text stringlengths 1 1.11k | source dict |
|---|---|
python, python-3.x, file-system, posix
@property
def perms(self):
return ''.join(
name if self & val else '-'
for name, val in zip('rwx', PosixPermission)
)
>>> PosixPermission(0)
<PosixPermission.NONE: 0>
>>> PosixPermission(7)
<PosixPermission.READ|WRITE|EXECUTE: 7>
>>> P... | {
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"tags": "python, python-3.x, file-system, posix",
"url": null
} |
# Are differences between uniformly distributed numbers uniformly distributed?
We roll a 6-sided die a large number of times.
Calculating the difference (absolute value) between a roll and its preceding roll, are the differences expected to be uniformly distributed?
To illustrate with 10 rolls:
roll num result dif... | {
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"openwebmath_score": 0.7277336120605469,
"tag... |
textbook-and-exercises, linear-algebra
Title: How do I trace out the second qubit to find the reduced density operator? I'm doing an exercise to trace out the second qubit to find the reduced density operator for the first qubit:
$tr_2|11\rangle\langle00| = |1\rangle\langle0|\langle0|1\rangle$
I'm just wondering if I ... | {
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"tags": "textbook-and-exercises, linear-algebra",
"url": null
} |
quantum-field-theory, renormalization, topology, quantum-anomalies, chirality
$$
From the one side, this is bad defined quantity,
$$
J[\alpha] \simeq \text{exp}\left[i\alpha \lim_{x \to y}\text{Tr}(\gamma_{5})\delta (x - y)\right],
$$
so it requires the UV regularization. The explicit form of this regularization is ... | {
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"tags": "quantum-field-theory, renormalization, topology, quantum-anomalies, chirality",
... |
python, text-mining, semantic-similarity
Title: How to determine whether a semantic concept is present in a string I need to find a way to detect if a large string contains a specific substring.
Imagine that I have a full contract page converted to string in my Python program. What I want to do is to say if a specific... | {
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"tags": "python, text-mining, semantic-similarity",
"url": null
} |
python, python-3.x, game, console, tic-tac-toe
and then that could be futher simplified using the built-in function any, like this:
def check_for_win(board, player):
"""Returns True if player has won, otherwise False"""
player = format_player(player)
return any(all(board[pos] == player for pos in winning_l... | {
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"tags": "python, python-3.x, game, console, tic-tac-toe",
"url": null
} |
c++, performance, openmp, factors
for (i = 2; i <= integer; i++)
{
std::lldiv_t result = std::lldiv(integer, i); | {
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"tags": "c++, performance, openmp, factors",
"url": null
} |
sql, datetime, sql-server, oracle
If the results were of a dynamic length and we needed to remove the last three we would need to use len(x,-3):
left(convert(varchar(32),convert(smalldatetime,floor(cast(q.InTimeStart as float)*(24/.25))/(24/.25)),120),
len(convert(varchar(32),convert(smalldatetime,floor(cast(q.InTime... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "sql, datetime, sql-server, oracle",
"url": null
} |
php, html, email
Title: XHTML input for PHPmailer I have used PHPmailer to send email to users upon registering to the site. Now, everything works as should, however, I find myself doing painstaking work adding the HTML elements in.
Here's an example piece of HTML code:
<p>This is a paragraph</p>
<span>Now this is im... | {
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"tags": "php, html, email",
"url": null
} |
c, simulation
{
int btn_reg = IORD_ALTERA_AVALON_PIO_DATA(DE2_PIO_KEYS4_BASE);
if (btn_reg == 7) { //buttons_pressed() == -8){
gas_pedal = on;
cruise_control = off;
IOWR_ALTERA_AVALON_PIO_DATA(DE2_PIO_GREENLED9_BASE,LED_GREEN_6);
} else if (buttons_pressed() == -16) {
gas_pe... | {
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"tags": "c, simulation",
"url": null
} |
python, react.js, jsx, flask, socket.io
Some more notes:
Again, let me know if any glaring security holes exist in my code.
If flask_socketio isn't the best library for this, let me know.
Here's the github link for everything. I'm really excited to get some feedback on this. Also, if you have any tips on how to imp... | {
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"tags": "python, react.js, jsx, flask, socket.io",
"url": null
} |
pressure, vacuum
In fact, I found another question describing a similar scenario:
Why does pressure in a thermos increase after shaking up hot water and soap?
Which indicates the pressure should increase.
So in this case, why was the cap difficult to open? Does it change depending on how much air may be or may not be ... | {
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"tags": "pressure, vacuum",
"url": null
} |
c++, reinventing-the-wheel, tree, binary-search-tree
Can be rewritten to:
template<typename T, typename less_than>
template<bool IsConst>
auto BinaryTree<T, less_than>::iterator_base<IsConst>::operator*() -> value_type&
{
return static_cast<value_type &>(node->payload);
}
Note that the static_cast<>() wasn't even... | {
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"tags": "c++, reinventing-the-wheel, tree, binary-search-tree",
"url": null
} |
inorganic-chemistry, redox, aqueous-solution
First of all, I am interested as to why the heating aqueous solution of sucrose and hydrochloric acid result in the occurrence of foaming. Why does the sodium carbonate stop the process of foaming?
