text stringlengths 1 1.11k | source dict |
|---|---|
# An application of probability in tennis game
I am playing in a tennis tournament, and I am up against a player I have watched but never played before. Based on what I have seen, I consider three possible models for our relative strengths:
• Model A: We are evenly matched, so that each of us is equally likely to win... | {
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quantum-mechanics, angular-momentum, quantum-spin, group-theory, group-representations
How does it look like and how to describe it? I am at lost here because the standard representation of $SO(3)$ is $3\times 3$ orthogonal matrix while any operators in $\mathbb C^{2S+1}$ must be $(2S+1)\times(2S+1)$. The issue is tha... | {
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"tags": "quantum-mechanics, angular-momentum, quantum-spin, group-theory, group-representat... |
javascript
_checkIfNeeded: function(obj) {
if (!obj)
return;
var self = MemoryLeak;
self.checked++
if ((self._isArray(obj) || self._isObject(obj))) {
if(obj.__leaks_checked == self.uniq_id)
return;
obj.__leaks_checked = self.uniq_id
setTimeout(self._partial(self.check... | {
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#### Yakov Pechersky (Nov 23 2020 at 03:25):
Does this help?
import data.real.basic
variables {α : Type*} [linear_order α] {n : ℕ}
def fin_max : Π {n : ℕ} (f : fin (n + 1) → α), α
| 0 f := f 0
| (m + 1) f := max (f (fin.last (m + 1))) (fin_max (fun i : fin (m + 1), f i.cast_succ))
example (f : fin (n + 1) → ... | {
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"openwebmath_score": 0.3846169710159302,
"tags": ... |
general-relativity, experimental-physics, gravitational-waves, ligo
Title: Why is the detection of gravitational waves so significant? LIGO has announced the detection of gravitational waves on 11 Feb, 2016. I was wondering why the detection of gravitational waves was so significant?
I know it is another confirmation... | {
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"tags": "general-relativity, experimental-physics, gravitational-waves, ligo",
"url": nul... |
operating-systems, search-algorithms, filesystems
But when it comes to scanning whole directory structures, there is no such thing as "core scanning": there isn't a common implementation for that.
I think depth-first is more popular; e.g. GNU find only supports depth-first scanning. This may be due to depth-first sca... | {
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"tags": "operating-systems, search-algorithms, filesystems",
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} |
homework-and-exercises, newtonian-mechanics, forces, friction, free-body-diagram
The importance of the dimensions of the blocks is that it allows you to calculate the position of the tower's centre of gravity (assuming each block has the same weight as all of the others). | {
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"tags": "homework-and-exercises, newtonian-mechanics, forces, friction, free-body-diagram",... |
transform-fault
Title: Is San Andreas fault horizontal or vertical? I was reading a book about tectonic plate boundaries, and I came across this paragraph:
It says that when a plate edge slides with another plate edge it causes a vertical fault, as San Andreas fault. I thought that SAF is a horizontal fault i.e. stri... | {
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"openwebmath_score": null,
"tags": "transform-fault",
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solar-system
Title: What is the definition of the "solar mixing ratio"? What is the definition of the "solar mixing ratio"?
Specifically, I'd like to know why the ratio of H2 and He is 0.84 and 0.16 at the "solar mixing ratio" as shown in Table I in The Galileo Mission. An answer which explains it possibly, but remain... | {
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"tags": "solar-system",
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ros, compile, win-ros
And i think that's it. I hope i'm not forgetting anything. I will try to compile win_ros in Debug and also will try to compile it with msvc2012.
Originally posted by Eugene Simine on ROS Answers with karma: 51 on 2013-07-30
Post score: 0
Can you join us on the https://groups.google.com/forum/#!... | {
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# General Integrating Factor
#### Metronome
##### New member
Consider the differential equation 2y dx + 3x dy = 0. Determine conditions on a and b so that u(x, y) = (x^a)(y^b) is an integrating factor. Find a particular integrating factor and use it to solve the differential equation.
