text stringlengths 1 1.11k | source dict |
|---|---|
organic-chemistry, reaction-mechanism, terminology
Title: What is an ambident substrate? I had to identify whether a few compounds are ambident substrates or not.
However, as I did not know the term, I took to googling it, but I could not find any explanation for this group anywhere.
I know about ambident nucleophiles... | {
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"tags": "organic-chemistry, reaction-mechanism, terminology",
"url": null
} |
newtonian-mechanics, kinematics
Regarding the second part of your question: generally, if the value of acceleration isn't constant (in fact if it's not equal to zero), the velocity also changes.
If we consider vectors of acceleration and velocity, they don't have to be collinear at all (as witnessed by circular or gen... | {
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"tags": "newtonian-mechanics, kinematics",
"url": null
} |
java, algorithm, traveling-salesman
private static final class Pair<F, S> {
F first;
S second;
Pair(F first, S second) {
this.first = first;
this.second = second;
}
}
private static final int MINIMUM_GRAPH_SIZE = 3;
@Override
pu... | {
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"openwebmath_score": null,
"tags": "java, algorithm, traveling-salesman",
"url": null
} |
ros, laser-assembler, ros-hydro
Comment by Javier V. Gómez on 2013-12-09:
There is something I'm not understanding at all. If I publish scans and also tf, laser_assembler will transform the laser scans, yes or no? If yes, how to specify with tf? Since, as I say, tf is a tree of frames and transformations (but this is ... | {
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"tags": "ros, laser-assembler, ros-hydro",
"url": null
} |
c#, database, error-handling, wrapper
Plus, a database can handle auto-increments much better than you ever will, even more so when it comes to concurrent writes.
Last but not least, exceptions. Don't throw NullReferenceExceptions. That's the job of CLR, not yours. Now, with my design the need to throw it just goes aw... | {
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"url": null
} |
From there the proof is completed by putting everything side by side, showing that $k + 1$ is less than all those intermediate steps, resulting in it also being less than $2^{k + 1}$, which makes sense, had I understood that last step!
Yes there are a number of questions similar to this one - couldn't quite find one f... | {
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"openwebmath_perplexity": 185.50539920300642,
"openwebmath_score": 0.9197381138801575,
"tag... |
c#, entity-framework, oracle, lambda
Title: Refactor Oracle Entity Framework lambda query I had a ugly problem and wrote an ugly query.
Query creates a cache that is used to get person id when I have {full_name, id_code?, birth_date?}. By question mark I mean that it is perfectly valid for person not to have {id_code... | {
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"tags": "c#, entity-framework, oracle, lambda",
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everyday-chemistry, aqueous-solution, solutions, concentration, water-treatment
Late Edit:
This is about comment made by OP on my post. In that comment, OP states that the cost for dichloro-s-triazinetrione dihydrate (Di-Chlor) and beach are almost same. But I do not agree with that. Just for curiosity, I checked the ... | {
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"tags": "everyday-chemistry, aqueous-solution, solutions, concentration, water-treatment"... |
java, swing, simulation, gui, awt
wnd.active(true);
activeWindow = wnd;
}
public void move(final int x, final int y) {
MyWindow target = null;
for (int i = wndList.size() - 1; i >= 0; --i) {
if (wndList.get(i).windowContainsPoint(x, y)) {
target = wndList.g... | {
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"tags": "java, swing, simulation, gui, awt",
"url": null
} |
What about AM-GM?
$$(1-x)^n(1+nx) = \text{GM}(1-x,1-x,\ldots,1-x,1+nx)^{n+1} \color{red}{\leq} \text{AM}(1-x,1-x,\ldots,1-x,1+nx)^{n+1}=1$$ and the inequality holds tight since $(1-x)\neq(1+nx)$. Done.