Second of all, I'd like to know why do we need to neutralize the solution in... | {
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"tags": "inorganic-chemistry, redox, aqueous-solution",
"url": null
} |
homework-and-exercises, newtonian-mechanics, classical-mechanics, spring
Title: What is the max compression of the spring? What are the velocities of the objects after the collision? and is the collision elastique? so there is an exercise where you need to find out what the maximum compression is of two blocks hitting... | {
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"url"... |
'' ( bounded by … parallelogram learnt about parallelogram, Squares, Rectangles, and square. Basic properties are common parallelogram examples Video Lesson with notes on how to determine the area of a parallelogram parallelogram... Are parallelogram examples circumference of a circle helpful in solving many mathematic... | {
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"lm_q2_score": 0.8459424295406088,
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"openwebmath_score": 0.4068468511104584,
"tags": null,
... |
general-relativity, momentum, conservation-laws
Edit: In the comments below MWT p457 has been cited to support the idea that energy and momentum are only conserved in specific cases. I am adding this to directly refute what has been said there.
MWT begin by saying that there is no such thing as energy or momentum for ... | {
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"tags": "general-relativity, momentum, conservation-laws",
"url": null
} |
rstudio, self-study, linear-models
Title: How to make a linear model with a constant value in R? I'm working on an unassessed homework problem from unpublished course notes of a statistics module from a second year university mathematics course.
I'm trying to plot a 2-parameter full linear model and a 1-parameter redu... | {
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"tags": "rstudio, self-study, linear-models",
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} |
programming-challenge, scala
I realize that a mutable collection is not a great starting point for functional Scala, but struggled to implement a memoized version of triangle without the mutable map. Your triangular number "cache" isn't an idiomatic technique in functional programming. Since triangular numbers consti... | {
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"tags": "programming-challenge, scala",
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} |
java, sql-server
public void setUsername(String username) {
this.username = username;
}
public Key getPasswordKey() {
return passwordKey;
}
public byte[] getEncryptedPassword() {
return encryptedPassword;
}
public void setPassword(String password) {
encryptedP... | {
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from x = 0 to x = r then double the answer to find the total volume. This is okay since all the sides are the same. 6× sum of adjacent tank diameters but not less than 3 ft (0. 𝑉= 𝜋 2 =𝜋 4. Vertical Stabilizer Class 1. Calculating the CBM. This means you need a method of calculating the liquid volume based on the li... | {
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"lm_q2_score": 0.8175744717487329,
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"openwebmath_score": 0.6385908722877502,
"tags... |
audio, audio-processing, highpass-filter
Similarly, a time domain integration which is $1/s$ in Laplace is a low pass filter. An accumulator $y[n] = x[n]+ y[n-1]$ is a discrete time approximation or mapping of a time domain integration, and we see here how a pole at the origin in s maps to $z=1$ in the z plane. | {
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homework-and-exercises, newtonian-mechanics, friction, spring
Title: Integrating Newton's second law for a box under the effect of return force from a spring and friction Let us imagine a box with mass $m$ connected to a spring with stiffness constant $k$. The box is displaced a distance $-d$ ($d$ being positive) from... | {
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"tags": "homework-and-exercises, newtonian-mechanics, friction, spring",
"url": null
} |
python, python-3.x, random, console
# Revised code: ok, there is a tuple of "splits" (not sure what that means,
# but it's the same size as CHARSETS, so I sort of see the connection). Oh,
# and then we just build the password from the characters coming out of
# choose_charset(). I sort of get it now.
splits = tuple(sp... | {
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particle-physics, experimental-physics, neutrons, elementary-particles
Title: What experiment(s) have or can refute the existence of an electron-particle "system" over the separate existence of a neutron within itself? This question actually came about from a discussion of another question posed here
The neutron is kn... | {
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"tags": "particle-physics, experimental-physics, neutrons, elementary-particles",
"url": ... |
solid-state-physics, integration
$$ \mathrm{d}k = \mathrm{d}\epsilon \frac{\mathrm{d}k}{\mathrm{d}\epsilon} $$
to get
$$ I = 4\pi \int_0^\infty \mathrm{d}\epsilon \frac{\mathrm{d}k}{\mathrm{d}\epsilon} k^2(\epsilon) F(\epsilon) $$
Matching to your next expression
$$ I \propto \int_{-\infty}^\infty \mathrm{d}\epsilon\ ... | {
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distinct elements that belong to both the sets. Every point on the dark line is a member of the set {x : x < 7orx≥11}. To understand, how to solve Venn diagram word problems with 3 circles, we have to know the following basic stuff. Register free for online tutoring session to clear your doubts. Let:- A ⋂ B = { x: x ∈ ... | {
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c, memory-management
aaIncValue looks clumsy. There is no need to single out the case of bucket->size == 0. What is important is whether the key is found or not, and bucket->size == 0 guarantees that the key is not found. So, consider
AssocArrayItem * item = aaFindItemInBucket(bucket, key);
if (item == NULL) {
... | {
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electromagnetism, electromagnetic-radiation
Am I missing something here?
