text stringlengths 1 1.11k | source dict |
|---|---|
material-science
I've not specified tensile, ductile, or a specific kind of strength to increase the quantity (and probability) of answers. The commenters are right that this is going to depend a lot on the specifics of your powder (particle size distribution, composition, etc.) and on your laser processing technique.... | {
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time-limit-exceeded, perl, bioinformatics
I put a small part of the input file and the hg38.
I have a program that seems to work and produce the same results as your own code. However I have a problem in that the intron doesn't seem to be defined properly
Suppose my sequence is the alphabet and the exons we have are ... | {
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"tags": "time-limit-exceeded, perl, bioinformatics",
"url": null
} |
java, multithreading, android, thread-safety
Title: Simple Background Thread Worker Class (follow-up) This is a follow up of Simple, generic background thread worker class
What changed?
Moved from synchronized lazily evaluated static instances to true Singletons per the on-demand holder idiom https://en.wikipedia.org... | {
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"tags": "java, multithreading, android, thread-safety",
"url": null
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Sort a and b ,then apply hash function.
c=hash(sort(a,b))
Here,
1. c is unique for the inputs and not reversible.
2. a and b are interchangeable (a & b = b & a).
• All hash functions have collisions, multiple inputs with the same output. So this violates requirement 1. The probability of getting a collision for two ... | {
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"tag... |
python, python-3.x, unit-testing, pandas
class TestOperations(unittest.TestCase):
def test_minimal(self):
"""To make sure at least a test is passed"""
self.assertEqual('foo'.upper(), 'FOO')
def test_disaggregate_ops_volume_date(self):
input = pd.DataFrame(
{'SEQ_PERIODSTAR... | {
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"tags": "python, python-3.x, unit-testing, pandas",
"url": null
} |
thermodynamics
Secondly, I should warn that the proofs I supply are in no way rigorous but should suffice for a standard thermodynamics course.
Thirdly, I have used a small $q$ for heat, reserving capital $Q$ for a partition function.
Classical thermodynamics
The classical definition of entropy in thermodynamics is du... | {
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"tags": "thermodynamics",
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} |
probability, randomness, quantum-measurements
But I think, that emitting these identical particles is extremely hard to achieve from an experimental point of view (mainly due to the Heisenberg uncertanty principle, decoherence and noise related to the experiment itself). So, if we are in fact unable to reproduce the s... | {
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"tags": "probability, randomness, quantum-measurements",
"url": null
} |
javascript, strings, matrix
Title: Matrix transposition of a string Per a Reddit Daily Programming Challenge, I am performing a matrix transposition on a string using JavaScript.
Example input: 'The quick brown fox jumped over the lazy dog'
Output:
Tqbfjotld
hurouvhao
eioxmeezg
cw pr y
kn e
d
While my code wor... | {
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"tags": "javascript, strings, matrix",
"url": null
} |
ros, python, openni, depth
Title: Getting depth information from point using Python
Hi guys,
I'm trying to get depth information from a specific point. I'm using openni_launch topics "camera/rgb/image_color" (to calculate the point) and "camera/depth/image" (to get depth information). I use Python as a programming la... | {
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"tags": "ros, python, openni, depth",
"url": null
} |
inorganic-chemistry, hydrogen, vsepr-theory, alkaline-earth-metals
All higher‐level calculations show SrH2 and BaH2 to be bent with angles of ∼140° and 120°, respectively, while CaH2 is linear with a flat potential‐energy surface for the bending motion.
The use of a core‐polarization potential together with the 2‐vale... | {
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"tags": "inorganic-chemistry, hydrogen, vsepr-theory, alkaline-earth-metals",
"url": nu... |
physical-chemistry, water, home-experiment, purification
Also how could I calculate the pressure in the pipe based on the fact that it tapers off and starts at the maximum size possible with the bowl still collecting rain and being heated by the sun? There is no way to answer your question accurately for this setup. I... | {
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"tags": "physical-chemistry, water, home-experiment, purification",
"url": null
} |
physical-chemistry, computational-chemistry, electronic-configuration, quantum-chemistry
Title: Is there an energy cost associated with flipping the spin of an electron? THE STORY: | {
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sun, fusion
Title: Where do the Neutrons for fusing Hydrogen to Helium in the Sun come from? The sun works by fusing hydrogen to helium (at the moment). While hydrogen is a single proton (I'm ignoring electrons here... not sure if they are relevant since it's probably a plasma anyway) helium consists of two protons an... | {
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"tags": "sun, fusion",
"url": null
} |
• if it is bounded, then it has a convergent subsequence $$(x_{n_k})_{k\in\mathbb N}$$. But if $$\lim_{k\to\infty}x_{n_k}=x$$, then $$\lim_{k\to\infty}f(x_{n_k})=f(x)$$, which is impossible, since $$\bigl(f(x_{n_k})\bigr)_{k\in\mathbb N}$$ is unbounded.