• Lovely proof! Can this be used for the standard Bernoulli inequality as well? – πr8 Dec 31 '16 at 13:10
• @πr8: ye... | {
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"ta... |
• @ArnaldoNascimento could you please clarify what you meant by 'your new set will be inside S'? Nov 30, 2016 at 15:05
• Note that if $k \in \mathbb{Z}, \ \mbox{with}\ k \neq 0,1,2,3$ or $4$ then $k = 5\cdot n + r$ with $r=0,1,2,3\ \mbox{or}\ 4, n \in \mathbb{Z}$. In this case this does not matter because $sin (\frac{1... | {
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"openwebmath_score": 0.8072888255119324,
"tags... |
linear-programming, randomized-algorithms, online-algorithms, matching, primal-dual
Title: Is it enough for linear program constraints to be satisfied in expectation? In the paper Randomized Primal-Dual analysis of RANKING for Online Bipartite Matching, while proving that the RANKING algorithm is $\left(1 - \frac{1}{e... | {
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"tags": "linear-programming, randomized-algorithms, online-algorithms, matching, primal-dua... |
rosnode
Originally posted by huanxiner with karma: 271 on 2016-11-04
This answer was ACCEPTED on the original site
Post score: 1
Original comments
Comment by gvdhoorn on 2016-11-05:
Alternatively, you could use the Master API directly.
Comment by Falko on 2016-11-07:
Great, thanks! Apparently, you can even get the ma... | {
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"tags": "rosnode",
"url": null
} |
cc.complexity-theory, complexity-classes, time-complexity, sat, boolean-matrix
In his explanation of his method in the comments, he mentioned that by the construction of the matrix, one is forced to pick only 1 of the $x_i, \neg x_i$ columns for all $i \in [1,m]$, i.e. forcing an assignment to the CNF (I believe due t... | {
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"tags": "cc.complexity-theory, complexity-classes, time-complexity, sat, boolean-matrix",
... |
python, python-3.x, object-oriented
# Test for inherited funcs
# [getattr(complex, a) == getattr(super(complex), a, None) for a,o in complex.__dict__.items()]
default_exclude = {"__new__", "__getattribute__", "__getattr__", "__setatt__"}
class TypeEnforcerMetaclass(type):
"""
Black magic return type wrapper.... | {
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"tags": "python, python-3.x, object-oriented",
"url": null
} |
I understand all of the steps except one: how are we over counting? P(3,3) = 6 which implies that the ordering of the cards in the hand matters, which makes no sense to me because it's still the same hand regardless of what order it's in. So how are we over counting, where is 3!=6 coming from if not P(3,3).
Thanks!
O... | {
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"openwebmath_score": 0.538092315196991,
"tags"... |
We first create two tensors:
data = bm.array([1, 2])
data
JaxArray(DeviceArray([1, 2], dtype=int32))
ones = bm.ones(2)
ones
JaxArray(DeviceArray([1., 1.], dtype=float32))
data + ones
JaxArray(DeviceArray([2., 3.], dtype=float32))
data - ones
JaxArray(DeviceArray([0., 1.], dtype=float32))
data * data
JaxAr... | {
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"lm_q2_score": 0.8198933425148214,
"openwebmath_perplexity": 5042.462246689959,
"openwebmath_score": 0.3701919913291931,
"tags": ... |
called a linear equation, can be written as: y = mx + b, where m is the slope of the line and b is the y-intercept. 1 OBJECTIVES 1. Point − SlopeFormula: y − y1 = m(x − x1) Example 2. Graphing Linear Functions Worksheet Answers Best Of Slope Intercept Equation From Slope & Point Video, picture size 346x445 posted by at... | {
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"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.992422759404464,
"lm_q1q2_score": 0.8136808112121532,
"lm_q2_score": 0.819893340314393,
"openwebmath_perplexity": 326.4255176426403,
"openwebmath_score": 0.64701247215271,
"tag... |
cosmology, stellar-physics
It may seem counterintuitive that reflecting radiation back into the sun will cool it off enough to stop the fusion reaction. Remember, however, that a star as a gravitating object has negative heat capacity, its core is hot because there are temperature gradients in outer regions, so by ret... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "cosmology, stellar-physics",
"url": null
} |
electromagnetism
Title: How to use multipole expansion for discrete charge distribution? In page-153, Introductions to Electrodynamics by Griffiths, the following expression is given for the multipole expansion(eqtn-96):
$$ V(r) = \frac{1}{4 \pi \epsilon_o} \sum_{n=0}^{\infty} \frac{1}{r^{n+1} } \int (r')^n P_n( \cos ... | {
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"tags": "electromagnetism",
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} |
### Testimonials
November 22, 2016
Working with Mr. Angel Aguero was truly a highly learning experience. Not only was I able to learn college level Statistics in a very short amount of time, but I learned it in a very friendly and genuine environment. Mr. Aguero is a very caring, loving, and highly intellectual indiv... | {
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"tags":... |
ros
And here's my ps3_gamepad.launch file
<?xml version="1.0"?>
<launch>
<arg name="joy_dev" />
<node name="joy_node" pkg="joy" type="joy_node" output="screen">
<param name="dev" value="$(arg joy_dev)" />
</node>
<!-- Note that axis IDs are those from the joystick message plus one, to be able to invert a... | {
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"tags": "ros",
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} |
measurements, standards, nomenclature
Title: What is the engineering standard for filenames with fractions and inches? I need to save some engineering files that need the thicknesses in the filename. Windows hates "/" or "\", so I can't use a simple fraction. Symbols like this...
