}{dt}\bigg],$$
where $\mathbf{A}$ is the magnet... | {
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"tags": "electromagnetism, forces, lagrangian-formalism, potential, potential-energy",
"ur... |
To show that $1$ is not even:
I assume you can prove or accept that $a \cdot 0 = 0$ for all $a \in \mathbb{Z}$, the product of a positive and negative number is negative, and $2a > a$ when $a >0$.
If $1$ is even, then there must exists $a < 1$ such that $2a = 1$. However, the only $a < 1$, which is an integer, is $0$... | {
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"lm_q2_score": 0.8723473813156294,
"openwebmath_perplexity": 101.67144073735894,
"openwebmath_score": 0.9559515714645386,
"ta... |
quantum-mechanics, angular-momentum, conservation-laws
Title: Angular momentum conservation in Quantum Mechanics, how does it work? In Classical Mechanics it is "easy", if some system has some angular momentum at the beginning then conservation of angular momentum means that no matter what happens, the angular momentu... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "quantum-mechanics, angular-momentum, conservation-laws",
"url": null
} |
Clearly $f(x)\ne g(x)=f(x+)$ implies that $f$ is not continuous at $x$. By the above result, there is only countably many such points.
-
By result that Martin said $g$ is continuous except at a contable set $C$ and in $[a,b) \backslash C, \ g(t) = f^{+}(t) = f^{-}(t)= f(t)$ . Hence in $C$, $g$ is càdlàgle se $t \in C... | {
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"lm_q2_score": 0.8376199592797929,
"openwebmath_perplexity": 115.31765903948076,
"openwebmath_score": 0.9311806559562683,
"ta... |
python, beginner, programming-challenge, time-limit-exceeded, primes
def pred_a(idx, lst, *extras):
tpl, val = [None, None], lst[idx],
if extras: a, b = extras[0], extras[1]
tpl[0] = a <= val < b
if val > b: tpl[1] = 1
elif val < a: tpl[1] = -1
return tuple(tpl)
def get_total_primes(a, b)... | {
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"openwebmath_score": null,
"tags": "python, beginner, programming-challenge, time-limit-exceeded, primes",
"url":... |
c, generics, collections, hash-map, set
\
for (PFX##_iter_new(&iter, _set_); !PFX##_iter_end(&iter);) \
{ \
PFX##_iter_next(&iter, &result, &index); ... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c, generics, collections, hash-map, set",
"url": null
} |
java, swing
It's for the most part just a giant container that organizes the
various stats and container classes, the only thing I could think of
doing is making some larger containers to group things in, like a
Skills or Sleights class?
That's some start, but read on for more pointers.
Currently it's hard to ... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "java, swing",
"url": null
} |
java, matrix, mathematics
Matrix res = matrix1.multiply(matrix2);
assertEquals(expected, res);
} | {
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"openwebmath_score": null,
"tags": "java, matrix, mathematics",
"url": null
} |
c#, .net-core
This
if (caption != null | menu != null | status != null)
will check every condition although it would be enough if one condition would be true.
Passing the frameCharacter to WriteHorizontalFrame(), WriteCaptionMessages, WriteMenuMessages() and WriteStatusMessage() would make the field frameCharacter ... | {
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"openwebmath_score": null,
"tags": "c#, .net-core",
"url": null
} |
performance, vba, excel, formatting
newText(newTextIndex) = ch
End If
Next
convertExponentsToSuperScript = Join(newText, "")
End Function
Test Code
Sub TestConvertExponentsToSuperScript()
Dim target As Range
Dim results As Variant
Set target = Selection ' getTestRange(10000)
results =... | {
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"openwebmath_score": null,
"tags": "performance, vba, excel, formatting",
"url": null
} |
combinatorics, dynamic-programming, efficiency
It works fine but i consider this approach to be too slow from algorithmic point of view. It requires roughly $O(N^2 S)$ operations.