• if it is unbounded, then it has a subsequence $$(x_{n_k})_{k\in\... | {
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"lm_q1_score": 0.9783846621952493,
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"lm_q2_score": 0.8519528038477824,
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"openwebmath_score": 0.9834232330322266,
"ta... |
beginner, c, calculator
scanf("%s", inp);
val = strtol(inp, NULL, 0);
As above, use scanf("%lf", ...) instead (shorter, and you can check for errors)
int sum(int need)
Once what i said above is fixed (price and capacity as double) your function work fine. However, you can simplify it, by doing the computation in on... | {
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"tags": "beginner, c, calculator",
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} |
genetics, gene-expression, dna-methylation, cpg
Title: How do DNA methylation canyons/DNA methylation valleys/DMCs differ from CpG islands? Are these just both regions of the genome that are undermethylated? Is the only difference that for something to be a CpG islands it needs a high level of CpG sites and DMCs don't... | {
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"tags": "genetics, gene-expression, dna-methylation, cpg",
"url": null
} |
frequency-spectrum, dft, frequency-domain, snr, signal-power
For this signal SNR ~$18$ dB. Here (page 95, formula (3-33)) I found definition for calculating one SNR over another as the following:
$$SNR_M = SNR_N+20\cdot log_{10}\left(\sqrt{\frac{M}{N}}\right),$$
which I don't completely understand. My first question i... | {
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"tags": "frequency-spectrum, dft, frequency-domain, snr, signal-power",
"url": null
} |
reference-frames, time-evolution, unitarity, two-level-system, rabi-model
\frac{d}{dt}|\psi\rangle_B &= -\frac{i}{\hbar} (H_{1,B}-T_B) |\psi \rangle_B\\
\frac{d}{dt} O_B &= -\frac{i}{\hbar}[O_B,H_{2,B}+T_B] + \left(\left(\frac{d}{dt}O_S \right)_A\right)_B
\end{align}
In other words, you transform all of the operators ... | {
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"url... |
Update: do we have some sort of concentration inequality for $X^T X$?
Let $$Y := Z^T \Sigma Z$$. We have $$\operatorname{var}(Y) = \mathbb{E}(Y^2) - \mathbb{E}(Y)^2$$ and $$\mathbb{E}(Y) = \sum_i \sigma_{i, i}$$. We thus need to compute $$\mathbb{E}(Y^2)$$. For this, write $$\mathbb{E}(Y^2) = \mathbb{E}\left( \sum_{i,... | {
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"openwebmath_score": 0.9975719451904297,
"tags"... |
beginner, ruby, rock-paper-scissors
Title: Let's play Rock, Paper, Scissors with Ruby I'm just looking for any tips to improve the code, particularly easier ways to change the main logic of the code so that it's shorter.
puts "Let's play rock, paper, scissors"
#scores
compScore = 0
humanScore = 0
until compScore == ... | {
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"tags": "beginner, ruby, rock-paper-scissors",
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case 9: both x and y are 0: |x|= 0 and |y|= 0. xy= 0 so |xy|= 0= (0)(0)= |x||y|.
There are simpler ways to prove that but I thought this would be conceptually clearest.
3. Jul 25, 2008
sagardipak
First, we have to understand that the absolute value is a function defined by:
$$|x| = \begin{cases} x & \text{if } x\g... | {
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"ta... |
newtonian-mechanics, energy, harmonic-oscillator, spring
Title: Does changing the mass affect velocity if the amplitude stays the same? There's a block of mass $M$ connected to a spring of negligible mass. This is set up horizontally, and there is no friction between the block and the surface. The block oscillates wit... | {
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temperature, sun, light, equator, insolation
And that is the answer to the question, and the related questions mentioned in my introduction.
Some specific calculations
The specific ratio of illumination difference for the two areas in the above image would be (approximately) simply the division of the two numbers.