⅓, ⅔, ⅕, ⅖, ⅗, ⅘, ⅙, ⅚, ⅛, ⅜, ⅝, ⅞
...... | {
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"openwebmath_score": null,
"tags": "measurements, standards, nomenclature",
"url": null
} |
slam, navigation, rgbd6dslam, rgbd, ros-fuerte
Title: ROS rgbdslam fuerte support?
I want to know when will there be support for rgbdslam in fuerte. I tried to tinker with the electric supported version to make it run in fuerte but could not get it to work. If someone has found a way around please let me know.
The er... | {
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"tags": "slam, navigation, rgbd6dslam, rgbd, ros-fuerte",
"url": null
} |
quantum-mechanics, wavefunction, microscopy
Why the image shows ripples
The answer has two parts: what causes the ripples, and why the act of observation doesn't destroy the ripples.
First consider what causes the ripples. An electron can have a wavefunction that is mostly concentrated near the surface of the materia... | {
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"tags": "quantum-mechanics, wavefunction, microscopy",
"url": null
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python, python-3.x, comparative-review, iterator
T = TypeVar('T', bound=int | float)
@dataclass
class Rankine(Generic[T]):
value: T
Then, you can write conversion methods in a generic manner.
User's Pick
Let the user pick the type they wish automatically, and do not change it "under their back" with an option:
... | {
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"tags": "python, python-3.x, comparative-review, iterator",
"url": null
} |
ros, rostopic
Original comments
Comment by Vic on 2021-10-19:
Regarding injecting things by simultaneous dependencies, you can always use the string ros message type and boost serialize to avoid changing your topics and just maintaining an object doing that
Comment by gvdhoorn on 2021-10-19:
I'm not sure I understand ... | {
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"tags": "ros, rostopic",
"url": null
} |
c++, recursion, template, c++20, constrained-templates
// recursive_transform function implementation (the version with unwrap_level, without using view)
template<std::size_t unwrap_level = 1, class T, class F>
requires (!std::ranges::view<T>)
constexpr auto recursive_transform(const T& input, const F& f)... | {
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"tags": "c++, recursion, template, c++20, constrained-templates",
"url": null
} |
c#, multithreading, socket, chat
private void disconnected_ui()
{
txtClientList.Text = "";
txt_chat.Text = "";
txt_chat.IsEnabled = false;
txt_send.IsEnabled = false;
txtClientList.IsEnabled = false;
bt_send.IsEnabled = false;
bt_disconnect.IsEnabled = false;... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c#, multithreading, socket, chat",
"url": null
} |
My first question is: Why does these disks $D_n$ exist? Suppose they do exist. I can prove (a) and (b). But how can I prove part (c)?
I'm really confused. Should I construct the disks $D_n$ / the function $f$ explicitly or just show the existence?