**Edit: I used the term "Faraday Cage" because it is in common use and it makes this discussion easier for others to find. But I am asking about a highly idealized case of a superconducting spherical shell with a charge inside but not connected t... | {
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"tags": "electromagnetism, electromagnetic-radiation",
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} |
special-relativity, time, time-dilation
If I understand correctly, when she's not accelerating, Earth's clocks (and people) seem to move slower. It is only when she accelerates (when turning in the triangle) that Earth "abruptly" moves forward in her FoR. How abrupt is this, can she observe much of history continuousl... | {
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"tags": "special-relativity, time, time-dilation",
"url": null
} |
neural-network
"We stabilize the activations of Recurrent Neural Networks (RNNs) by penalizing
the squared distance between successive hidden states’ norms"
Googling "what is a norm Neural Net" doesn't provide any links A norm is a concept in linear algebra which assigns a size to a vector. Many different norms exi... | {
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"tags": "neural-network",
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discrete-signals, noise, statistics
Title: State of the art algorithms for estimating noise variance Suppose I have a signal $X[n]= f[n] + W[n]$, where $W$ is uncorrelated Gaussian white noise satisfying $E\{W[n]W[k]\} = \sigma^2 \delta[n-k]$.
What are the state-of-the-art algorithms for determining the noise variance... | {
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python, beginner
what happens if the file logins.txt does not exist?
what happens, if the username or password contains a :?
what happens if the password contains the username? Compare this in the your original version and the version we have now. Did we accidentally fix a bug while changing the code? | {
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botany, microbiology, sterilisation
capping them with foil – allowing for air to escape without being
subjected to contaminants.
The process involves boiling fluids for 10-15 minutes before leaving to cool to room temperature and leaving it to sit for 24
hours. Repeat this process another three or four times, by w... | {
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The comparison of the lengths can be worked out in the similar fashion.
Eventually, we have $\dfrac {perimeter(polygon)}{perimeter(circle)} = \dfrac {\tan \theta}{\theta}$.
Result follows.
Remark:-
As pointed out by @expiTTp1z0, this only works for the case when the "central angle" is constantly equal to $2 \theta$... | {
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"tags... |
quantum-gate, quantum-state
Title: How to input 2 qubits in 2 Hadamard gates? Let's say we have a circuit with $2$ Hadamard gates:
Let's take the $|00\rangle$ state as input. The vector representation of $|00\rangle$ state is $[1 \ 0 \ 0 \ 0]$, but this is the representation of $2$ qubits and H accepts just $1$ qubit... | {
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rospy, ros-hydro, ubuntu-precise, ubuntu
without issue. However, when I now to try to test out the package with
rosrun nmea_navsat_driver nmea_serial_driver _port:=/dev/ttyUSB0 _baud:=38400
I get the error
[rospack] Error: stack/package nmea_navsat_driver not found
no matter where I am in the file tree. This makes... | {
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"id": 19040,
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"openwebmath_score": null,
"tags": "rospy, ros-hydro, ubuntu-precise, ubuntu",
"url": null
} |
machine-learning
Title: Processing train and test data I have X numpy array as my features and y numpy array as my target. I split both of it into train and test data. From many QnA i have read they only say to preprocess both train and test separately. I assume i only do it to my feature (X) train and test data and n... | {
"domain": "datascience.stackexchange",
"id": 7131,
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"tags": "machine-learning",
"url": null
} |
split the above interval as parts and each part will be considered as range which depends upon the given inverse trigonometric function. Use the valid input values to determine the range of the output values. GRAPHICAL A. We can also use inequalities, or other statements that might define sets of values or data, to des... | {
"domain": "klimaflo.com",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.97241471777321,
"lm_q1q2_score": 0.8103370991512161,
"lm_q2_score": 0.8333245932423308,
"openwebmath_perplexity": 441.8075650371521,
"openwebmath_score": 0.8654718995094299,
"tags":... |
rust, rational-numbers
}
/// Returns a new Fraction equal to this Fraction plus another
pub fn add<'a>(&self, other: &'a Fraction) -> Fraction {
Fraction { numerator: (self.numerator * other.denominator + other.numerator * self.denominator), denominator: (self.denominator * other.denominator) }
}
... | {
"domain": "codereview.stackexchange",
"id": 25960,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "rust, rational-numbers",
"url": null
} |
ros2
Any help is appreciated!
Thank you.
Originally posted by Cryoschrome on ROS Answers with karma: 75 on 2022-05-30
Post score: 0
Original comments
Comment by AndyZe on 2022-05-31:
I don't know, but you might try a MultiThreadedExecutor instead of SingleThreadedExecutor
Comment by Cryoschrome on 2022-06-01:
Thanks... | {
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"tags": "ros2",
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} |
mind. algorithms of linear algebra called Gauss–Jordan elimination. While anyone reading this book has. Before proceeding you many want to review the sections on Data Types and Operators. Zabadi, and RamizAssaf 28 Where, t is a parameter. Early Life. To add (or subtract) two matrices of the same dimensions, we add (or ... | {
"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,
... |
particle-physics, beyond-the-standard-model
can produce a
charmed omega baryon (charm-strange-strange / second generation neutron /muotron) and a muon neutrino.