There is a remote possibility th... | {
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"openwebmath_score": 0.9133257865905762,
"tags... |
javascript, jquery, beginner, json
function buildTables( data , config )
{
var html = ""
for( var i = 0; i < config.length ; i++ ){
html += buildTable( data , config[i] );
}
$('ul.elements-list').html( html );
}
From there you can simply change your listeners to
$.getJSON("json/a2.json", function(data) ... | {
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and Modus Tollens Hypothetical Syllogism University of California, Irvine. Disjunctive Syllogism, that is, the inference from 'not-A or B' and 'A', to 'B' can lead from true premises to a false conclusion if each of the sentences 'A' and 'not-A' is a statement of a partial truth such that affirming one of them amounts ... | {
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"openwebmath_score": 0.5895121097564697,
"tag... |
c++, c++11, homework, template, set
assert(6 == set.size());
assert(6 == set.getCapacity());
assert(1 == set.contains("three"));
assert(0 == set.contains("ten"));
assert(1 == set.count("one"));
assert(1 == set.remove("one"));
assert(0 == set.count("one"));
assert(0 == set.remove("one"));
... | {
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"tags": "c++, c++11, homework, template, set",
"url": null
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c#, beginner, programming-challenge
Title: Add multiples of 3 or 5 below 1000, Can this code be optimised. Project Euler #1 I have seen some solution here for the same problem, this and this I have found better ways to solve this problem. I just want to know how good or bad my code and way of approaching this problem ... | {
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There are however more complicated functions f whose riemann integral exists on [a,b] and such that an antiderivative F in this sense, i.e. F continuous everywhere and derivative equal to f where f is continuous, does not satisfy 3). an example is the characteristic function f of the cantor set, which is zero off the c... | {
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"openwebmath_score": 0.9401713013648987,
... |
You can add symbols like summations, integrals, and greek letters with the equation editor, but it is also possible to add them by typing "\sum" "\hat", "\alpha", etc into the equation. How to Use LaTeX Math Equations in Google Docs Posted December 11, 2015 by Ashley Blood in Google Docs Google Docs is an excellent too... | {
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"lm_q2_score": 0.8902942203004185,
"openwebmath_perplexity": 2290.2394508185025,
"openwebmath_score": 0.1892908215522766,
... |
navigation, ekf, odometry, ros-melodic, robot-localization
initial_estimate_covariance: [0.01, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, # x
0, 0.01, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, # ... | {
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"tags": "navigation, ekf, odometry, ros-melodic, robot-localization",
"url": null
} |
quantum-field-theory, mathematical-physics, differential-geometry, foundations, category-theory
Title: Are identity types interpreted physically in an infinity-topos formulation of equations of motion? In reference to Urs Schreibers paper/book on foundations of field theory Differential cohomology in a cohesive infini... | {
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"tags": "quantum-field-theory, mathematical-physics, differential-geometry, foundations, ca... |
eyes, nomenclature, neuroanatomy
Title: Difference between 'Orbit' and 'Globe' in eye anatomy? What's the difference between 'Orbit' and 'Globe' in eye's anatomy. Do they refer to the same ? I encountered this in this text:
... ciliary ganglion, which is approximately 3 mm in size, and located
2-3 mm posterior to t... | {
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at face value, but it's kind of interesting - all functions that do what we want have $f(1)=0$. \begin{align} f(xy) &= f(x) + f(y) &(x\ne 0,\, y\ne 0) \\[8pt] \text{differentiating with respect to $x$} \implies y f'(xy) &= f'(x) \\ f'(xy) &= \frac{f'(x)}{y} \\ \text{differentiating the original equation with respect to... | {
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"openwebmath_score": 1.0000100135803223,
"tags... |
c++, random, c++17
}
// public
template <size_t N>
using rand_t = typename detail::rand_type<N>::type;
using rand32_t = rand_t<32>;
using rand64_t = rand_t<64>;
template <size_t N>
inline rand_t<N> rot(rand_t<N> x, rand_t<N> k) noexcept { return ((x << k) | (x >> (N - k))); }
templa... | {
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"tags": "c++, random, c++17",
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graph-algorithms, shortest-path
Clearly any set of $\{w_{ij}\}$ satisfying these constraints represents an st-path, as long as $w_{ij}$ is not straight $0$.
Now let us drop the integral constraints:
$w_{ij} \in [0,1]$, $w_i \in [0,1]$,
$w_i = \sum_{k: (k, i) \in E} w_{ki}$ for all $i$,
$w_i = \sum_{j: (i,j) \in E} ... | {
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”.) Addition and subtraction of complex numbers is easy in rectangular form. $\text{Complex Conjugate Examples}$ $\$$3 \red + 2i)(3 \red - 2i) \\(5 \red + 12i)(5 \red - 12i) \\(7 \red + 33i)(5 \red - 33i) \\(99 \red + i)(99 \red - i) I get -9 root 2. Rectangular Form of a Complex Number. We sketch a vector with initial... | {
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"openwebmath_perplexity": 364.2756635850276,
"openwebmath_score": 0.7707651257514954,
"tags": null... |
The average British man is 175. The alternative hypothesis is different depending on which version of the test is used, but is usually stationarity or trend-stationarity. How to Write a Hypothesis. 2 The independence (IND) hypothesis. Hypothesis Testing in Python: Collecting S&P 500 Data. Use the COMPUTE worksheetof th... | {
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"lm_q1_score": 0.9669140197044659,
"lm_q1q2_score": 0.8057532301693163,
"lm_q2_score": 0.8333245911726382,
"openwebmath_perplexity": 892.1148046656648,
"openwebmath_score": 0.5146912336349487,
... |
electrical-engineering, terminology, wireless-communication, rf-electronics, digital-communication
Title: What is Byte Alignment Time in radio communication? According to this paper, which deals with time synchronization in wireless networks, this kind of delay occurs, however I do not understand its explanation. The ... | {
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"openwebmath_score": null,
"tags": "electrical-engineering, terminology, wireless-communication, rf-electronics, dig... |
dna-sequencing, human-genome, repeatitive-sequence
In six papers in Science, the Telomere-to-Telomere (T2T) Consortium—named for the chromosomes’ end caps—fills in all but five of the hundreds of remaining problem spots, leaving just 10 million bases and the Y chromosome only roughly known. And today, the T2T consorti... | {
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"tags": "dna-sequencing, human-genome, repeatitive-sequence",
"url": null
} |
solar-system, asteroids, apparent-magnitude, magnitude, absolute-magnitude
On the contrary I find it much easier to grasp the idea of stellar absolute magnitude $M$, where the luminosity of the star gets scaled to the 10 parsec distance using the inverse square law.