The... | {
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"tags": "temperature, sun, light, equator, insolation",
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} |
newtonian-mechanics, energy, lagrangian-formalism, metric-tensor, work
# initial conditions
initial_X1, initial_Y1 = -5.0, -0.5
initial_X2, initial_Y2 = 5.0, 0.5
initial_velX1, initial_velY1 = 1.0, 0.0
initial_velX2, initial_velY2 = -1.0, 0.0
# ODE
# vect[0] = X1, vect[1] = Y1, vect[2] = X2, vect[3] = Y2
# vect[4] = ... | {
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"url": ... |
c, strings, pointers
#include <limits.h>
#include <stdio.h>
// Not re-entrant:
int main(void)
{
{
static const char input[] = " foo bar ";
const str_cslice_t trim_both = string_trim( input, sizeof(input) );
assert( trim_both.n <= INT_MAX );
printf( "\"%.*s\"\n", (int)trim_both.n, trim_both.s );
... | {
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"tags": "c, strings, pointers",
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} |
pl.programming-languages
TLDR : yes, F<:+bot is undecidable, as shown a proof of translation from it to F<: in the following link by myself: https://gitlab.com/JasonHuZS/AlgDotCalculus/blob/master/agda/FsubBot.agda
bot⇒full : ∀ {Γ S U} → List.map _* Γ ⊢ S * <: U * → Γ ⊢F S <: U
full⇒bot : ∀ {Γ S U} → Γ ⊢F S <: U → Lis... | {
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the time-fractional coupled approximate long-wave (LW) equations that describe the proliferation of shallow water waves, while if the parameters and in system , then we obtain the time-fractional coupled modified Boussinesq (MB) equations that describe the fluids flow in a. Extra close brace or missing open brace Extra... | {
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"openwebmath_score": 0.5333122611045837,
"tags... |
quantum-mechanics
For instance in a hydrogen atom in the ground state the fluid pushing on the tracers is like a force that totally opposes the classical force and the tracer can sit there at rest, specifically the location of the electron and proton has a relative separation and that doesn't change in time. Quantum m... | {
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"tags": "quantum-mechanics",
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} |
acid-base, ionic-compounds, erratum
Are all ionic compounds salts? Are all salts ionic compounds? Interestingly, IUPAC states that a "salt" is "a chemical compound consisting of an assembly of cations and anions". Under this definition, all ionic compounds are salts, and all salts are ionic compounds.
Therefore, some... | {
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"tags": "acid-base, ionic-compounds, erratum",
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c#, console
switch (yourBallColor)
{
case ConsoleKey.W:
yourBalls.Add(new(BallColor.White));
break;
case ConsoleKey.R:
yourBalls.Add(new(BallColor.Red));
break;
... | {
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"openwebmath_score": null,
"tags": "c#, console",
"url": null
} |
c++, validation, template, interval, overloading
inline PixelComponent operator+(const T& elem){
PixelComponent result;
result = value + elem;
return result;
}
inline PixelComponent operator-(const T& elem){
PixelComponent result;
result = value - elem;
return r... | {
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"tags": "c++, validation, template, interval, overloading",
"url": null
} |
lagrangian-formalism
Not always. But in this case, yes.
all I got were few known results & other nonsensical ones (like the one in this question. Probably due to my erroneous application of the Lagrange.)
You didn't get the results you got because of your own fault but because of virtue of Lagrangian formulation of ... | {
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ros-kinetic
def callback(self,ros_pics):
try:
my_image = self.bridge.imgmsg_to_cv2(ros_pics, encoding = "passthrough")
except CvBridgeError as e:
print("CvBridge could not convert images from realsense to opencv")
height,width, channels = my_image.shape
my_heig... | {
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homework-and-exercises, statistical-mechanics, ising-model
Ive gotten to the point where I wrote it as
$H = N(J_1 + J_2)\langle S \rangle ^2 - \langle S \rangle \sum_{i=1}^{N}(J_1 + J_2)S_i + J_1 S_{i+1} + J_2 S_{i+2}$
but I dont know if Im on the right track or how I should continue. Any help with this exercise woul... | {
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"tags": "homework-and-exercises, statistical-mechanics, ising-model",
"url": null
} |
homework-and-exercises, electromagnetism
The standard solution suggests to divide the conductor into infinitesimal current filaments and then to integrate. They find that a infinitesimal current filament with current $\mathrm dI$ has the magnitude:
$$\mathrm dB = \frac{\mu_0 \mathrm dI}{2 \pi r} \cos(\alpha),$$
wh... | {
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"tags": "homework-and-exercises, electromagnetism",
"url": null
} |
homework-and-exercises, newtonian-mechanics, reference-frames, free-body-diagram
Title: Why satellite that orbit earth has $F_{\rm net}$ = non-zero, if he don't accelerate? From inertial frame car in turn has centripetal force $Fs=mv^2/r$ and satellite orbit earth has $mg=mv^s/r$.
Non inertial frame
In both case grav... | {
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"openwebmath_score": null,
"tags": "homework-and-exercises, newtonian-mechanics, reference-frames, free-body-diagram",... |
newtonian-mechanics, special-relativity
$$
As you can see, $\vec{f}$ and $\vec{a}$ will in general not be parallel. If we take the inner product of $\vec{f}$ and $\vec{v}$ and divide by $c^2$, we get
$$
\begin{align}
\frac{m_0^{-1}}{c^2}\gamma \left(\vec{f}\cdot\vec{v}\right) =
\frac{m_0^{-1}}{c^2}\gamma fv\cos\theta ... | {
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"tags": "newtonian-mechanics, special-relativity",
"url": null
} |
algorithms, algorithm-analysis
Title: How can I prove algorithm correctness? How can I prove algorithm correctness ?