So here's my question. Can this computation be done faster? Perhaps via some other recurrence or some smarter way to fill the dynamic progr... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "combinatorics, dynamic-programming, efficiency",
"url": null
} |
electrochemistry
Title: I am using my phone as hotspot. What is the best charging strategy to maximize the lifespan of the battery? This question could have been asked in Electrical Engineering SE, but I think it is more related with chemistry. It might be a Physics question too. If that is the case I will ask it over... | {
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"id": 16055,
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "electrochemistry",
"url": null
} |
arduino, navigation
\mbox{Turn Angle} = 0 - (-1.5708) \\
\mbox{Turn Angle} = +1.5708 = +90^o \\
$$
The distance you need to travel after turning $\mbox{Turn Angle}$ is given by:
$$
\mbox{distance} = \sqrt{dX^2 + dY^2} \\
\mbox{distance} = \sqrt{(300)^2 + (0)^2} \\
\mbox{distance} = \sqrt{(300)^2} \\
\mbox{distance} = ... | {
"domain": "robotics.stackexchange",
"id": 797,
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "arduino, navigation",
"url": null
} |
java, game, community-challenge, pathfinding
private final GridPoint mStart;
private final GridPoint mGoal;
private final Map<GridPoint, GridPoint[]> mMap = new HashMap<>();
public MoveMap(final GridPoint start, final GridPoint goal, final GridPoint baseVelocity,
final G... | {
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"tags": "java, game, community-challenge, pathfinding",
"url": null
} |
# Distribute 11 fish to 4 persons, where each person should have at least 1 fish and the fishes are not all identical
I have a problem that I have not been able to find a solution to:
There are 9 black fishes, 1 yellow fish and 1 blue fish that are to be given to four (distinct) persons. Each person should have at le... | {
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"lm_q1_score": 0.9777138151101525,
"lm_q1q2_score": 0.8104649247767947,
"lm_q2_score": 0.8289388083214155,
"openwebmath_perplexity": 483.3198356580069,
"openwebmath_score": 0.6462223529815674,
"tag... |
lagrangian-formalism, hamiltonian-formalism, hamiltonian, constrained-dynamics
Title: Why does the Hamiltonian of a Lagrangian that consists of only a coupled term become zero? Let's say our Lagrangian looks something like this:
$$L = \int dz\, Q\cdot \dot{A},\tag{1}$$
where $Q$ and $A$ are two generalized coordinates... | {
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"openwebmath_score": null,
"tags": "lagrangian-formalism, hamiltonian-formalism, hamiltonian, constrained-dynamics",
... |
machine-learning, classification, tensorflow, image-classification, audio-recognition
Title: Machine learning classification with time-domain signals how to ignore signal arrival time? I am training a Tensorflow classifier model with signal data (converting signals to the spectrograms).
I want the model to be insensit... | {
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"id": 9049,
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"lm_q1_score": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "machine-learning, classification, tensorflow, image-classification, audio-recog... |
electromagnetism, thermodynamics, electric-circuits, entropy, superconductivity
Title: Why don't superconductors, which have zero electrical resistance, violate the second law of thermodynamics? There are bunch of questions on here asking whether superconductors really have exactly zero resistance and answers saying t... | {
"domain": "physics.stackexchange",
"id": 93633,
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "electromagnetism, thermodynamics, electric-circuits, entropy, superconductivity",
... |
c#, wpf, xaml
XAML
<Window x:Class="ExtraOefLabo.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.... | {
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"openwebmath_score": null,
"tags": "c#, wpf, xaml",
"url": null
} |
homework-and-exercises, electromagnetism, electric-fields
$$
\vec k\cdot\vec r=k_x x+k_y y + k_z z.
$$
Both forms are equivalent, so you could equally well read
\begin{align}
E_x&= E_{0x} \exp{\left[i\left(\vec k\cdot\vec r-\omega t\right)\right]}\\
E_y&= E_{0y} \exp{\left[i\left(\vec k\cdot\vec r-\omega t\right)\righ... | {
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"openwebmath_score": null,
"tags": "homework-and-exercises, electromagnetism, electric-fields",
"url": null
} |
wavelet, r
\phi_1 &= a_{-1}s_3 + a_0 s_2\\
\vdots\\
\phi_{2^{j-1}-1} &= a_{-1}s_{(2^j-1)} + a_0 s_{(2^j-2)}.\\
\end{split}
\end{equation}
Consider a signal $S$ of length $n=1024=2^{10}$ $(j=10)$, and assume Haar scaling function values of $a_{-1}=a_0=0.5$. Although the length of $S$ is 1024, the notation used to repr... | {
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"openwebmath_score": null,
"tags": "wavelet, r",
"url": null
} |
Figure 6.3.11 illustrates the constraint that $g(x)$ must be greater than 0. The first pane in Figure 6.3.11 shows GC’s graphs of $y=x^2$ and $y=e^{\ln(x^2)}$ being identical. The second pane shows that GC’s graphs of $y=\sin(3x)$ and $y=e^{\ln(\sin(3x))}$ are identical only for values of x such that $\sin(3x)>0$.
(a... | {
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"lm_q2_score": 0.8311430478583168,
"openwebmath_perplexity": 486.6490195661937,
"openwebmath_score": 0.9101719856262207,
"tags":... |
machine-learning, loss-function, probability, activation-function
Title: Training set Distribution and Activation function/Loss function correlation How should the probability distribution of the training set influence the choice of the activation function / loss function?