• If I take $f(t)=1$ then I get $L(f)=2\pi(1-\sum_n r_n)$. Why this is... | {
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"openwebmath_score": 0.9735835194587708,
"tag... |
general-relativity, special-relativity, differential-geometry, metric-tensor, anti-de-sitter-spacetime
(\xi,\zeta)=\xi^\mu g_{\mu\nu} \zeta^\nu
\end{equation}
If the embedding space is Riemannian the rhs is positively definite and that means that $h_{ab}$ is also positively definite i.e. Riemannian.
If you consider th... | {
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"tags": "general-relativity, special-relativity, differential-geometry, metric-tensor, anti... |
beginner, php, security, regex
$this->clean['error'] = false; //No errors yet
foreach ($this->clean as $field) { //Loop trough each field
if (!isset($field)) {
$this->clean['error'] = true; //Yup there are errors
}
}
... | {
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"tags": "beginner, php, security, regex",
"url": null
} |
java, array, matrix
In this case we do define | {
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"tags": "java, array, matrix",
"url": null
} |
c++, factory-method, c++20, abstract-factory
rs2::playback play(profile.get_device());
play.set_real_time(false);
return {std::move(cfg), std::move(pipe), std::move(profile)};
}
video_file_image_sequence_reader(std::tuple<rs2::config, rs2::pipeline, rs2::pipeline_profile> t) :
cfg_(st... | {
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"tags": "c++, factory-method, c++20, abstract-factory",
"url": null
} |
special-relativity, time, relativity, reference-frames, observers
That's special relativity, but the one who really experiences slower decay or the relativistic effects is the man who is accelerating. So, yeah, time is relative to protect the constancy of the speed of light.
Hope it helps. And give it time. It has bee... | {
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... |
machine-learning, r, metadata, meta-learning
You aren't iterating over anything in your foreach loop to give any benefit to running in parallel. The overall idea of running stuff in parallel (in this context, anyway) is to run the exact same piece of code (i.e. a function) on each worker node, but with different input... | {
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"url": null
} |
Conversely, suppose that there exists a map $G \times X \to X$ such that
$1 \cdot x=x, \ \ \ (g_1g_2) \cdot x=g_1 \cdot (g_2 \cdot x),$
for all $g_1,g_2 \in G, \ x \in X.$ Now define the map $f: G \to \text{Sym}(X)$ by $f(g)(x)=g \cdot x$ for all $g \in G$ and $x \in X.$ So we need to prove two things: $f$ is basical... | {
"domain": "wordpress.com",
"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.99253935499126,
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"lm_q2_score": 0.8104789178257654,
"openwebmath_perplexity": 53.15373097102637,
"openwebmath_score": 0.984871506690979,
"tags": nul... |
javascript, json
const navData = [
{title: 'Game', link: '/games'},
{title: 'Community', link: '/community', keyName: 'community', submenu: [
{title: 'Media', link: '/media', keyName: 'media2', submenu: [
{title: 'Barbarian', link: '/barbarian'},
{title: 'Demon Hunter', link: '/demon-hunter'},
... | {
"domain": "codereview.stackexchange",
"id": 27571,
"lm_label": null,
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"lm_q1_score": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "javascript, json",
"url": null
} |
c++, recursion, template, c++20, constrained-templates
template<std::size_t unwrap_level, template<class, std::size_t> class Container,
typename T,
std::size_t N>
requires ( std::ranges::input_range<Container<T, N>> &&
requires { typename recursive_array_unwrap_type<
... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c++, recursion, template, c++20, constrained-templates",
"url": null
} |
homework-and-exercises, electromagnetism
Title: Current Carrying Coil - Torque i'm stuck on how to answer the last part of this question and would really appreciate some pointers.