Thank you ! and 0 must appear because the vast majo... | {
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"tags": "solar-system, asteroids, apparent-magnitude, magnitude, absolute-magnitude",
"u... |
gazebo, roslaunch, ar-pose
process[rviz_marker-10]: started with pid [3694]
Service call failed: transport error completing service call: unable to receive data from sender, check sender's logs for details
Aborted (core dumped)
[gazebo-2] process has died [pid 3518, exit code 134, cmd /home/lm/fuerte_workspace/simulat... | {
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"tags": "gazebo, roslaunch, ar-pose",
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c#, asp.net-core, .net-core
// Finally I do some work to convert it to a Thing and send it back
return newThing;
}
_getOtherThing is a method that performs a very specific concrete call to another API to get the data I needed. It's a method that takes a string and returns a Task<OtherThing>. There are issues wi... | {
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"tags": "c#, asp.net-core, .net-core",
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combinatorics, packing
Now, we can do the following: start from some submultiset $X$, such that $\mathrm{sum}(X) \leqslant \mathrm{sum}(U) / 2$ and gradually change it to its complement $U \setminus X$ by replacing its elements with elements of its complement, for which $\mathrm{sum}(U \setminus X) \geqslant \mathrm{s... | {
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"tags": "combinatorics, packing",
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performance, sql, sql-server
,WARR_TAX_RATE = (select WARR_TAX_RATE FROM CEQBA WHERE PRNCPL_ACC_CD = @DealerCode and BRANCH_ACC_CD = @FromBranch)
,DOC_LANG_CD = (select DOC_LANG_CD FROM CEQBA WHERE PRNCPL_ACC_CD = @DealerCode and BRANCH_ACC_CD = @FromBranch)
,ESCALATOR_FACTOR = (select... | {
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of the graph. Title: Polar Coordinates and Graphing 1 Polar Coordinates and Graphing r directed distance directed angle Polar Axis O Counterclockwise from polar axis to. Avis, review, photos dans l'article. The circle's diameter is the absolute value of a. Cardioids are a special case of. 2r 2= a · sin(2 ) r 2 = a 2 · ... | {
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"openwebmath_perplexity": 2009.7685798538423,
"openwebmath_score": 0.7826905250549316,
"ta... |
lambda-calculus
$$(\lambda x. x \text{ } x ) ( \lambda x . x \text{ } x )= (\lambda x. x \text{ } x) ( \lambda x . x \text{ } x)$$
Source
I am a bit confused on how this composition was done. When I do it, I get:
$$ \lambda x. (\lambda x. x \text{ } x) (\lambda x . x \text{ } x)$$
On what basis do I drop the exterio... | {
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school in my teaching of Analysis, I am for. Certain problem might be different = ai^2 * ei already strong book 's educational value got of a... Sheet content of the rest of your life they can have some thing that would help them to learn from! That they can have an orthonormal basis consisting of eigenvectors of R. le... | {
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"lm_q2_score": 0.8976952818435994,
"openwebmath_perplexity": 1203.877316008927,
"openwebmath_score": 0.4788626730442047,
"tags": null,
... |
= − = = − = = = An exponential function is a function of the form f x a( ) = x, where a is a positive real number (a > 0. The asymptotic limit is the x-axis. y = 1x Filesize: 403 KB Language: English. Exponential Growth and DecayWorksheet 1. In an exponential function, the variable is part of the exponent. In spite of ... | {
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"openwebmath_perplexity": 1027.1436833507375,
"openwebmath_score": 0.5688568353652954,
"tags": null... |
newtonian-mechanics, mass
$$ x_{cm} = \frac{\int x\ dm}{\int dm},\ \ \ \text{The position vector is }x = Rcos(\theta) $$
$$ y_{cm} = \frac{\int y\ dm}{\int dm},\ \ \ \text{The position vector is }y = Rsin(\theta), $$
but what is $dm$? It feels reasonable that $dm$ is the mass of the point particle whose location is gi... | {
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"url": null
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I noticed that it was mentioned in passing that products, co-products and exponentials are all examples of adjunctions. And I just listened to the first 10 seconds of lecture 8, and I gather that they are discussed therein, so I look forward to reviewing that lecture too in time. | {
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"openwebmath_perplexity": 613.6969684394298,
"openwebmath_score": 0.8684090375900269,
"ta... |
atomic-physics
Title: Is it possible to isolate an individual atom? I was reading about molecules and wondering about whether they could be individually isolated and "held" or "photographed" in some sense.