more simply: puotron + muon =? muotron + muon neutrino
Thanks in advance for any feedback! The proton and the neutron behave like two isospin projections of... | {
"domain": "physics.stackexchange",
"id": 83816,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "particle-physics, beyond-the-standard-model",
"url": null
} |
localization, ekf, odometry, path, kalman
Long story short: make sure your twist message is reported in the base_link (body) frame. See REP-105 for information about coordinate frames in ROS. Then change the frame_id in the header to base_link and try again. | {
"domain": "robotics.stackexchange",
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"lm_q2_score": null,
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"tags": "localization, ekf, odometry, path, kalman",
"url": null
} |
php, optimization, php5, pdo
$password = $bcrypt->genHash($password);// generating a hash using the $bcrypt object
I'd remove it. (Clean Code by Robert C. Martin: Chapter 4: Comments, Noise Comments)
A lot of parameters is a code smell: Long Parameter List. Their type are the same, it's easy to mix them up. Consid... | {
"domain": "codereview.stackexchange",
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"tags": "php, optimization, php5, pdo",
"url": null
} |
algorithms, runtime-analysis, primes
We can estimate the number of multiplications by
$$
\sum_{\text{prime } q \leq B} \frac{\log B}{\log q} \cdot \log q < \pi(B) \log B = O(B).
$$
This improves slightly on the Wikipedia estimate of $O(B\log B)$.
The school multiplication algorithm takes time $O(\log^2 n)$, which is h... | {
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"id": 12592,
"lm_label": null,
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "algorithms, runtime-analysis, primes",
"url": null
} |
organic-chemistry, reaction-mechanism, carbonyl-compounds, aldol-reaction
Source: Organic Chemistry, 2 ed., Warren, Clayden, Wothers & Greeves
The newly formed enolate may then attack an un-enolised molecule of the aldehyde (this is okay, since we've established that the aldehyde and the enolate are in equilibrium un... | {
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"tags": "organic-chemistry, reaction-mechanism, carbonyl-compounds, aldol-reaction",
"ur... |
students 2 (Jun 2013-Apr 2014) smartphones) from the outset due to the need to cater for many complex algorithm visualizations that require lots of pixels and click-and-drag gestures for interaction. Answer. On the first line there will be two integers N - the number of nodes and M - the number of edges. It is a greedy... | {
"domain": "initiatives.tv",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9632305349799242,
"lm_q1q2_score": 0.8068211273436142,
"lm_q2_score": 0.8376199653600372,
"openwebmath_perplexity": 1066.3803125301752,
"openwebmath_score": 0.46429336071014404,
"tags... |
reinforcement-learning, q-learning, dqn, deep-rl, exploration-exploitation-tradeoff
In addition, you should be normalising the input into range $[0,1]$ or $[-1,1]$. The native image range $[0,255]$ is tricky for neural networks to process, and quite common for value functions to get stuck if you don't normalise. | {
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "reinforcement-learning, q-learning, dqn, deep-rl, exploration-exploitation-tradeoff",
... |
organic-chemistry, molecular-structure, chirality
If two identical substituents are attached to a sp3-hybridized atom, the descriptors pro-R and pro-S are used to distinguish between the two.
But H atoms are not considered substituents in organic chemistry, see substituent . I consider the concept of prochirality as ... | {
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"tags": "organic-chemistry, molecular-structure, chirality",
"url": null
} |
python, python-3.x, interval
def __str__(self):
return self.__repr__()
def __repr__(self):
ext = ""
if not self.step == 1:
ext += ", {0}".format(self.step)
if self.precision != self._precision:
ext += ", precision={0}, tolerance={1}".format(
... | {
"domain": "codereview.stackexchange",
"id": 33253,
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"tags": "python, python-3.x, interval",
"url": null
} |
If you are working in some number system that includes infinitesimals, you should say that. There is no indication in the question that you are, and all the answers to this and your other question are in the real numbers. I know very little about such systems. You seem to have an intuitive sense of how you want the inf... | {
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"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9873750518329434,
"lm_q1q2_score": 0.8524913391206932,
"lm_q2_score": 0.8633916134888614,
"openwebmath_perplexity": 299.17141347939116,
"openwebmath_score": 0.9525929093360901,
"ta... |
for the sum of the natural numbers is a quadratic, of the form an 2 +bn+c. The sum of the first n odd natural numbers is (2k-1 represents any odd number): [6. The ∑ symbol represents the "summation function. This is a substitution of the form for a constant. There are formulae that can allow us to calculate the sum. ∑a... | {
"domain": "quellidelparco.it",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9814534316905263,
"lm_q1q2_score": 0.8220849795093139,
"lm_q2_score": 0.8376199552262967,
"openwebmath_perplexity": 566.7485815866885,
"openwebmath_score": 0.874673068523407,
"... |
quantum-algorithms, complexity-theory
Title: Accessing parameter in oracle and their relation I am actually a newbie in quantum computing. I do have some doubts regarding quantum query complexity.
From what I understood is that we can't explicitly give the input and use oracle for this purpose. Let's say $O_x|i,b\rang... | {
"domain": "quantumcomputing.stackexchange",
"id": 2826,
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I believe that I misunderstood the question in my first answer. What I think you want is a way to compute $$\int_0^\infty\frac{\log(x)}{1+x^2}\mathrm{d}x$$ without using complex analysis.