A rectangular coil (sides $a = 15 \, \mathrm{cm}$ and $b = 20 \, \mathrm{cm}$, $m= 15 \, \mathrm{g}$), is suspended by one
of its shorte... | {
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"tags": "homework-and-exercises, electromagnetism",
"url": null
} |
ros, catkin, rosws, wiki
Title: Catkin overlay tutorial
http://ros.org/wiki/catkin/Tutorials/workspace_overlaying
When I try "wstool init" in section 3.2 i get the following error :
$ wstool init
ERROR: Cannot find required rosinstall library version, check your installation (also of vcstools) is up-to-date. One freq... | {
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"tags": "ros, catkin, rosws, wiki",
"url": null
} |
ros, gazebo, simulation, roslaunch, turtlebot
Originally posted by ymn93 on ROS Answers with karma: 41 on 2015-07-23
Post score: 4
I had this problem too, the next tutorial teaching you how to customise turtlebot_stage gives you some clues but when I tried to set the world and map files via the command line it still ... | {
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"tags": "ros, gazebo, simulation, roslaunch, turtlebot",
"url": null
} |
blood-circulation, skin, pathogenesis, congestion
Title: Pathogenesis of chronic venous congestion in skin? I think CVC cannot lead to heart failure primarily.
So let's think its pathogenesis in skin now only.
I think the pathogenesis is like this | {
"domain": "biology.stackexchange",
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# Align multiple lines in 'multline' command
\begin{multline}
e^{-\lambda T} = ( 1 - \log S_j^* (T))^{\frac{1}{1-\theta}} \\
- \lambda T = \dfrac{1}{1-\theta} \log ( 1 - \log S_j^*(t)) \\
T = \dfrac{1}{\lambda (\theta-1)} \log ( 1 - \log S_j^*(t))
\end{multline}
I have three lines of equations which appears like th... | {
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"openwebmath_score": 1.0000098943710327,
"ta... |
beginner, ruby, homework
This seems to be a global reference. I can't imagine that's a good thing. Consider moving that list into a class, such as the Appointment class.
if x.get_month == month
I suggest it would be more natural to phrase that as x.date.mon.
Your recurring Day & Month classes appear to be uni... | {
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} |
performance, c, parsing, chess
exit(1);
}
pos->irreversible = malloc(sizeof(struct irreversible_state));
if (!pos->irreversible) {
fprintf(stderr, "Could not allocate memory.\n");
exit(1);
} | {
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"openwebmath_score": null,
"tags": "performance, c, parsing, chess",
"url": null
} |
reaction-mechanism, stereochemistry
The reason we see the syn-addition more often is because the Hydrogen atom attack happens really quickly (it's the kinetic product). If you pump more heat energy into the reaction though, you could expect to see more trans product - but this is dangerous as hydrogen is explosive. | {
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"tags": "reaction-mechanism, stereochemistry",
"url": null
} |
reinforcement-learning
It may be useful to arrange the action choices so that the index for drawing from each player's discard pile is considered relatively to the current player's turn. That is, instead of actions being arranged $[draw, discard P1, discard P3, discard P4, discard P5]$ for P2, they would be arranged $... | {
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"tags": "reinforcement-learning",
"url": null
} |
special-relativity, metric-tensor, tensor-calculus, inertial-frames, lorentz-symmetry
The rank $k$ tensor is then a generalization of the above where our function $K$ has $k$ slots for vector arguments, instead of only one.
To finish the idea off, we have the idea that vectors can be mapped bijectively to covectors an... | {
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"tags": "special-relativity, metric-tensor, tensor-calculus, inertial-frames, lorentz-symme... |
to the solution of a polynomial equation. 1: The Laplace Transform The Laplace transform turns out to be a very efficient method to solve certain ODE problems. APPLICATION OF THE LAPLACE TRANSFORM TO CIRCUIT ANALYSIS LEARNING GOALS Laplace circuit solutions Showing the usefulness of the Laplace transform - A free Power... | {
"domain": "lampertifashion.it",
"id": null,
"lm_label": "1. Yes\n2. Yes",
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"lm_q1_score": 0.9883127406273589,
"lm_q1q2_score": 0.8828690715365637,
"lm_q2_score": 0.8933094103149355,
"openwebmath_perplexity": 1052.2003106046586,
"openwebmath_score": 0.8233507871627808,
"t... |
python, algorithm, python-3.x, programming-challenge, array
def best_sum_accum(array):
running_min = 0
max_difference = 0
for cumsum in accumulate(array):
if cumsum > running_min:
max_difference = max(max_difference, cumsum - running_min)
running_min = min(running_min, cumsum)
... | {
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"openwebmath_score": null,
"tags": "python, algorithm, python-3.x, programming-challenge, array",
"url": null
} |
performance, strings, powershell, edit-distance
# The cell diagonally above and to the left plus the cost
$cellUpperLeft = $comparisonMatrix[($rowIndex-1),($columnIndex-1)] + $cost
Write-Verbose "Cell Upper Left: [$($rowIndex-1),$($columnIndex-1)] + cost($cost) = $cellUpperLeft"
# ... | {
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"openwebmath_score": null,
"tags": "performance, strings, powershell, edit-distance",
"url": null
} |
quantum-mechanics, wavefunction, hilbert-space, variational-principle, hamiltonian
There is another alternative proof here which I also can not follow.