For instance if I have a Multinoulli distrib... | {
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"tags": "machine-learning, loss-function, probability, activation-function",
"url": nu... |
c++, beginner, object-oriented, strings
iterator end();
const_iterator end() const;
String &operator+=(const String &s);
int compare(const String &str) const;
~String();
private:
size_type data_size;
iterator data; // points to the first char
int *ref_cnt;
};
void swap(String &first, St... | {
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"url": null
} |
## 1 Answer
Hint: Bell numbers are defined by $$B_{n+1}=\sum _{k=0}^n\binom{n}{k}B_k,B_0=1$$ Call the set of partitions of $$[n]=\{1,\cdots ,n\}$$ by $$P([n])=\{\pi:\pi \vdash [n]\}.$$ So consider the following function $$\varphi :P([n+1])\longrightarrow \bigcup _{k=0}^n\binom{[n]}{k}\times P([n-k]),$$ defined as $$\v... | {
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"lm_q1_score": 0.9719924818279465,
"lm_q1q2_score": 0.8202596970424817,
"lm_q2_score": 0.8438951045175643,
"openwebmath_perplexity": 139.0541785448334,
"openwebmath_score": 0.8692259192466736,
"tag... |
java, networking, netty
Title: Netty multi-connection packet handling On my free time, I was working on a system that could help some little private companies, like game servers, etc.
The last few days I have been working in such small companies, and I noticed that some of them give direct access to their developers t... | {
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ros, gazebo7, ros-kinetic
Originally posted by Caesar84 on ROS Answers with karma: 26 on 2018-04-01
Post score: 0
solved, by adding the line <arg name="world_name" value="/home/mastlab/2.world"/> to the launch file so it will be :
<include file="$(find gazebo_ros)/launch/empty_world.launch">
<arg name="paused" valu... | {
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"tags": "ros, gazebo7, ros-kinetic",
"url": null
} |
c++, playing-cards
Could the two to_string()s for Rank and Suit be shortened while still resembling a look-up table?
I think the way you have done it is fine. You could use a std::map, but that approach has no advantages compared to your approach. If you want to do it anyway, you can do it like this:
std::string to_s... | {
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python, python-3.x, game, tic-tac-toe
def isGameOver(board, playerOneSprite, playerTwoSprite): #checks if eiither player won
for i in range(3):
if board[i][0] == board[i][1] and board[i][1] == board[i][2]:
if board[i][0] == playerOneSprite:
print("Player one wins!")
... | {
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"tags": "python, python-3.x, game, tic-tac-toe",
"url": null
} |
beginner, haskell, caesar-cipher
Title: Caesar-Cipher Implementation Background
I am a total beginner in Haskell, so after reading the Starting out-chapter of "Learn you a Haskell", I wanted to create my first program that actually does something.
I decided to do the famous Caesar-Cipher.
Code
import Data.Char
encryp... | {
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1024 permutations 112 total with 5 in a row of 1 112 / 912 odds of 5 in a row 112 / 1024 probability of 1 in a row of 5 or 10.9375 % probability of getting 1 in a row of 5 912 total without 1 in a row of 5 912 / 112 odds of 1 never in a row of 5 912 / 1024 probability of 1 never in a row of 5 or 89.0625 % probability n... | {
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"lm_q2_score": 0.8152324938410783,
"openwebmath_perplexity": 235.68330870479673,
"openwebmath_score": 0.636867105960846,
"tag... |
power-spectral-density, frequency-response, random-process
Title: Frequency response terminology: $N(i\omega)$, $Q(i\omega)$ I am reading through an analysis of a system
$$
Y(t) = \frac{d}{dt}X(t) + X(t)
$$
and the frequency response $H(i\omega)$ is defined as
$$
H(i\omega) = \frac{N(i\omega)}{Q(i\omega)} = \frac{1+i\... | {
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"tags": "power-spectral-density, frequency-response, random-process",
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} |
newtonian-mechanics, newtonian-gravity, projectile, drag
When you are moving fast in the fluid you are accelerating the fluid a lot and the drag is dominated by inertial forces. This gives us the quadratic drag law:
$$ F = \tfrac{1}{2}\,\rho\,v^2\,C_d\,A \tag{2} $$
where $\rho$ is the fluid density. Note that this tim... | {
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"tags": "newtonian-mechanics, newtonian-gravity, projectile, drag",
"url": null
} |
matlab, fourier-transform, continuous-signals
Title: MATLAB Plot of FT(Cos) Displays Weird Impulse It is known that:
$$
\mathcal{F}\{\cos(2\pi t)\}=\frac{\delta(f-1)+\delta(f+1)}{2}
$$