when i face a problem and come up with a solution the only way to know if this a valid solution or not is by trying some test cases. if they pass through the algorithm and produce the expected output th... | {
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"tags": "algorithms, algorithm-analysis",
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} |
.net, vb.net, reflection
I'm not too fond of the VB.NET syntax, so for my own sake I'll "translate" it:
private TC GetControl<TC>() where TC : Control
{
return (TC)Control;
}
Okay. I hope I got this right, the VB syntax for generics is quite foreign to my see-sharp eyes.. Point is, I don't think that method is re... | {
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"tags": ".net, vb.net, reflection",
"url": null
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javascript
If older browsers aren't a concern, you can just use fetch instead of XHR. It's built-in and uses promises.
HTTP 200 isn't the only "successful" response status. See https://en.wikipedia.org/wiki/List_of_HTTP_status_codes.
Status "0" is a generic network error, not just being offline. It can also be caused ... | {
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c++, beginner, rock-paper-scissors
Result evaluateRound(int computer, int human) {
if (computer == human) {
return Result::draw;
} else if (human == computer + 1 || human == 1 && computer == 3) {
return Result::win;
}
return Result::lose;
}
Now we can use this like this:
int player... | {
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figure(figsize=(16,6))
subplot(1,2,1)
bdayplot(70,5,'+','upper left')
subplot(1,2,2)
bdayplot(365)
plot([70,70],[0,1],c='gray',linestyle='--');
Note that $\frac{n(n-1)}{2}\frac{1}{365}$ is a good approximation to the first function (red) for small $n$, up to about $n=14$ (it just counts the number of pairs times the ... | {
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"tags": nul... |
javascript, functional-programming, hash-map, underscore.js, lodash.js
It's pretty much the functional-style equivalent of Bergi's answer.
Point is, reduce is probably what you want for this.
Edit: As Bergi points out in the comments the inner iteration could also be a reduce operation
function arrayAwareInvert(obj) ... | {
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ros, gps
It works, thank you boss
Comment by ljaniec on 2022-08-14:
If it worked, please accept it as an answer :)
Comment by noname on 2022-08-14:
I thought I already did?
Comment by ljaniec on 2022-08-15:
You have a second button under the <1> with text "mark this answer as correct` - I thought about this one | {
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java
You set them in the instance constructor! So, they're really instance variables! If I were attempting to use your class, I might end up mighty confused as to behavior, when attempting to use two different instances. Also, your parameter names are terrible - they don't tell me at all what they're used for. And... | {
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php, html, security, e-commerce
Title: Securing PHP shopping cart (Paytrail integration) - follow-up I've developed my shopping cart further. This is related to my earlier post: Securing PHP shopping cart
In addition to those functionalities, I've proceeded to make integration to Paytrail payment gateway. This post wi... | {
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javascript, userscript, firefox
user_pref("browser.search.geoip.url", "");
user_pref("browser.newtabpage.enhanced", false);
user_pref("browser.newtab.preload", false);
user_pref("browser.newtabpage.directory.ping", "");
user_pref("browser... | {
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"tags": "javascript, userscript, firefox",
"url": null
} |
sets, streaming-algorithm, equality, bloom-filters
The calculations get messier when $k>1$. If you're satisfied with an approximate upper bound, you can use the fact that when $k \ll \sqrt{m}$, $a$ will typically hash to $k$ different bits ($k$ different positions in the array). The probability that at least one of ... | {
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Thus, if the coefficient ring is a field (or domain), one of the RHS factors must be $0$. Since $\rm\:a\ne 0\:$ one of the other factors $= 0,\:$ i.e. the roots are not distinct.
Remark That the second determinant equals the first follows from the fact that the first columns are congruent modulo the others. More prec... | {
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"tag... |
algorithm, recursion, functional-programming, kotlin
I have a couple specific questions -
I am using the sliding window approach, is that appropriate in a functional setting? If not, what is a better approach functionally, speaking.
Is there redundancy in my recursion function that I can get rid of?
What things can ... | {
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"tags": "algorithm, recursion, functional-programming, kotlin",
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} |
reinforcement-learning, q-learning, state-spaces
This does not work because you are wasting some space, some values are not used in your representation.