With the substitution $x\mapsto\frac1x$, we get $$\int_0^\infty\frac{\log(x)}{1+x^2}\mathrm{d}x=-\int_0^\infty\frac{\log(x)}{1+x^2}... | {
"domain": "stackexchange.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9719924761487654,
"lm_q1q2_score": 0.8099852348212758,
"lm_q2_score": 0.8333245932423308,
"openwebmath_perplexity": 524.5748926458967,
"openwebmath_score": 0.9658475518226624,
"tag... |
catkin, cmake, osx
I skip this error and I tried to build src files by using:
./src/catkin/bin/catkin_make_isolated --install -DCMAKE_BUILD_TYPE=Release
The problem is: First 8 packaged built completely but 9. package ( class_loader ) produce error:
-- catkin 0.6.11
CMake Error at CMakeLists.txt:6 (find_package):
... | {
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} |
quantum-mechanics, commutator, second-quantization
$$
Perhaps this is an obvious result however I do not see through explicitly evaluating the commutation relation how you obtain this.
Hamiltonian and information in this text comes from the paper 'Many-body theory of the optical conductivity of excitons and trions in ... | {
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"tags": "quantum-mechanics, commutator, second-quantization",
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c#, .net, rubberduck, wrapper, com
public VBE VBE
{
get
{
ThrowIfDisposed();
return new VBE(InvokeMemberValue(() => Item.VBE));
}
}
So I'll be making it the calling code's responsibility to ensure Dispose gets called for every IDisposable wrapper involved - and... | {
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"openwebmath_score": null,
"tags": "c#, .net, rubberduck, wrapper, com",
"url": null
} |
temperature, brown-dwarf
The object talked about in the article is not in a close binary, so it's mass cannot be measured, it can only be estimated indirectly. But here come the difficulties. To estimate the mass requires accurate calculations of the evolutionary tracks of brown dwarfs. The measurements of brown dwarf... | {
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"id": 3085,
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"tags": "temperature, brown-dwarf",
"url": null
} |
c++, reinventing-the-wheel, c++20
BOOST_AUTO_TEST_CASE(make_any_test) {
Any a1 = makeAny<int>(7);
Any a2 = makeAny<A>(30, "Ada", 1000.25);
a1.swap(a2);
BOOST_CHECK_EQUAL(AnyCast<int>(a2), 7);
BOOST_CHECK_EQUAL(AnyCast<A>(a1).age, 30);
BOOST_CHECK_EQUAL(AnyCast<A>(a1).name, "Ada");
BOOST_... | {
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"tags": "c++, reinventing-the-wheel, c++20",
"url": null
} |
For completeness, suppose that $$p=0$$ or $$p=1$$ and that the walk starts at $$\sigma \in S$$. It is clear that if $$p=0$$ then after $$\ell(\sigma)$$ steps the walk reaches the identity permutation; if $$p = 1$$ then after $$\binom{n}{2} - \ell(\sigma)$$ steps the walk reaches the order reversing permutation $$1 \map... | {
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"lm_q1_score": 0.9857180664944448,
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"lm_q2_score": 0.8577681068080748,
"openwebmath_perplexity": 985.9429299700173,
"openwebmath_score": 0.9995585083961487,
"tags... |
of the circle. 3. The Area of a Segment is the area of a sector minus the triangular piece (shown in light blue here). Learn vocabulary, terms, and more with flashcards, games, and other study tools. A higher airspeed causes the aircraft to travel through a longer arc due to a greater speed. S. Central Angle of a Circl... | {
"domain": "brian229.com",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9867771759145343,
"lm_q1q2_score": 0.8244360832449217,
"lm_q2_score": 0.8354835350552604,
"openwebmath_perplexity": 296.86371070752983,
"openwebmath_score": 0.9140522480010986,
"tag... |
#include <stdio.h>
#include <stdlib.h>
#include <malloc.h>
#define bool _Bool
static unsigned long prime_limit = 1000000;
unsigned long sqrtld(unsigned long N) {
int b = 1;
unsigned long res,s;
while(1<<b<N) b+= 1;
res = 1<<(b/2 + 1);
for(;;) {
s = (N/res + res)/2;
if(s>=r... | {
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"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9907319868927341,
"lm_q1q2_score": 0.8553896904395946,
"lm_q2_score": 0.8633916152464016,
"openwebmath_perplexity": 1756.1766796464285,
"openwebmath_score": 0.8579844236373901,
"tags"... |
rosmake
Please help..
Thanks,
Sai
Originally posted by sai on ROS Answers with karma: 1935 on 2012-08-02
Post score: 0
Did you remove the erroneous depends tag you added here:
http://answers.ros.org/question/40456/cannot-find-rosh/
Originally posted by dornhege with karma: 31395 on 2012-08-03
This answer was ACCEPT... | {
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"openwebmath_score": null,
"tags": "rosmake",
"url": null
} |
quantum-mechanics, homework-and-exercises, hilbert-space, angular-momentum, wigner-eckart
By Wigner-Eckart Theorem
Using $\langle j_1\, m_1 ;j_2\, m_2|J\,M\rangle$ to denote the Clebsch-Gordan coefficients, the Wigner-Eckart Theorem states that:
$$\langle j\, m|\, T_q^{(k)}|j'\,m'\rangle\;=\;\langle j'\,m';k\,q|j\, m\... | {
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"tags": "quantum-mechanics, homework-and-exercises, hilbert-space, angular-momentum, wigner... |
ros, controller-manager, ros-indigo
Comment by maztentropy on 2015-09-03:
I used the serial number obtained from "list_devices" (which I think is already hex). I have anyway tried different ways of inputting the number and none of them worked. The ROS_INFO message which parses the device you're connecting to kept sayi... | {
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"tags": "ros, controller-manager, ros-indigo",
"url": null
} |
gauge-theory, gauge
Note that we did not impose a gauge of any kind here. The same idea of "physical state condition" can be seen in the BRST formalism, which, if you don't insist on writing it as a path integral formulation, also doesn't need to choose a gauge condition generically.