However, on MATLAB, I used F=fftshift(fft(x))/N; to obtain the FT of $\cos(2\pi t)$ and I obtained the following:
My question is why... | {
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"tags": "matlab, fourier-transform, continuous-signals",
"url": null
} |
electromagnetism, electricity
Title: Zero or non zero electrical potential energy of the system Say you have this scenario:
and you wanted to find the electric potential energy of the +q charge
Now if you were to find the potential energy of +Q and +q system and add that to the potential energy of the -Q and +q syste... | {
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"tags": "electromagnetism, electricity",
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∨ (OR) by ∧ (AND). 3. • Construct truth tables for conditional statements. SOLUTION a. It is denoted as p ↔ q. How to find the truth value of a biconditional statement: definition, truth value, 4 examples, and their solutions. In Example 3, we will place the truth values of these two equivalent statements side by side ... | {
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"openwebmath_score": 0.5925559997558594,
... |
if $\tau\in(-\infty,0]$ then $g(\tau)=0$
if $\tau\in[1,3)\cup[3,\infty)=[1,\infty)$ then $g(\tau)=0$
so we can reduce the integral: $\int_{-\infty}^{+\infty} f(t - \tau) g(\tau) \ d\tau\to \int_{0}^{1} f(t - \tau) g(\tau) \ d\tau$
now in the interval $(0,1),\ g(\tau)$ is a constant, so we can take it out:$\int_{0}^{... | {
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"openwebmath_score": 0.7884857654571533,
"tag... |
Medical Field Majors, Habanero Bbq Sauce, Ceramic Cutter Blade, Crockpot Orange Chicken With Orange Juice Concentrate, Are Aerospace Engineers In Demand, Kesar Mango Pulp Recipes, How To Use Agate Stone, 8 Coins Puzzle, Spc Reese Bookstore, | {
"domain": "agrufruto.com",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9822877002595527,
"lm_q1q2_score": 0.8289477872616092,
"lm_q2_score": 0.8438951104066293,
"openwebmath_perplexity": 436.3805248520124,
"openwebmath_score": 0.8949205875396729,
"tag... |
if we assume that in the worst case, comparisons take time proportional to the number of bytes of data being compared, it would seem that radix sorting should win out. Mimimum number of comparison to sort 13 elements/numbers for any comparison based sorting algorithm? We recommend you to see Counting Sort for details o... | {
"domain": "a2zwebsolutions.com",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9372107896491796,
"lm_q1q2_score": 0.8039095196060109,
"lm_q2_score": 0.8577681013541611,
"openwebmath_perplexity": 1185.4432293064933,
"openwebmath_score": 0.27756467461586,
... |
file-formats, format-conversion, sequence-annotation, emboss
My EMBL file is only 1.19 GB compared to the GFF3 3.34 GB, so I probably lost a lot of annotation that is not supported by EMBL. That error is telling you that the script you were running was killed by signal 9, also known as SIGKILL, while executing the com... | {
"domain": "bioinformatics.stackexchange",
"id": 472,
"lm_label": null,
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"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "file-formats, format-conversion, sequence-annotation, emboss",
"url": null
... |
organic-chemistry, resonance
Title: How do I identify resonating structures for an Organic compound Basically, my concepts regarding Resonance are not totally clear. I just need some help, on how to find the no. of resonating structures, given a molecule, and how do I draw those structures. Some examples would be pret... | {
"domain": "chemistry.stackexchange",
"id": 7257,
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"tags": "organic-chemistry, resonance",
"url": null
} |
: Hyperbolic. Compute answers using Wolfram's breakthrough technology & knowledgebase, relied on by millions of students & professionals. What is the integral of the arctangent function of x? The most common convention is to name inverse trigonometric functions using an arc- prefix: arcsin(x), arccos(x), arctan(x), etc... | {
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"lm_q1_score": 0.975576914916509,
"lm_q1q2_score": 0.819225069619418,
"lm_q2_score": 0.839733963661418,
"openwebmath_perplexity": 1355.793883436179,
"openwebmath_score": 0.8261556029319763,
"tags": n... |
c#, linq, asp.net, entity-framework, chat
Players.Add(player);
}
return player;
}
public ServerPlayer GetPlayer(string playername)
{
return Players.Where(x => x.UserName == playername).FirstOrDefault();
} GetOrCreate methods are inherently dual-purpose which violates the Single Responsibility Principle. ... | {
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"tags": "c#, linq, asp.net, entity-framework, chat",