For example with your 0-4 variables, you need 3 bits, but you only use 000, 001, 010, 011 and 100 values. The values 101, 110 and 111 are still part of the representa... | {
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"tags": "reinforcement-learning, q-learning, state-spaces",
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} |
$\theta$ is an unknown parameter and the difference between classical statistics and Bayesian is that $\theta$ is constant in classical statistics, but a random variable in Bayesian.
\begin{align}
{p_{\Theta \left| X \right.}}\left( {\theta \left| x \right.} \right) = \frac{{{p_\Theta }\left( \theta \right){f_{\Theta ... | {
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"tags": nul... |
c++, algorithm, tree, coordinate-system
// Copies elements from the nodes
points.reserve(NW.size() + NE.size() + SW.size() + SE.size());
points.insert(points.end(), NW.begin(), NW.end());
points.insert(points.end(), NE.begin(), NE.end());
points.insert(points.end(), SW.b... | {
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"tags": "c++, algorithm, tree, coordinate-system",
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} |
assembly, x86, nasm
;found free block
mov rdx, rax ;save the pointer to memory block
add rdx, block_meta.free ;set the block to be not free
mov byte[rdx], 0
jmp ._mallocExit
._needMoreSpace:
call ._requestSpace ;we did not find a big enoug block. so make sapce
jmp... | {
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} |
java, beginner, search, binary-search
} else {
start = mid + 1;
}
}
return -1;
}
} For beginner code, this is quite good. I am impressed. Good enough for me to assume you have worked from some example code. That is not a criticism, everyone does that (me too).
Still, many examples are ba... | {
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go
With some improvements:
package main
import (
"encoding/json"
"fmt"
"regexp"
"strings"
)
var fieldNameRegex = regexp.MustCompile(`^\w+$`)
func structToMap(client interface{}, fieldNames []string) (map[string]interface{}, error) {
names := make(map[string]bool, len(fieldNames))
for _, name... | {
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"tags": "go",
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} |
particle-physics, heisenberg-uncertainty-principle
Using the energy-time uncertainty relation, I do the following calculations:
$$\Delta E \Delta t \approx \hbar $$
$$\Delta t \approx \frac{\hbar}{\Delta E}$$
Taking $\Delta E $ to be the rest energy of the pion calculated above, the resulting $\Delta t$ comes out to b... | {
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conventions, units, dimensional-analysis
That said, for logarithms you can on certain very specific occasions talk about the logarithm of a dimensional quantity $q$, but there you're essentially taking some representative $q_0$ and calculating
$$\log(q/q_0)=\log(q)-\log(q_0),$$
where in making sense of the latter you... | {
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measurements, density, buoyancy, weight
So let's take your initial experiment. You don't tell us the volume of your object, but you do give its weight, $W_g = 100$ g, and density, $\rho_g = 2.6$ g/cm$^3$, so the volume is:
$$ V = \frac{W_g}{\rho_g} = 38.46 cm^3 $$
When you put this in water the volume of water displac... | {
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x SE)) to (mean – (1.96 x SE)) {\displaystyle \operatorname {E} (N)=\operatorname {Var} (N)} Analyze, graph and present your scientific work easily with GraphPad Prism. You might find more information there. ¯ N = size of the sample data set Meaning of standard error. If we plot the actual data points along with … Whic... | {
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"openwebmath_score": 0.8511279225349426,
"tags"... |
# Discrete Math - Hasse Diagrams
This is one of many questions of similar type I have to do for an assignment and im troubled with what to do. The question is as follows:
Consider a relation R defined on the set A = {−7, −6, −5, −4, −3, −2, −1, 0, 1, 2, 3, 4, 5, 6, 7}. Determine for the following if the relations are... | {
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"openwebmath_score": 0.8310334086418152,
"tag... |
virus, infection, human-eye
Title: How the conjunctivitis virus spread just by seeing a person's eye who is infected
Conjunctivitis or 'pink eye'.
I have a few questions on conjunctivitis. When I was suffering from conjunctivitis, my doctor advised me to wear sunglasses so that no one else gets infected.
I wonder ho... | {
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"tags": "virus, infection, human-eye",
"url": null
} |
algorithms, algorithm-analysis, python
Title: Finding the area of a rectangle in python Q: Standard input consists of exactly four integers, first x1 and y1, the coordinates of the bottom-left corner of a rectangle, then x2 and y2, the coordinates of the top-right corner.
Write a Python script named area-of-rectangle.... | {
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mathematics, simulation, statistics, rust
winnings
}
}
/// Goes through all tickets in this drawing assessing total winnings
fn compare_tickets(tickets: &[Ticket], winner: &Ticket) -> (i64, bool) {
let mut winnings = 0;
// Generate power play multiplier.
// Normally this is done during the drawing bu... | {
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"tags": "mathematics, simulation, statistics, rust",
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} |
c#, object-oriented
Single Responsibility Principle (The "S" in SOLID)
The AnimalPark class now break this principle because it manipulates list of animals and also allows to build it in the first place. We already have interface we can use (and that's something I would also argue against in iSR5's solution, why reinv... | {
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newtonian-mechanics, energy-conservation, work
(1.7) gives the definition of potential energy.