The reason you often see a quantiz... | {
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"openwebmath_score": null,
"tags": "gauge-theory, gauge",
"url": null
} |
thermodynamics, physical-chemistry
Title: Specific Heat, Conservation of Energy, and Kinetic Energy Different molecules have different specific heats, such as water, which has a very high specific heat due to strength of inter-molecular attractions.
If temperature is the random kinetic energy of individual molecules/... | {
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"id": 55882,
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"openwebmath_score": null,
"tags": "thermodynamics, physical-chemistry",
"url": null
} |
machine-learning, data-mining, classification, statistics, predictive-modeling
public int getSumFreq(){
return event.size();
}
public int getUniqueCount(){
return event.entrySet().size();
}
public String[] getKeys(){
Set<String> test = event2.keySet();
Object[] keys = test.toArray();
String[] key... | {
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"id": 538,
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"openwebmath_score": null,
"tags": "machine-learning, data-mining, classification, statistics, predictive-modeling",... |
thermodynamics, fluid-dynamics, condensed-matter, pressure, temperature
At temperatures above the critical temperature at 33K, there is no phase transition from vapor to liquid. The phase diagram below
(source)
is a little annoying to read because you have to do the log scales yourself. Room temperature is $\log_{10}... | {
"domain": "physics.stackexchange",
"id": 99092,
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"tags": "thermodynamics, fluid-dynamics, condensed-matter, pressure, temperature",
"url":... |
recursion, vba, windows, vb6
Dim reg As Registry
There's no reason not to New up this instance right away:
Dim reg As New Registry
That saves 1 line and a comment!
For i = 1 To iSectCount
Since the class doesn't specify Option Base 1 anywhere in the (declarations) section (just looked at the Google Drive link), it... | {
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"openwebmath_score": null,
"tags": "recursion, vba, windows, vb6",
"url": null
} |
floating-point, number-formats, normal-forms
So your normalized result ($1.1 \times 2^{-2}$) is correct, and it is correct because you've moved the first 1 to the left of the binary point. | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "floating-point, number-formats, normal-forms",
"url": null
} |
python, object-oriented
with open("{}{}".format(self.path, "list_of_all_filenames"), "r") as listall:
self.list_of_all_filenames = json.load(listall)
self.openAllFilesInPath(self.path)
self.base_bg_image = tk.PhotoImage(file="./Colors/pybgbase.png")
self.bgLable = tk.Label(self.roo... | {
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"id": 25983,
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"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python, object-oriented",
"url": null
} |
python, compression
stack.append(temp_string)
The temporary variables are temp_string, temp_string_2, temp_index and temp_position. I know I should not be using names like these, but I didn't know what else to name it. This code just doesn't feel clean, and I don't know if it's just me, but it's not pleasant to look ... | {
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"id": 18678,
"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": "python, compression",
"url": null
} |
machine-learning, recommender-system
Title: Field Aware Factorization Machines Can anyone explain how field-aware factorization machines (FFM) compare to standard Factorization Machines (FM)?
Standard:
http://www.ismll.uni-hildesheim.de/pub/pdfs/Rendle2010FM.pdf
"Field Aware":
http://www.csie.ntu.edu.tw/~r01922136/kag... | {
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "machine-learning, recommender-system",
"url": null
} |
particle-physics, data
Title: Understanding the 2007 PDG-Review on Constants I have a question concerning the following table:
http://pdg.lbl.gov/2007/reviews/consrpp.pdf
Let's take the Weinberg-mixing angle as an example, whose sine-squared is stated as $$\sin^2 \theta_W = 0.231 22(15).$$ Now, I have difficulties in... | {
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"tags": "particle-physics, data",
"url": null
} |
Alternatively, you can specify some common colors by name. This table lists the named color options, the equivalent RGB triplets, and hexadecimal color codes.
Color NameShort NameRGB TripletHexadecimal Color CodeAppearance
'red''r'[1 0 0]'#FF0000'
'green''g'[0 1 0]'#00FF00'
'blue''b'[0 0 1]'#0000FF'
'cyan' 'c'[0 1 ... | {
"domain": "mathworks.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9852713852853137,
"lm_q1q2_score": 0.8612032770255403,
"lm_q2_score": 0.8740772236840656,
"openwebmath_perplexity": 4498.974919876233,
"openwebmath_score": 0.5654040575027466,
"tags": ... |
machine-learning, nlp, pytorch, transformer
That's the thing. It isn't flattened into a single vector. The linear
transformation is applied to all M vectors in the sequence
individually. These vectors have a fixed dimension, which is why it
works.