"url": null
} |
3. Fdfsn0 Rattling clean internet internet site , appreciate it for this post.
4. classwalk says:
71503 43820If I should say something, then nothing will stop the chatter within 167990
5. Great beat ! I wish to apprentice while you amend your site, how
could i subscribe for a blog site? The account aided me a accept... | {
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"lm_q1q2_score": 0.8044322124047666,
"lm_q2_score": 0.8104789063814617,
"openwebmath_perplexity": 1851.3099196501164,
"openwebmath_score": 0.3466041386127472,
... |
machine-learning, data-mining, random-forest, decision-trees, xgboost
Adaboost: this is the original algorithm; you tell subsequent models to punish more heavily observations mistaken by the previous models
Gradient boosting: you train each subsequent model using the residuals (the difference between the predicted and... | {
"domain": "datascience.stackexchange",
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"tags": "machine-learning, data-mining, random-forest, decision-trees, xgboost",
"url... |
BE MY CHEAPEST UNIT. MATLAB will report many critical points, but only a few of them are real. For problems 1 - 43 determine the critical points of each of the following functions. The second derivative test is employed to determine if a critical point is a relative maximum or a relative minimum. Now, this looks unplea... | {
"domain": "oldsaltys.com",
"id": null,
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9848109494088427,
"lm_q1q2_score": 0.8028498818276774,
"lm_q2_score": 0.815232489352,
"openwebmath_perplexity": 300.69050972341927,
"openwebmath_score": 0.7593972086906433,
"tags": nul... |
quantum-mechanics, angular-momentum, atomic-physics
Title: Total orbital and spin angular momentum for a closed shell I read one Phys.SE question similar to mine, in
Total angular momentum in a full shell
but the question was so confusing and vague. The answer, though, was helpful for me to understand a part of my que... | {
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"tags": "quantum-mechanics, angular-momentum, atomic-physics",
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### Question 3
Multiple choice!
The decimal $0.23$ equals:
(A) $\dfrac {23}{10}$
(B) $\dfrac {23}{100}$
(C) $\dfrac {23}{1000}$
(D) $\dfrac {23}{10000}$
### Question 4
The decimal $0.0409$ equals:
(A) $\dfrac {409}{100}$
(B) $\dfrac {409}{1000}$
(C) $\dfrac {409}{10000}$
(D) $\dfrac {409}{100000}$
## SIMPL... | {
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"openwebmath_score": 0.7920145392417908,
"... |
matlab, fft, noise, statistics, compression
RC=zeros(N,M);
for m=1:30 % m upto 30 to save comptuational time. Already noticed only PC(1:8) are important.
buf=PC(:,m)*RHO(:,m)'; % invert projection
buf=buf(end:-1:1,:);
for n=1:N % anti-diagonal averaging
RC(n,m)=mean(... | {
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"tags": "matlab, fft, noise, statistics, compression",
"url": null
} |
To summarize, an insertion sort of N items always requires exactly N - 1 passes through the sorted portion of the list. Unlike many sorting algorithms with quadratic complexity, it is actually applied in practice for sorting small arrays of data. -Kevin fr*****@msn. The example does this by defining a ReverseComparer c... | {
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"openwebmath_perplexity": 998.2573675633466,
"openwebmath_score": 0.3076539933681488,
"t... |
c++, performance, algorithm, pathfinding, c++20
template<typename Node = int>
std::string buildNonExistingArcErrorMessage(
Node const& tail,
Node const& head) {
std::stringstream ss;
ss << "The arc (" << tail << ", " << head << ") does not exist.";
return ss.str();
}
... | {
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"tags": "c++, performance, algorithm, pathfinding, c++20",
"url": null
} |
• Never mind (4). in the preview mode every sentence had "\" in front of it while in here as you see Everything is fine. I see the mistake $< and \leq$ thank you for pointing it out. Thank you. I started induction only 2 weeks ago and it is a difficult topic for me. – Scavenger23 Feb 18 '15 at 16:37
• You see I didn't ... | {
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"lm_q2_score": 0.8774767794716264,
"openwebmath_perplexity": 258.29928123296617,
"openwebmath_score": 0.8213667869567871,
"ta... |
audio, signal-detection
Title: Testing if a signal contains a specific previously recorded signal I am working on a project that converts radio data and transcribes it into text looking for specific types of radio chatter. For most of the time, the radio signal is dead air. Periodically, there will be a callout for a ... | {
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"tags": "audio, signal-detection",
"url": null
} |
ros2, c++, custom-message
In any event, it would be nice if this was made clearer and the response to a lower case beginning letter wasn't the message generator python program crashing and a simple error message indicating that was generated instead.