As we know, that definition is subject to a condition. Potential energy is well defined only if the value of that integral is independent of how the object moves from the start point to the end point. As we know: a force wit... | {
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} |
electrostatics, differentiation, vector-fields
$$\int_{\mathbb{R}^3} E_k(\vec{x})^2 d^3x <+\infty\quad k=1,2,3\:.$$
A known result of harmonic function theory states that a (real valued) harmonic function $f$ defined on the whole $\mathbb{R}^n$ such that the integral of $f^2$ is finite must be necessarily the zero fu... | {
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java, calculator, javafx, role-playing-game
You should instead instantiate the controller instance explicitly in the class Main:
@Override
public void start(Stage primaryStage) throws Exception{
FXMLLoader fxmlLoader = new FXMLLoader();
sample.Controller myController = new sample.Controller(/*pass dependencies... | {
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"tags": "java, calculator, javafx, role-playing-game",
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c++, strings, c++11, unicode
In your implementation file, you have two functions, _ReplaceRightToLeft() and _ReplaceLeftToRight() that are using a technically ilegal naming. Names starting with an underscore, followed by an uppercase letter are reserved by the C++ standard.
You are dealing with raw pointers here and t... | {
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consequences on some of the standard integrals that can be done using integration by parts. It is easy to make errors, especially sign errors involving the subtraction in the formula. The integration is of the form $I = \int {x\cos 2xdx}$ H. Using the Integration by Parts formula. Answer to: Use integration by parts to... | {
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"openwebmath_score": 0.9372503161430359,
"... |
optics, visible-light, spectroscopy
This includes knowledge of whether or not the minerals and elements in question possess any particular fluorescent properties.
(Luckily, planet surfaces aren't made of wood, which makes the identification processes a lot easier.)
This is true also for frozen ices like those of water... | {
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"tags": "optics, visible-light, spectroscopy",
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8Ahバッテリー【防犯登録無料】. • Portfolio optimization using python (cvxopt and scipy) using Mean-Variance, Maximized Return, Maximize Sharpe Ratio and Risk Parity. CAPM Analysis: Calculating stock Beta as a Regression with Python CAPM) is an extension of the Markowitz's Modern Portfolio Theory. Portfolio management can be viewed ... | {
"domain": "freccezena.it",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9632305381464927,
"lm_q1q2_score": 0.8047632511380802,
"lm_q2_score": 0.8354835309589074,
"openwebmath_perplexity": 1894.8592761976015,
"openwebmath_score": 0.26045969128608704,
"t... |
inertial-frames, space
As for QM, don't worry about it. The short answer is "yes, it still works," because we still fly spacraft, despite believing in quantum mechanics. However, if you really want an answer to that question, it's going to have to go into a lot more mathematical rigor, and lots of calculus. And in ... | {
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"openwebmath_score": null,
"tags": "inertial-frames, space",
"url": null
} |
python, c++, c++11
return textwrap.dedent(ostream_code.substitute(unit_name=self._unit_type))
def _literal_operators(self):
'''
Yields strings containing the implementation of the
user-literal operators for each unit. The suffix used
is an underscore followed by the unit name.
... | {
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"openwebmath_score": null,
"tags": "python, c++, c++11",
"url": null
} |
particle-physics, dark-matter, antimatter
As tfb says in a comment we don't know what dark matter is, but if it is a particle then we expect dark matter particles and dark matter antiparticles to annihilate with each other in the same way non-dark particles do. In fact this is only of the ways dark matter is being loo... | {
"domain": "physics.stackexchange",
"id": 35545,
"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": "particle-physics, dark-matter, antimatter",
"url": null
} |
Kolika28
Math_QED
Homework Helper
2019 Award
For ##n## large enough this becomes smaller than ##\epsilon## (archimedian property).
Kolika28
Well, I think your problem is that you don't know what ##\varepsilon## is?
The theorem says the following;
A function##f## defined and bounded in ##[a,b]## is integrable in ##[a,b... | {
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"id": null,
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"openwebmath_score": 0.9338372945785522,
... |
repeat the question. For me the problem name was a bit misleading (maybe done intentionally), as Coin Change problem is slightly different - finding the ways of making a certain change. On the other hand, if we had used a dynamic. For the greedy solution you iterate from the largest value, keep adding this value to the... | {
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9886682458008671,
"lm_q1q2_score": 0.8983216524778994,
"lm_q2_score": 0.9086178870347122,
"openwebmath_perplexity": 631.4589835219829,
"openwebmath_score": 0.6997814178466797,
"ta... |
to the center cell is the same" (12, p. Now the next step to take the determinant. Indeed, if aij 6= aji we replace them by new a0 ij = a 0 ji = aij+aji 2, this does not change the corresponding quadratic form. Examples # NOT RUN { #Create a sample 3x3 matrix mat <- matrix(1:9, ncol=3) #Copy the upper diagonal portion ... | {
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"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9910145699205375,
"lm_q1q2_score": 0.8610200024040231,
"lm_q2_score": 0.8688267847293731,
"openwebmath_perplexity": 464.864180982628,
"openwebmath_score": 0.7947157621383667,
"tags": null... |
algorithms, graphs, weighted-graphs
The idea is to minimize the amount of red nodes, by flipping some black and white nodes. What is the best algorithm to do that?