Google showed that a rubidium atom was isolated, but it left out lower-level details.
Is it possible to isolate a... | {
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"url": null
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php, mysql, security, pdo
You then make a white-list by fetching an array of tables inside the selected database and check if your provided table name exists in the array. After this you check if the table name is valid. Checking if the table name is valid should be done before the database query is issued (saving ser... | {
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"tags": "php, mysql, security, pdo",
"url": null
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thermodynamics, statistical-mechanics, terminology, lattice-model
For finite $k_{\rm max}$, the results would be essentially the same as long as $k_{\rm max} \gg a^{-1/3}$. When $k_{\rm max} \ll a^{-1/3}$, I'd expect that the confining potential plays no role. This should be easy to prove.
The higher-dimensional analo... | {
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"tags": "thermodynamics, statistical-mechanics, terminology, lattice-model",
"url": null
... |
evolution, cardiology, anatomy, life
Title: How did the cardiovascular system evolve? How has evolution created our blood, lungs and the heart?
We can't exist without blood, which transports the oxygen to all areas of our body. However, the blood needs a lung, which gives it the oxygen to transport. The blood also nee... | {
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"openwebmath_score": null,
"tags": "evolution, cardiology, anatomy, life",
"url": null
} |
lab-techniques, synthetic-biology, bioluminescence
My question, then, is this: should I expect that a typical current fluorescence plate reader will also be able to measure luminescence, or is this a much more specialized capability? As the other answers here say, technically plate readers which are capable of fluores... | {
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"openwebmath_score": null,
"tags": "lab-techniques, synthetic-biology, bioluminescence",
"url": null
} |
ros, tf-conversions
Originally posted by Wim with karma: 2915 on 2012-03-06
This answer was ACCEPTED on the original site
Post score: 0 | {
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"url": null
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c++, optimization, c++11, array
Can anyone spots any problems or suggestions for improvement on this technique? I have a few things to say about your code:
Do you intend to actually do things in the constructors instead of just displaying strings? Knowing this would help the review process. Currently, you do not stor... | {
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# Quick parametric equation question
1. Nov 19, 2009
### fball558
1. The problem statement, all variables and given/known data
Find a parametric representation for the lower half of the ellipsoid 3x^2 + 5y^2 + z^2 = 1
x=u
y=v
z=??
we need to find what z is
3. The attempt at a solution
i solved the equation for ... | {
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"tag... |
python, object-oriented, game, python-3.x, tic-tac-toe
def clear(self) -> None:
"""Make the board empty."""
for cell in self.cells:
self.cells[cell] = Cell.empty
def get_token_cells(self, token: Token) -> list:
"""Return a list of all cell numbers/keys occupied by the provided ... | {
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"tags": "python, object-oriented, game, python-3.x, tic-tac-toe",
"url": null
} |
php, mysqli, securestring
$rows = array();
while ($row = $result->fetch_assoc()) {
$rows[] = $row;
}
return $rows;
}
}
When I want infomation from the DB
Example:
$db = new db();
$result = $db->select("SELECT * FROM users WHERE name = John"); You're asking the wrong question. ... | {
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• The curl of the E-field depends on dB/dt according to Faraday's law, which is also a cosine function and zero at the same point. i.e. E and B are out of phase with their curls. Jun 20 '14 at 7:18
• Yes, you've got it. This applet falstad.com/emwave1 allows you to look at this stuff. You can set up a plane wave and th... | {
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"lm_q2_score": 0.8267117962054049,
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"openwebmath_score": 0.7587857246398926,
"ta... |
circuit-complexity, complexity
Edit 2: Looks like Andrew Morgan highlighted this already. Whoops :) | {
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• So that means that the question should still mention that the function is differentiable everywhere, correct? So that the cauchy riemann equations when satisfied, imply the analyticity of $f(z)$ 100 % (even at zero) – khaled014z Jan 6 at 23:49 | {
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"openwebmath_score": 0.8011120557785034,
"ta... |
error-correction
Time goes from top to bottom. The cubes have size $d \times d \times d$ ($d$ data qubits by $d$ data qubits by $d$ rounds). Empty space is the normal surface code checkerboard pattern of crosschecks. Black surfaces are Z type boundaries in the surface code. White surfaces are X type boundaries in the ... | {
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"openwebmath_score": null,
"tags": "error-correction",
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} |
ros, external-libraries, libraries, android
For Installation i followed the Tutorial
can t find the sources in android studio - android_core (packages view or project view) and also not in my directories
Originally posted by stefan on ROS Answers with karma: 15 on 2014-08-04
Post score: 0
If your IDE can properly i... | {
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vba
And errBox should be called ShowErrorBox or similar, i.e. it should start with a verb, too.