I sympathise with you in that it took time to figure this out, and ... | {
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Edit: Here's a gnuplotted image: (In each iteration, we make a tangent in the current point (the blue dashed line) and the $x$ for which the tangent crosses 0 is taken to be the next approximation (so we go along the magenta line in order to get the starting point for the next iteration).)
By the way, have a look at t... | {
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"openwebmath_score": 0.7813798189163208,
"tag... |
terminology, lambda-calculus, computation-models, types-and-programming-languages
or use of σ and ν as in
"From λσ to λν-a Journey through Calculi of Explicit Substitutions" by Pierre Lescanne.
and of course Barendregt's Lambda Cube
Note: For the Weak systems ω should be underlined.
λ→ The Simply Typed Lambda Cal... | {
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"openwebmath_score": null,
"tags": "terminology, lambda-calculus, computation-models, types-and-programming-languages",
"... |
c++, linked-list
ForwardListIterator& operator=(const ForwardListIterator&& rhs) noexcept
{
std::swap(_itr, rhs._itr);
return *this;
}
ForwardListIterator& operator++()
{
assert(_itr != nullptr && "Iterator out-of-bounds.");
_itr = static... | {
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"id": 27293,
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"openwebmath_score": null,
"tags": "c++, linked-list",
"url": null
} |
molecular-biology, histone
Methylation
Acetylation
Other modifications such as phosphorylation and ubiquitylation also exist but they are not generally considered in this "code".
Acetylation masks the histone's positive charge and thereby loosens the chromatin (DNA wrapped around the histones), which in turn facilita... | {
"domain": "biology.stackexchange",
"id": 3243,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "molecular-biology, histone",
"url": null
} |
(19.2)\begin{split} \begin{align*} S ~~&=~~0~~ \mbox{if}~N=0 \\ &=~~ X_1 + X_2 + \cdots + X_n ~~ \mbox{if}~N = n > 0 \end{align*} \end{split}
By conditioning on $$N$$, show that
$M_S(t) ~~=~~ M_N\big{(}\log M_X(t) \big{)}$
You can assume that all the quantities above are well defined.
(b) Let $$N$$ have the geometr... | {
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"openwebmath_score": 0.9698046445846558,
"tags": n... |
signal-analysis, eeg
In a nut shell:
- What is qEEG exactly and how to compute it technically to come up with something like in figure above?
I feel it should be related to short time-Fourier transform. qEEG or quantitative EEG is an umbrella term that encompasses many different signal processing methods that compute... | {
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"url": null
} |
performance, haskell, simulation, physics
Actually, I might have mis-interpreted the profile for point number two a bit - the following is actually a big no-no:
type CellIndex = [Int] -- The index of a cell [i, j, k]
Haskell can do a lot of optimization, but only if it has enough information. As it stands, getCell wi... | {
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"tags": "performance, haskell, simulation, physics",
"url": null
} |
acoustics
$v=f\lambda$
The frequency however is generally independent of the medium, although it can vary with the relative velocity of the sound source with respect to the observer, due to the Doppler Effect.
The 'pitch' heard relates to the perception of frequency of a sound vibration. It is dependent upon the physi... | {
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algorithms, graphs, shortest-path
Now, the more edges and vertices we add, the more complex the problem becomes, since we need to update other entries in the matrix if they are connected. The one fact that I know about this kind of graph is that it is symmetric along the diagonal.
I've been looking at this problem for... | {
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"tags": "algorithms, graphs, shortest-path",
"url": null
} |
ros, setup.bash
Originally posted by Steven Bellens with karma: 735 on 2011-11-08
This answer was ACCEPTED on the original site
Post score: 4
Original comments
Comment by Steven Bellens on 2011-11-09:
#!/bin/sh
source ~/ros/setup.bash
export ROS_ROOT=~/ros
export PATH=$ROS_ROOT/bin:$PATH
export PYTHONPATH=$ROS_ROOT/c... | {
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"tags": "ros, setup.bash",
"url": null
} |
c#
Title: Passing parameter to singleton I wrote this factory class in order to pass parameter to Singlton class, is it a good design in term of design for multithreading environment?
public static class LoggingServiceFactory
{
private static string _connectionstring;
private static readonly Lazy<LoggingServic... | {
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"tags": "c#",
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c, game, tic-tac-toe
}
return 0;
} General:
I myself am writing a Tic-Tac-Toe game of sorts, so I am go to try to not give my code away too much. For a self-taught beginning C programmer, this code looks good. However, it looks like you were over thinking things a bit based on how long your code is.