But how do we coalesce those transformed vectors into just one single ... | {
"domain": "datascience.stackexchange",
"id": 9789,
"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": "machine-learning, nlp, pytorch, transformer",
"url": null
} |
organic-chemistry, terminology, proteins
Further on in the text, hydroxytryptophan is called "the mono-oxidized form" (моноокисленная форма) and dihydroxytryptophan is called "the dioxidized form" (диокисленная форма). Is this correct and would this be understood by the readers if I translate it as-is? First, you can... | {
"domain": "chemistry.stackexchange",
"id": 8794,
"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": "organic-chemistry, terminology, proteins",
"url": null
} |
inorganic-chemistry, everyday-chemistry, electrochemistry, metal
Title: Galvanic corrosion between nickel brass nut and stainless bolt I am planning to install something on a boat that will be in salt water, and my question is, will the nickel plated brass fastener not corrode if I connect it to stainless steel?
I loo... | {
"domain": "chemistry.stackexchange",
"id": 193,
"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": "inorganic-chemistry, everyday-chemistry, electrochemistry, metal",
"url": null
} |
java, object-oriented, design-patterns, socket, stream
public class ProducerConsumerService implements Executor {
private static final Logger log = Logger.getLogger(ProducerConsumerService.class.getName());
private final BlockingQueue<Title> queue = new ArrayBlockingQueue<>(1);
private Producer producer =... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "java, object-oriented, design-patterns, socket, stream",
"url": null
} |
orbit, earth, climate
This distance-temperature inconsistency isn't unique to the Earth. Look at the average temperature of the other inner planets as we move away from the sun: | {
"domain": "astronomy.stackexchange",
"id": 471,
"lm_label": null,
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "orbit, earth, climate",
"url": null
} |
kinect, rviz, turtlebot
Title: How to Properly Orient Kinect Data from Turtlebot in RVIZ?
This has been bugging me for a while now, and it's starting to make things quite difficult.
The point cloud data (and, if I remember correctly, stuff like odometry data) from the Turtlebot come in with 'depth' oriented along the... | {
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"id": 7854,
"lm_label": null,
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"openwebmath_score": null,
"tags": "kinect, rviz, turtlebot",
"url": null
} |
deep-learning, deepfakes
Attacks on integrity of public figures, backed by realistic-looking "evidence". Even with the knowledge that this fakery is possible (and perhaps likely given a particular context), then damage can still be done especially towards feeding people with already-polarised opinions with manufacture... | {
"domain": "ai.stackexchange",
"id": 2069,
"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": "deep-learning, deepfakes",
"url": null
} |
javascript, beginner, html
function create_menu(div_id, sel_id, menu_options) {
var myDiv = document.getElementById(div_id);
// wipe what's already in the div we're putting this menu
myDiv.innerHTML = "";
// create select menu and size
var selectList = doc... | {
"domain": "codereview.stackexchange",
"id": 17736,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "javascript, beginner, html",
"url": null
} |
product. Note that for matrices (and vectors are just rank 1 matrices, so this still holds) $$\frac{{\partial \underline {\overline {\bf{Y}} } }}{{\partial \underline {\overline {\bf{X}} } }} = \frac{{\partial \,{\rm{vec}}\left( {\underline {\overline {\bf{Y}} } } \right)}}{{\partial \,{\rm{vec}}\left( {\underline {\ov... | {
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"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9877587272306606,
"lm_q1q2_score": 0.8121244805000625,
"lm_q2_score": 0.822189121808099,
"openwebmath_perplexity": 243.43376393710113,
"openwebmath_score": 0.8649083375930786,
"tag... |
ros, stack
ros-electric-nodelet-core ros-electric-openni-kinect
ros-electric-orocos-kinematics-dynamics ros-electric-perception-pcl
ros-electric-pluginlib ros-electric-robot-model
ros-electric-robot-model-visualization ros-electric-ros
ros-electric-ros-comm ros-electric-rx ros-electric-slam-gmapping
ros-elec... | {
"domain": "robotics.stackexchange",
"id": 10012,
"lm_label": null,
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"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "ros, stack",
"url": null
} |
optics, energy
Title: Why is the receiver of this solar tower cream-colored? I wonder, why the receiver of this solar tower is not black? Wouldn't a black receiver be more efficient? If not, why is it not white then, but is an intermediate color?
It seems that the receiver of other solar towers, such as Solar One is ... | {
"domain": "physics.stackexchange",
"id": 9496,
"lm_label": null,
"lm_name": null,
"lm_q1_score": null,
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "optics, energy",
"url": null
} |
simulation, rosbag, transform
tf::tfMessage tfmsg;
//convert the tf::transform (variable tr) to a geometry msg
tf::transformStampedTFToMsg(tf::StampedTransform(tr, ros::Ti me::now(), "/world","/tf_vehicle"),msg);
//erase all value from the std::vector
vec_msg.erase(vec_msg.begin(),vec_msg.end());
//push back into t... | {
"domain": "robotics.stackexchange",
"id": 7260,
"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": "simulation, rosbag, transform",
"url": null
} |
electromagnetism, magnetic-fields, earth, geomagnetism
I realize other discussions on this site have claimed (using math etc) that the energy is so minimal it isn't worth the effort, but that's not my question.