Avoid comparing a Boolean with True or False like this:
If bool = True Then
boolAsString could be written like this:
Private Function boolAsString(ByVal value As Boolean) As String
boolAsString = IIf(value, "T", "F")... | {
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newtonian-gravity, rotational-dynamics
Title: Time period of a satellite close to earth The time period $T$, of a satellite revolving around the earth and close to it is given by, $$T = \frac{2\pi r}{v}$$ where $v$ is the linear velocity of the satellite and roughly equal to $8\ \mathrm{ km/s}$. Why are we not taking ... | {
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"tags": "newtonian-gravity, rotational-dynamics",
"url": null
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There are more innovative ways to solve this question. A few of them have not been discussed here. Can you all think of any other way to solve it? Would love to see a few other methods!
I will post two more ways to solve this question tomorrow. In the mean time, expecting some more responses with other ways to solve t... | {
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"openwebmath_score": 0.6533068418502808,
"tags... |
bigdata, databases, binary, version-control
I know that others in science seem to have similar problems, yet I couldn't find a good solution.
I want to use the storage facilities of my institute, so I need something that can use a "dumb" server. I also would like to have an additional backup on a portable hard disk, b... | {
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"openwebmath_score": null,
"tags": "bigdata, databases, binary, version-control",
"url": null
} |
gas-laws, van-der-waals-behavior
Title: Are van der Waals coefficients independent of temperature? In the van der Waals equation for real gases, the coefficients $a$ and $b$ are used as respective correction terms for pressure and volume in the ideal gas equation.
I want to know whether the van der Waals coefficients ... | {
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"tags": "gas-laws, van-der-waals-behavior",
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} |
homework-and-exercises, electromagnetism, electrostatics, dipole, dipole-moment
Title: Force between two dipoles I am extremelly confused with this question: Basically suppose we have two electric dipoles, parallel to each other, as follows in the figure: | {
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... |
c++, template-meta-programming, enum
constexpr EnumMapperRange() : mapping(), start(static_cast<std::underlying_type_t<Enum>>(m)), end(static_cast<std::underlying_type_t<Enum>>(M))
{
// Same as a for loop, but with constexpr friendly i
//for (auto i = 0; i < end - start + 1; ++i)
... | {
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"openwebmath_score": null,
"tags": "c++, template-meta-programming, enum",
"url": null
} |
ros, rosdep, ros-fuerte, dependencies, debian
rviz: No definition of [python-qt-bindings] for OS [debian]
gazebo_worlds: Missing resource protobuf
ROS path [0]=/opt/ros/fuerte/share/ros
ROS path [1]=/home/john/ros/navigation
ROS path [2]=/home/john/ros/diagnostics
ROS path [3]=/home/john/ros/common
ROS path [4]=/home/... | {
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transform
And see #q270403 for a related question.
Originally posted by gvdhoorn with karma: 86574 on 2017-10-06
This answer was ACCEPTED on the original site
Post score: 4
Original comments
Comment by BuilderMike on 2017-10-06:
thanks for this answer. I now understand. thanks. | {
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c++, statistics, machine-learning
template <typename T>
class quartile : public median<T>
{
public:
std::map<std::string, T> get_quartile(std::vector<T> vec, bool sorted = false)
{
if (sorted == false) std::sort(vec.begin(), vec.end());
std::map<std::string, T> result;
result["q2"] = th... | {
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"tags": "c++, statistics, machine-learning",
"url": null
} |
urdf, joint, rotation
Title: Can I change the axis of rotation of the joints from urdf file? I have a custom robot that is exported from fusion 360. In fusion I have no problems about the rotation of the joints. However when I export it to ros2 and use setup_assistant of the moveit2. The axis of rotation are different... | {
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"tags": "urdf, joint, rotation",
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} |
This is just a vocabulary convention...
While a real number is $r$ in $(-\infty,\infty)$, a purely imaginary number is a product $r\cdot i$.
If we are using the notation $a+bi$ for arbitrary complex numbers, the purely real numbers have $b=0$ while the purely imaginary numbers have $a=0$.