What you did... | {
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"tags": "c, game, tic-tac-toe",
"url": null
} |
python, pygame
Title: First Chess Project (ver 1.1) I'd already asked for my code to be reviewed earlier here
First Chess project)
Full code
Considering the suggestions put forth for that question, I spent a day and refactored my whole code. For those who have seen my previous question/code, could you you point out an... | {
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"tags": "python, pygame",
"url": null
} |
javascript, game-of-life
survThresh.splice(index, 1);
} else if (box.checked && index === -1) {
survThresh.push(+(box.value));
}
};
})(chkSurvival[i]);
}
thresholdPicker.onchange = function(){
if(thresholdPicker.value === "Custom"){
document.querySelector(".thresholds").... | {
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"openwebmath_score": null,
"tags": "javascript, game-of-life",
"url": null
} |
java, unit-testing, linked-list, interview-questions
// The list contains one element. We don't run the while loop in reversePairs
@Test
public void testSingleElement() {
int[] orig = new int[] { 12 };
int[] expected = new int[] { 12 };
SinglyLinkedList linkedList = new SinglyLinkedLis... | {
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"tags": "java, unit-testing, linked-list, interview-questions",
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} |
acceleration, velocity, distance
Title: Calculate distance an accelerometer moved I am reading accelerometer data and want to determine the distance that the accelerometer is moved. ( My question is similar to the one placed here, Calculate speed from accelerometer . I just feel as if it lacks in formulating a complet... | {
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"tags": "acceleration, velocity, distance",
"url": null
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Are there alternative ways to make this precise?
• A trivial answer to 1. and 2. would be to define a topology on $P(\Bbb R),$ the power-set of $\Bbb R$, as $\{\emptyset, P(\Bbb R)\setminus \tau, P(\Bbb R)\}$ and a measure $m$ with $m(P(\Bbb R))=1$ and $m(\tau)=0.$ But I don't think this is quite what you're hoping fo... | {
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"lm_q2_score": 0.8670357666736772,
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"openwebmath_score": 0.9278112053871155,
"ta... |
ros, navigation, ros-melodic, move-base, avoid-obstacle
Originally posted by Arthur6057 on ROS Answers with karma: 13 on 2020-08-11
Post score: 1
Thank you for providing all the required information but I'm not entirely sure to get what is not working for you exactly. I'm still answering to provide you some insights.... | {
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"tags": "ros, navigation, ros-melodic, move-base, avoid-obstacle",
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c#, performance, linq
if (a.Equals(Type))
{
try
{
Queues[i].Send(QueueMessage)
}
catch (MessageQueueException mqe)
{
//log Error about mqe
}
}
}
}
... | {
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"openwebmath_score": null,
"tags": "c#, performance, linq",
"url": null
} |
statistical-mechanics, condensed-matter, experimental-physics, bose-einstein-condensate
Title: Experimental evolution of condensates I was talking to a colleague professor the other day and he said something that got me curious. The way I remember it, he said basically that in experiments a Bose-Einstein condensation ... | {
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"tags": "statistical-mechanics, condensed-matter, experimental-physics, bose-einstein-conde... |
python, performance, numpy, pandas
I built a quick codesandbox here if you wish to test it out.
Is this the right implementation for the problem I am trying to solve? Would appreciate some guidance on this code implementation. Don't import *.
Move your data to a CSV.
Your constraint construction seems a little too gen... | {
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"openwebmath_score": null,
"tags": "python, performance, numpy, pandas",
"url": null
} |
assembly, covid-19, genome-sequencing, software-usage, virus
What other option could explain these circumstances that I could be missing?
As I've suggested, I think that that leaves the reads. How sure are you that they are comparable to your other runs? They look like they should be sufficient from my glance at SRA,... | {
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"tags": "assembly, covid-19, genome-sequencing, software-usage, virus",
"url": null... |
thermodynamics, entropy, reversibility, heat-engine
Problem: Entropy is a state function so $\int_{A \operatorname{irrev}}^{B} \frac{\mathrm{d} Q}{T}= {\Delta} S. $ By the inequality derived we have ${\Delta} S>{\Delta} S$ which is absurd. Considering the result $$\int_{A \operatorname{irrev}}^{B} \frac{\mathrm{d} Q}{... | {
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"openwebmath_score": null,
"tags": "thermodynamics, entropy, reversibility, heat-engine",
"url": null
} |
It is currently 21 Feb 2019, 19:44
### GMAT Club Daily Prep
#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.