(I think this problem has something to do with some sort of cycle detection? This problem is probably well-known on some equivalent form.)
Of course it wil... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "algorithms, graphs, weighted-graphs",
"url": null
} |
quantum-optics, quantum-computer
Title: Is the DC/electro-optical Kerr effect usable in optical quantum computing? It seems from @EmilioPisanty's comments on this question that the AC/optical Kerr effect is impractical for use in optical quantum computers, which leads me to ask: would the DC Kerr effect work?
The majo... | {
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"id": 41977,
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "quantum-optics, quantum-computer",
"url": null
} |
statistical-mechanics, thermal-radiation
Now I'm confused, the base of exp(...) is e>1, so we can't use the geometric series on this point. From your
$$1 = \sum N(T) \cdot exp(- \frac {n \cdot h \cdot \omega }{2 \pi \cdot k_B \cdot T })$$
$$\frac{1}{N(t)} = \sum\ exp(- \frac {n \cdot h \cdot \omega }{2 \pi \cdot k_B \... | {
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"tags": "statistical-mechanics, thermal-radiation",
"url": null
} |
The solution is very similar to the solution in Q2421545 - Solve Least Squares (Frobenius Norm) Problem with Diagonal Matrix Constraint.
Remark
I think you can also get a closed form solution for each element in $X$ if you go through deriving the derivative with respect to each element $X$.
Another approach would be d... | {
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"lm_q1_score": 0.9525741308615412,
"lm_q1q2_score": 0.8188934551125006,
"lm_q2_score": 0.8596637559030338,
"openwebmath_perplexity": 260.22610092451447,
"openwebmath_score": 0.939202606678009,
"tag... |
large table or. This matrix can be used to obtain more detailed information about the graph. We can also scale the picture by explicitly setting the width and the height by using the width and height optional commands. There are three commonly used environments in the math mode: the math environment: Used for formulas ... | {
"domain": "effebitrezzano.it",
"id": null,
"lm_label": "1. Yes\n2. Yes",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9553191348157373,
"lm_q1q2_score": 0.864229968959003,
"lm_q2_score": 0.9046505376715775,
"openwebmath_perplexity": 1173.5944962037668,
"openwebmath_score": 0.7885562777519226,
"tag... |
organic-chemistry, nomenclature, aromatic-compounds
Title: Why is this compound named resorcinol? Substituted phenols or polyhydroxy phenols have their general name apart form IUPAC names. The general names comes from the source it is found like:-
Catechol (1,2-dihydroxybenzene)- obtained from catechu
Cresol (methylp... | {
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"id": 4912,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "organic-chemistry, nomenclature, aromatic-compounds",
"url": null
} |
fl.formal-languages, partial-order, order-theory, lattice
$$u\le x\land\bigvee_{i\in I}y_i\implies u\le\bigvee_{i\in I}(x\land y_i)$$
for all $u\in B$. The premise implies $u\le x$, and since $u$ is completely join-prime by 2, there exists $i\in I$ such that $u\le y_i$. Then $u\le x\land y_i\le\bigvee_{i\in I}(x\land ... | {
"domain": "cstheory.stackexchange",
"id": 4944,
"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": "fl.formal-languages, partial-order, order-theory, lattice",
"url": null
} |
molecular-biology, astrobiology, chirality
Does the chirality of a single compound more or less determine the chirality of all other compounds in an entire biochemistry? | {
"domain": "biology.stackexchange",
"id": 11028,
"lm_label": null,
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"tags": "molecular-biology, astrobiology, chirality",
"url": null
} |
java, simulation
private void performMaleUrination() {
if (toiletSeatPosition == ToiletSeatPosition.DOWN) {
toiletSeatPosition = ToiletSeatPosition.UP;
seatsMoved++;
}
}
private void performPoop(Gender gender) {
switch (gender) {
case FEMALE:
... | {
"domain": "codereview.stackexchange",
"id": 43984,
"lm_label": null,
"lm_name": null,
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"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "java, simulation",
"url": null
} |
ros, tcpros
Originally posted by sbragagnolo on ROS Answers with karma: 203 on 2012-09-13
Post score: 0
If you haven't yet, take a look at the ROS master and slave APIs: http://www.ros.org/wiki/ROS/Master_Slave_APIs . If you're writing a client implementation, it should provide the slave API.
There's some documentati... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "ros, tcpros",
"url": null
} |
tensorflow, recommender-system, matrix-factorisation
Title: How to factorize the Matrix in TensorFlow? (Recommender System) Given a user ratings matrix which is $n \times p$, where $n$ users rate $p$ movies, I already have a row matrix $n \times 10$ which characterises the user.