For $p(x)=x^2+4$, the roots... | {
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gazebo
Originally posted by Cherry on Gazebo Answers with karma: 17 on 2013-04-02
Post score: 0
I think we have fixed the spawn/delete problem in the default_worldname branch. This branch will be merged into default by the end of the week, and made available via nightly builds.
You can visually see contacts through t... | {
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python, genetic-algorithm
childDurationGenes = np.zeros(numDurationGenes, dtype=int)
childStartTimeGenes = np.zeros(numDurationGenes, dtype=int)
for d in range(
numDurationGenes): # for every gene pair, decide at random which parents genes
p = random.sample(range(1, 3), 1) ... | {
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Solving this for , we get:
if is located in either the first or second quadrant.
if is located in the third or fourth quadrant.
Example 1: Determine the exact value of .
Solution: Using the half angle identity, , and is located in the first quadrant. Therefore, .
Plugging this into a calculator, . Using the sine f... | {
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"openwebmath_score": 0.9472673535346985,
"tags": null,
... |
graphs, regular-languages, time-complexity
Have some subgraphs you consider "complex", and test for subgraph isomorphism in your actual graphs (NP-complete), or, use Maximum common subgraph isomorphism (NP-hard)
Perhaps some sort of compressibility/entropy measure, but this touches on isomorphism; the same graph can b... | {
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on this technique, please visit this page. A binomial is a sum of two terms. Factorise by grouping the four terms into pairs. Website and our Privacy and Other Policies. Previously, we went over how to factor out a quadratic trinomial with a leading coefficient of 1. They take a lot of the guesswork out of factoring, e... | {
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"openwebmath_score": 0.6123183965682983,
"tags": nul... |
If you graph that, you obtain a line y=1
3. Originally Posted by dwsmith
????
If you graph that, you obtain a line y=1
dwsmith, sorry just made some changes to the formula.
4. Originally Posted by Oiler
dwsmith, sorry just made some changes to the formula.
It is -1 when you go to negative infinity.
5. Originally Po... | {
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"openwebmath_score": 0.8911778330802917,
"ta... |
deep-learning, classification, predictive-modeling
Title: Predict correct answer among ten answers for a given question I have a case study to solve where I am given a dataset of questions and its answers, there are ten answers for a particular question.
It's a classification problem where correct answer is having c... | {
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1-1), for example, but odd functions would pass (1-1)). Wow! You have learned many different strategies for solving systems of equations! First we started with Graphing Systems of Equations. It's unit vector is given by the following:. Algebra Worksheets, Quizzes and Activities. A typical example would be taking the li... | {
"domain": "rciretedimpresa.it",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.990874360724436,
"lm_q1q2_score": 0.8101135798364703,
"lm_q2_score": 0.8175744695262777,
"openwebmath_perplexity": 524.9600959979937,
"openwebmath_score": 0.6085191369056702,
... |
condensed-matter, solid-state-physics, quantum-spin, second-quantization, phonons
Question 2 Does it mean that the spin degrees of freedom of phonons and its polarization states have no connection with each other? Answer to Question 1:
The spin of a quasi-particle or collective mode in Condensed matter is purely deter... | {
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"tags": "condensed-matter, solid-state-physics, quantum-spin, second-quantization, phonons"... |
c, parsing
One very good way to do that would be to make it an array of pointers:
const char *keywords[]=
{
"auto","break","case","char",
"const","continue","default","do","double",
"else","enum","extern","float",
"for","goto","if","int","long",
"register","return","short","signed",
"sizeof","s... | {
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"id": 15040,
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"openwebmath_score": null,
"tags": "c, parsing",
"url": null
} |
lo.logic, model-checking, temporal-logic
If you have a reasonable explanation for the above I might post a second analogous example which might disprove your intuition. Intuitively, what happens here is that for $AFGp$, you check each individual path for whether after some point, $p$ will always be true - no matter wh... | {
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"lm_q2_score": null,
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"tags": "lo.logic, model-checking, temporal-logic",
"url": null
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computational-physics, simulations, plasma-physics
As an aside, a true Vlasov simulation should be as close to time-reversible as one can get in a kinetic simulation. The main issues here become rounding errors for small parameters and/or "bad" boundary conditions (e.g., truly open boundary conditions may cause irrev... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "computational-physics, simulations, plasma-physics",
"url": null
} |
html, css, sass
<textarea cols="30" rows="10" class="footer__input"></textarea>
<button class="footer__btn">Send</button>
</div>
</div>
</footer>
<div class="footer__rights">© 2020 All Rights reserved.</div> | {
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"id": 39366,
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"tags": "html, css, sass",
"url": null
} |
quantum-mechanics, solid-state-physics, symmetry, linear-algebra, many-body
Title: Many Body Physics: Hamiltonian block structure and Symmetries Consider a many body problem of a small cluster, e.g. the 'Hubbard-Cluster' (albeit the question may be of relevance for other Hamiltonians as well):
$$\mathcal{H}=\sum_{<ij>... | {
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"tags": "quantum-mechanics, solid-state-physics, symmetry, linear-algebra, many-body",
"u... |
regression
Title: How to assess predictive power of each predictor in case of linear regression For a predictive model with binary target, we can assess the predictive power of each predictor by calculating their information value. What is the equivalent of IV when the target variable is continuous? Should I look at $... | {
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"tags": "regression",
"url": null
} |
`[0.6350 0.0780 0.1840]``'#A2142F'`
Line width, specified as a positive value in points, where 1 point = 1/72 of an inch. If the line has markers, then the line width also affects the marker edges.