Customized
for You
we will pick new questions that match your level based o... | {
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"lm_q1_score": 0.9783846672373523,
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"lm_q2_score": 0.824461928533133,
"openwebmath_perplexity": 929.7657981521663,
"openwebmath_score": 0.5725544691085815,
"tags... |
ros, ros-pcl, ros-fuerte, nodelets
Originally posted by joq with karma: 25443 on 2012-04-18
This answer was ACCEPTED on the original site
Post score: 3
Original comments
Comment by CaptainTrunky on 2012-04-18:
Hm. But I have it in perception_pcl/pcl_ros/lib. In CMakeLists.txt section for this nodelets was commented o... | {
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"tags": "ros, ros-pcl, ros-fuerte, nodelets",
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} |
javascript, parsing, coordinate-system, svg, cross-browser
<path id="star"
fill="#eee"
d="M301.113,12.011l99.25,179.996l201.864,38.778L461.706,380.808 l25.508,203.958l-186.101-87.287L115.01,584.766l25.507-203.958L0,230.785l201.86-38.778L301.113,12.011z"
></path>
</svg>
</... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "javascript, parsing, coordinate-system, svg, cross-browser",
"url": null
} |
backpropagation, gradient
This is useful for neural networks, because each layer (and each activation function) is applied as a function to each previous layer, so a neural network is effectively a giant composite of much simpler functions, each applied to the output of the previous one.
The goal of back-propagation i... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "backpropagation, gradient",
"url": null
} |
tensor-calculus
$v^{i}\rightarrow v^{i'}=A_{i}^{i'}.v^{i}$ when $e_{i}\rightarrow e_{i'}=A_{i'}^{i}.e_{i}$ as the definition of a contravariant vector.
Here, $e_i$ is the ith vector in a basis $E$. Lets see if we can derive this.
First, we can write the second equation as a matrix equation:
$E'=A.E$
its worth not... | {
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"openwebmath_score": null,
"tags": "tensor-calculus",
"url": null
} |
optics, everyday-life
Title: Weird phenomenon when passing light through a net Came across this weird "phenomenon" yesterday and looked everywhere for the reason.
when placed at a certain point the light illuminates only the vertical strings of the net.
creepy ...
given the light source must be in the same orientatio... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "optics, everyday-life",
"url": null
} |
newtonian-mechanics, forces, time, distance
Title: Forces distance dependent find derivatives of position time dependent Suppose we have a force which is dependent on distance from some point. It is easy to find the acceleration based on the distance from that point, but in a previous question, I asked they told me th... | {
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"tags": "newtonian-mechanics, forces, time, distance",
"url": null
} |
• In other words, if you have $x$ going from $0$ to $1$ and then for any fixed value of $x$ you have $y$ going from $0$ to $3(1-x),$ and that's the same as saying $y$ is between $0$ and $3,$ and for each fixed value of $y$ between $0$ and $3$ you have $x$ going from $0$ to $(3-y)/3. \qquad$ – Michael Hardy Dec 25 '18 a... | {
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"lm_q2_score": 0.8740772351648677,
"openwebmath_perplexity": 303.12921074514526,
"openwebmath_score": 0.9974572658538818,
"ta... |
homework-and-exercises, fluid-dynamics, pressure, power, bernoulli-equation
That is, even if $2$ is before the pump, the velocity there is different from the situation with no pump. And that's what I cannot understand here. How is that possible? And can I use $(1)$ between $1$ and $2$?
Any suggestion is highly appreci... | {
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"tags": "homework-and-exercises, fluid-dynamics, pressure, power, bernoulli-equation",
"u... |
And then we have the correction times the matrix of first derivatives, and what's the name for that matrix of first derivatives? Well, if I'm just given n functions-- yeah, what am I after here? I'm looking for the Jacobian. So here we'll go the Jacobian, J. This is the Jacobian named after Jacoby, Jacobian matrix.
An... | {
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"lm_q2_score": 0.868826784729373,
"openwebmath_perplexity": 490.2249764044709,
"openwebmath_score": 0.8232865929603577,
"tags": null,
... |
If stock price is $$X = (0,30)$$; we use the 7 puts (A) for profit = 7(40 - X); 9 (B) puts are used giving a loss = 9(30 - X). Total earning = 7(40-X) -9(30-X) + 2$= 2X + 12$ > 0
- 3 years, 2 months ago
Assume that the $40 put is still priced at$10.
What would be the price of the $30 put option, where there will be ... | {
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"lm_q1q2_score": 0.8284415819511814,
"lm_q2_score": 0.8723473746782093,
"openwebmath_perplexity": 3168.6229834519763,
"openwebmath_score": 0.9664960503578186,
"ta... |
classification, dataset, class-imbalance
Title: How much is the Class Imbalance Problem rates? I'm working on a data set and wanted to know is there a standard rate about Class Imbalance problem or not?
I have 47 samples in Class A and 150 Sample in class B , should I use Class Imbalance Technique or these rates are n... | {
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"openwebmath_score": null,
"tags": "classification, dataset, class-imbalance",
"url": null
} |
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