I ideally wanted to use the TF was meth... | {
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"id": 3392,
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"lm_name": null,
"lm_q1_score": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "tensorflow, recommender-system, matrix-factorisation",
"url": null
} |
quantum-mechanics, quantum-computer, eigenvalue, short-circuits
an eigenvalue is not to do with a state alone, it is to do with an state and an operator. It says something about the effect of the operator on the state.
a state vector such as $| u_0 \rangle$ does not have a phase in and of itself. It only has a relati... | {
"domain": "physics.stackexchange",
"id": 85172,
"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": "quantum-mechanics, quantum-computer, eigenvalue, short-circuits",
"url": null
} |
objective-c, ios
My problem with this approach is it doesn't really make sense why it needs to be in viewDidLoad. The property is already lazy loaded when a the tab bar controller asks it's contained view controllers for their tab bar items. This scatters the responsibility of creating and configuring the item across ... | {
"domain": "codereview.stackexchange",
"id": 3029,
"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": "objective-c, ios",
"url": null
} |
of distinct vectors in the set is orthogonal. Essential vocabulary words: linearly independent, linearly dependent. In more general terms, a basis is a linearly independent spanning set. In each part, apply the Gram Schmidt process to the given subset of Sof the inner product space V to obtain an orthogonal ⦠014 10.... | {
"domain": "theanimegallery.com",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9790357555117625,
"lm_q1q2_score": 0.8301907549730503,
"lm_q2_score": 0.8479677583778258,
"openwebmath_perplexity": 261.09145480450746,
"openwebmath_score": 0.8907818794250488,... |
slam, navigation, scan, hokuyo-node, hector-slam
Comment by kost9 on 2014-11-01:
2) [laserscan_multi_merger-2] process has died [pid 3884, exit code -11, cmd /home/youbot/catkin_ws/devel/lib/ira_laser_tools/laserscan_multi_merger __name:=laserscan_multi_merger __log:=/home/youbot/.ros/log/17d2a87e-61b1-11e4-b568-000ba... | {
"domain": "robotics.stackexchange",
"id": 19813,
"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": "slam, navigation, scan, hokuyo-node, hector-slam",
"url": null
} |
java, linked-list
public boolean addNodeAfterData(int data, int dataSearch) {
Node toAdd = new Node(data, null);
return addNodeAfterData(toAdd, dataSearch);
}
public boolean addNodeAtIndex(int index, Node toAdd) {
if(((index - numNodes) > 1) || index < 0) {
return false;
... | {
"domain": "codereview.stackexchange",
"id": 16620,
"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": "java, linked-list",
"url": null
} |
c++, array, reinventing-the-wheel
#endif
The naming for the include guard just contains a random string to avoid name clashes. Generally, I don't like (C++) macros. If you define all the types why not use them?
const T* begin() const noexcept
// More informative to write:
const_iterator begin() const no... | {
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"openwebmath_score": null,
"tags": "c++, array, reinventing-the-wheel",
"url": null
} |
java, http
Your code is using a case-sensitive match, and also, it is not very efficient.
HTTP allows some headers to be present multiple times:
Multiple message-header fields with the same field-name MAY be present in a message if and only if the entire field-value for that header field is defined as a comma-separat... | {
"domain": "codereview.stackexchange",
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "java, http",
"url": null
} |
particle-physics, experimental-physics, electrons, wave-particle-duality
Title: What is an example of an electron acting as a particle? I'm aware that, like all quantum objects (I think), an electron can act as both a wave and a particle. Electron diffraction is a good example of how an electron can act as a wave, but... | {
"domain": "physics.stackexchange",
"id": 77287,
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"lm_q1_score": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "particle-physics, experimental-physics, electrons, wave-particle-duality",
"url"... |
ros, jenkins, buildfarm
Summarised: How to build a repository in a Jenkins "Development Test" against other repositories that are also not yet released as debian packages?
Anyone has an idea?
Thanks,
Marc | {
"domain": "robotics.stackexchange",
"id": 19035,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "ros, jenkins, buildfarm",
"url": null
} |
php, mvc
public function getDeliveryRequestEmailAddresses($custpoid)
{
//If a ShipToID is set, we want to return all email addresses associated with that customer, otherwise just return whatever email addresses are associated with the BillToID
$sql = "SELECT
CASE
... | {
"domain": "codereview.stackexchange",
"id": 10100,
"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": "php, mvc",
"url": null
} |
evolution, terminology, natural-selection, computational-model, definitions
So in some sense "evolution" is determined by the struggle of those two kinds of mechanism of change.
If random change prevails, then evolution would not necessarily move in the direction of increasing adaptation of living organisms with thei... | {
"domain": "biology.stackexchange",
"id": 9623,
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"lm_name": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "evolution, terminology, natural-selection, computational-model, definitions",
"ur... |
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