The line width cannot be thinner than the width of a pixel. If you set the line width to a value that is less than the w... | {
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"lm_label": "1. YES\n2. YES",
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"lm_q1_score": 0.9817357200450139,
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"lm_q2_score": 0.847967764140929,
"openwebmath_perplexity": 1397.3627042285625,
"openwebmath_score": 0.8812602758407593,
"tags": ... |
c, linked-list, memory-management
Updated SLList.h
#ifndef SINGLYLINKEDLIST_
#define SINGLYLINKEDLIST_
#include <stdlib.h>
typedef struct SLList SLList;
// Create SinglyLinkedList
SLList *SLList_create(void);
// Get information about SinglyLinkedList
size_t SLList_length(SLList *list);
// Get data from SinglyLink... | {
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"tags": "c, linked-list, memory-management",
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} |
When $n\equiv 4 \pmod{5}$, we can only hit all residues $\bmod 5$ once we get to $4n$ (since $n$ and $n+1$ only contribute $1$ more residue $\bmod 5$). Looking at multiples of $4$ greater than $91$ with $n\equiv 4\pmod{5}$, we get $n=24$. It's easy to check that this works. Furthermore, any $n$ greater than this does n... | {
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"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9914225161069058,
"lm_q1q2_score": 0.8011360392090414,
"lm_q2_score": 0.8080672227971211,
"openwebmath_perplexity": 101.3253183452252,
"openwebmath_score": 0.841289758682251,
... |
ros, gazebo, rviz, urdf, 3dcamera
</depth_camera>
<clip>
<near>0.1</near>
<far>100</far>
</clip>
</camera>
<plugin name="camera_controller" filename="libgazebo_ros_openni_kinect.so">
<baseline>0.2</baseline>
<alwaysOn>true</alwaysOn>
... | {
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"id": 31599,
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"openwebmath_score": null,
"tags": "ros, gazebo, rviz, urdf, 3dcamera",
"url": null
} |
classical-mechanics, lagrangian-formalism, coordinate-systems, constrained-dynamics
Title: Transformation equations from Generalized coordinates to rectangular I've a proper set of generalized coordinates {$q_j$} ,$j=1...n$ for a system. This set determines the configuration of the system, also these can be used to de... | {
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"lm_q2_score": null,
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"tags": "classical-mechanics, lagrangian-formalism, coordinate-systems, constrained-dynamic... |
algorithms, arrays
Title: Recover an array from its insertion indices An array is built starting with an empty array, and then a sequence of insertions:
insert $a_1$ at index $z_1=1$
insert $a_2$ at index $z_2$
insert $a_3$ at index $z_3$
... | {
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"id": 15650,
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "algorithms, arrays",
"url": null
} |
lexicographically If f(n) = n2 + 3n, then as n becomes very large, the term 3n becomes insignificant compared to n2 Q: 1 rìChoose ε = ½ c > 0 Here’s the plot of running time for Linear Search with respect to input size We consider a differential system of neutral type with distributed delay Asymptotic series 21 3 For e... | {
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"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9845754452025767,
"lm_q1q2_score": 0.8388118148409776,
"lm_q2_score": 0.8519528076067262,
"openwebmath_perplexity": 713.1614358094596,
"openwebmath_score": 0.5939570665359497,
"t... |
filters, delta-sigma
Then the actual noise shaping (left some redundancy in the code, to keep it closer to Lipshitz 1991):
l = 200000
ts = np.arange(l)/fDAC
wav = 0.55 * np.sin(2*np.pi*3200*ts)
errbuf = np.zeros_like(b)
samps = np.zeros_like(wav)
for iSAM in range(l):
desired = wav[iSAM] - np.dot(b, errbuf)
sa... | {
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"tags": "filters, delta-sigma",
"url": null
} |
qiskit, quantum-state, quantum-algorithms, circuit-construction, linear-algebra
If the above algorithm doesn't work for general quantum states, what algorithm would you suggest? Suppose $\langle\phi|\psi\rangle = re^{i\theta}$. As you have noticed, if we have access to multiple copies of the state, then we can measure... | {
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"tags": "qiskit, quantum-state, quantum-algorithms, circuit-construction, linear-al... |
cc.complexity-theory, complexity-classes, gt.game-theory
It turns out that even a simple tree structure for each game, with constant depth and really only one meaningful fork per game (namely those at the start which force Bob to choose a truth assignment) is sufficient to get NP-hardness. I had some ideas for getting... | {
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"openwebmath_score": null,