I've seen the evidence for the device on the Internet in the past, and I wish to examine the evidence of the... | {
"domain": "physics.stackexchange",
"id": 11619,
"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": "electromagnetism, magnetic-fields, earth, geomagnetism",
"url": null
} |
logging, erlang
if erlang:is_list(Value) ->
State#logger_state{file_path=Value};
true->
State
end;
output_level->
if erlang:is_integer(Value) ->
State#logger_state{output_... | {
"domain": "codereview.stackexchange",
"id": 23646,
"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": "logging, erlang",
"url": null
} |
diffusion, chaos-theory
The typical example for anomalous diffusion are systems whose behavior alternates between jumps/bursts and relatively well-behaved regimes.
A prototypical case is indeed intermittency (see this introduction), but also prominent are chaotic Hamiltonian systems which are not fully chaotic, i.e., ... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "diffusion, chaos-theory",
"url": null
} |
catkin, ros-hydro, ubuntu, ubuntu-precise, linking
install(DIRECTORY include/${PROJECT_NAME}/
DESTINATION ${CATKIN_PACKAGE_INCLUDE_DESTINATION}
FILES_MATCHING PATTERN "*.h"
PATTERN ".svn" EXCLUDE
)
And if i run dpkg -L libserial0
I do get the following:
/.
/usr
/usr/share
/usr/share/doc
/usr/share/doc/libse... | {
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"tags": "catkin, ros-hydro, ubuntu, ubuntu-precise, linking",
"url": null
} |
What you have is a nice, direct proof. I would only get rid of the absolute values, so that it becomes more obvious how each term is estimated.
So for $$x \in (k, k+1)$$ with an integer $$k$$, $$0 \le k \le n$$, we have $$|(1-x)(2-x)(3-x)\cdots(n-x)| \\ = (x-1)(x-2)\cdots(x-k) \, \times \, (k+1-x)(k+2-x) \cdots (n-x) ... | {
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"id": null,
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9763105300791785,
"lm_q1q2_score": 0.8071274340601694,
"lm_q2_score": 0.8267117983401363,
"openwebmath_perplexity": 340.0595406591969,
"openwebmath_score": 0.99830561876297,
"tags"... |
that 's the symmetric matrix are, or can be are eigenvectors always orthogonal be! The family are eigenvectors always orthogonal real, imaginary, and e 2 this one, the orthogonal matrix eigenfunctions orthogonal. Every 3 by 3 orthogonal matrix has always 1 as an eigenvalue covariance matrix symmetric... Though not ever... | {
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"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9822877044076955,
"lm_q1q2_score": 0.8206852117674522,
"lm_q2_score": 0.8354835432479661,
"openwebmath_perplexity": 630.5071021837142,
"openwebmath_score": 0.8961015939712524,
"tag... |
cosmology, terminology, universe, galaxies, structure-formation
Title: In large scale cosmological structure, are filaments, walls, sheets and nodes different terms for the same things? As the question says - are these all essentially synonyms referring to the same phenomenon (described with different words depending ... | {
"domain": "physics.stackexchange",
"id": 36061,
"lm_label": null,
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"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "cosmology, terminology, universe, galaxies, structure-formation",
"url": null
} |
mechanical-engineering, thermodynamics
The temperature behavior in throttling process is governed by the Joule-Thomson coefficient $\mu$
$$\mu = \left ( \frac{\partial T}{\partial P} \right )_h $$
The Joule-Thomson coefficient is a measure of the change in temperature at constant-enthalpy process, if it equals zero th... | {
"domain": "engineering.stackexchange",
"id": 358,
"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": "mechanical-engineering, thermodynamics",
"url": null
} |
2. ### Math
A bag contains 9 red marbles, 8 white marbles, and 6 blue marbles. You draw 4 marbles out at random, without replacement. What is the probability that all the marbles are red? 1 The probability that all the marbles are red is...?
3. ### Jar Marbles
A jar contains 5 red marbles, numbered 1 to 5, and 12 bl... | {
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"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9811668734137681,
"lm_q1q2_score": 0.804452178772081,
"lm_q2_score": 0.8198933337131076,
"openwebmath_perplexity": 279.25923584468103,
"openwebmath_score": 0.8649135828018188,
"tags": nul... |
homework-and-exercises, newtonian-mechanics, friction, work
It is easy to see that $a=\mu_{k}g,\alpha=-2\mu_{k}g/R,t=\frac{R\omega_{0}}{3\mu_{k}g},d = \frac{1}{2}at^2
$ are acceleration, angular acceleration, time from beginning to the time of rolling w/o slipping and distance covered. I am somehow missing why I am g... | {
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"openwebmath_score": null,
"tags": "homework-and-exercises, newtonian-mechanics, friction, work",
"url": null
} |
classical-mechanics, rotational-dynamics, moment-of-inertia
You are inadvertently asking me to write a lot. Go to scholar.google.com and books.google.com and search for "slosh dynamics" and you'll see how much has been written on understanding and mitigating slosh. I'll instead provide an overview.
Most slosh models a... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "classical-mechanics, rotational-dynamics, moment-of-inertia",
"url": null
} |
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