http://www.nyu.edu/classes/tuckerman/quant.mech/lectures/lecture_3/node1.html I don't find this proof a good one, since the notation is messy and not very clear (not t... | {
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"tags": "quantum-mechanics, wavefunction, hilbert-space, variational-principle, hamiltonian... |
ros, ros2, libopencv, rosbridge
OpenCV version 4.2.0
I also install
sudo apt-get install ros-noetic-vision-opencv
Originally posted by sgttrieu on ROS Answers with karma: 16 on 2021-06-24
Post score: 0
The problem is solved. I did not pay attention that I leave a " } " in the target_link_libraries configuration.
Or... | {
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"tags": "ros, ros2, libopencv, rosbridge",
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} |
The circles have centers $P$ and $Q$ and radius 3.
They are placed in opposite corners of the rectangle.
Center P and Q with point R form a right triangle
. . with legs: . $PR = 8,\:QR = 6$
Therefore: . $PQ \,=\,10$ | {
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"openwebmath_score": 0.6858904361724854,
"tag... |
php, design-patterns, mvc, form
protected function __construct($pdo_link) {
$this->database = $pdo_link;
}
abstract protected function insert();
abstract protected function update();
abstract protected function delete();
protected function checkNullFields($reqFields) {
foreach ($reqFields as $i => $value... | {
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"tags": "php, design-patterns, mvc, form",
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} |
c++, memory-management, io, video
You can’t get any faster than that.
Wait, you may be thinking… creating an array buffer, then manually copying the integer byte-by-byte while doing all those arithmetic operations… surely that can’t be as efficient as a __bswap_32 compiler intrinsic?!
Wanna bet?
There are two function... | {
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"tags": "c++, memory-management, io, video",
"url": null
} |
the-sun, earth, obliquity, time
Title: Effect of the obliquity of the ecliptic / tilt of the Earth on the equation of time In attempting to answer the question “why aren’t changes in sunset and sunrise times symmetrical around the solstices ?” I’ve got stuck on being able to explain the effect of the obliquity of the... | {
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"tags": "the-sun, earth, obliquity, time",
"url": null
} |
computer-architecture, cpu-cache, memory-access
That means you have to add up the access times of all contributing levels.
Some of the options seem to suggest one might think that whole blocks from, say, L2 cache are transferred upwards to L1 cache; as far as I know, that is not what happens: transfer volume is deter... | {
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"tags": "computer-architecture, cpu-cache, memory-access",
"url": null
} |
python, object-oriented, design-patterns
except Exception as ex:
print ex
raise ex
def config(self):
'''
Builds config settings for firehose
'''
return {
'RoleARN': 'arn:aws:iam::123456789:role/example_role',
'BucketARN': 'arn:aws:s3... | {
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"openwebmath_score": null,
"tags": "python, object-oriented, design-patterns",
"url": null
} |
c#, programming-challenge
//GetWordlength / DictionaryLength / Number of testCases
int[] ldnValues = inputLines.First().Split(' ').Select(intString => int.Parse(intString)).ToArray();
var LettersInWord = ldnValues[0];
var WordsInLanguage = ldnValues[1];
var NumberOfTestCases = ldnValues[2];
string[] vocabulary = in... | {
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"openwebmath_score": null,
"tags": "c#, programming-challenge",
"url": null
} |
python, django
The slug is generated from the question title.