"tags": "cc.complexity-theory, complexity-classes, gt.game-theory",
"url": null
} |
discrete-signals, step-response
above s[n] denotes step response
please tell me where i'm doing wrong(or if i'm doing conceptual mistake)
,and provide solution if possible ....thank you. The given impulse response is unbounded for $n\rightarrow -\infty$, and, consequently, the corresponding step response is also unbou... | {
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"tags": "discrete-signals, step-response",
"url": null
} |
ros2, roslaunch
Original comments
Comment by kwang on 2021-02-17:
Hi @relffok, have you figured out how to use a launch argument as a string? I'm trying to pass an argument (file path) to open(yaml_file, 'r').read() function and it gives me the following error when I launch it:
TypeError: expected str, bytes or os.Pat... | {
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"tags": "ros2, roslaunch",
"url": null
} |
javascript, linked-list, file-system
while( root.parent )
root = root.parent;
return root;
};
//Add a child, either a simple node or a path
Node.prototype.addChild = function( part , type )
{
if( this.type != this.DIR ){
throw new Error('A file node cannot have any children');
}
var node = (new Node(... | {
"domain": "codereview.stackexchange",
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"tags": "javascript, linked-list, file-system",
"url": null
} |
ruby, genetic-algorithm
Also note that I included Comparable, implementing <=> based on fitness. This means that you can now compare individuals to each other such that an individual is greater than another if and only if its fitness is greater. This allows you to use > on two individuals as well as methods like max t... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "ruby, genetic-algorithm",
"url": null
} |
fluid-dynamics
Title: Fluid dynamics? What will happen to liquid pressure and flow rate in a system that splits and recombines the the flow of liquid? This question has to do with sending liquid coolant at a temperature of -25C thru standards computer water cooling components, like a CPU Waterblock, GPU Waterblock, an... | {
"domain": "physics.stackexchange",
"id": 19594,
"lm_label": null,
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "fluid-dynamics",
"url": null
} |
complexity-theory, turing-machines, computability, time-complexity, p-vs-np
In Step 3, we go over all nodes in $G$ ($n$ nodes), and check all its neighbors ($n-1$ neighbors), so there are at most $n(n-1)$ repetitions of the inner part.
As for how many steps does this take when implemented on a Turing machine, this dep... | {
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"tags": "complexity-theory, turing-machines, computability, time-complexity, p-vs-np",
"url": ... |
fraction and pressing space: 1/2 1 2 {\displaystyle {\frac {1}{2}}} Linear fraction (resp. \nleqq \preceq \deg, \det A matrix having $$n$$ rows and $$m$$ columns is a $$m\times n$$-matrix. Operators (class 1) are rendered with spaces. \lvertneqq \downharpoonleft \varpi \nparallel They are organized into seven classes b... | {
"domain": "fnfsurplus.com",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9579122744874228,
"lm_q1q2_score": 0.8023664422912158,
"lm_q2_score": 0.837619961306541,
"openwebmath_perplexity": 3984.808390044718,
"openwebmath_score": 0.9823776483535767,
"tag... |
homework-and-exercises, fluid-statics, surface-tension
I am not sure which one of the answers is correct. In order to find excess pressure balance the force due to excess pressure with force due to surface tension .($R=d2/2 \ , \ r=d1/2$)
$ΔP \timesπ(R^2-r^2)=2π(R+r)T$
$ΔP=2T/(R-r)$
Then if you equate it with weight... | {
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"tags": "homework-and-exercises, fluid-statics, surface-tension",
"url": null
} |
• It looks great, you have effectly showed that if the property $G_{i}=3^i-2^i$ holds for $i\in\{1,2,\dots n-1\}$ then $G_{n}=3^n-2^n$ also. – Jorge Fernández-Hidalgo Aug 3 '16 at 17:12
• In your description of $P(n)$, the part "for all $n$ $\dots$" is at best superfluous, and at worst confusing or incorrect. Better, f... | {
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"lm_q1_score": 0.9891815523039174,
"lm_q1q2_score": 0.903791964059171,
"lm_q2_score": 0.9136765257642905,
"openwebmath_perplexity": 280.94572593947305,
"openwebmath_score": 0.8809493184089661,
"tag... |
evolution
need to sample from a wide variety of valid phenotypes in the parameter space would run into serious problems.
The problem of the curse of dimensionality for optimal sampling can be intuitively explained in the following way: | {
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"openwebmath_score": null,
"tags": "evolution",
"url": null
} |
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