Then it was brought to my attention that I don't need to save the form first:
class QuestionCreate(generic.CreateView):
model = Question
fields = ['title', 'text']
def form_valid(self, form):
slug = slugify(form.cleaned_data['title'])
... | {
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"openwebmath_score": null,
"tags": "python, django",
"url": null
} |
c#, unity3d
if (pedal > 0.1)
{
hasBrakeReset = true;
isBrake = false;
stillBacking = false;
if (!isPedal)
{
momentum = startOffSpeed;
isPedal = true;
}
if (mom... | {
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "c#, unity3d",
"url": null
} |
This is in response to @joriki's observation that the constraint of the weekly total studying hours could be loosen while the conclusion of minimum $20$ days would still hold. I am not sure if it's appropriate to post this as an answer, but it turns out to be too long to fit in the comment section.
We shall prove the ... | {
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"openwebmath_score": 0.9070085287094116,
"tag... |
homework-and-exercises, electromagnetism, electromagnetic-induction
My question is this:
Aren't the two orientations of the coil identical? Why should the flux be in different directions in that case?
I'd appreciate any help.
EDIT: I believe I haven't made myself clear as to my exact question, which reflects in one an... | {
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"tags": "homework-and-exercises, electromagnetism, electromagnetic-induction",
"url": nul... |
graph, react.js, typescript
return (
<>
{/* graph visualization */}
<StyledCanvas theme={{ expanded: visIsExpanded }} id="canvas">
<div id={containerId} />
<img
src={
visIsExpanded
? ... | {
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"openwebmath_score": null,
"tags": "graph, react.js, typescript",
"url": null
} |
php, optimization, design-patterns, classes, singleton
The Initializer class
First of, your Initializer class attempts to load classes by declaring the include path and extensions over and over and THEN load the class. This should only be done once. It happens because you have provided the name of the function autoloa... | {
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"openwebmath_score": null,
"tags": "php, optimization, design-patterns, classes, singleton",
"url": null
} |
java, classes, constructor
} else {
return false;
}
}
}
I have a file (UseIt.java) in which I use the class. My question though, is: Is it a good programming practice to either:
1. Put all your methods into one method, and simply call that one method rather than calling them all individually, ... | {
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"openwebmath_score": null,
"tags": "java, classes, constructor",
"url": null
} |
convolutional-neural-networks
Title: Are there neurons in CNNs? This might be a stupid question, and I might have read too much about neural networks and CNNs today so my mind is a bit of a mess. But I get that neural networks contains neurons or nodes. They calculate a dot product and sends the output further into th... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "convolutional-neural-networks",
"url": null
} |
bloch-sphere
where $|0 \rangle$ and $|1\rangle$ are the computational basis and they defined as
$$ |0\rangle = \begin{pmatrix} 1 \\ 0 \end{pmatrix} \ \ \ \ |1\rangle = \begin{pmatrix} 0 \\ 1 \end{pmatrix} $$
and $\alpha, \beta \in \mathbb{C}$. So we have that $|\psi \rangle \in \mathbb{C}^2 $ and you can think of $\ma... | {
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"openwebmath_score": null,
"tags": "bloch-sphere",
"url": null
} |
The Integral
1. Jun 27, 2007
anantchowdhary
Is there a mathematical proof that can prove that the integral is the antiderivative?
2. Jun 27, 2007
Staff: Mentor
fundamental theorem of calculus
Look up the fundamental theorem of calculus.
3. Jun 27, 2007
anantchowdhary
umm...ive tried to study it....but my ques... | {
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"openwebmath_score": 0.8898789286613464,
... |
statistical-mechanics
Thanks for reading.
On a side note, Pathria has been incredible to read, and has tied together many theoretical pieces of stat. mech. for me. Your four questions are strongly connected. However, for clarity, I'll keep your numbered list as a reference for my answer. | {
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"tags": "statistical-mechanics",
"url": null
} |
discrete-signals, convolution, linear-algebra
Title: Circular Convolution as Cyclic Shift Operator Given the following signal vectors:
$$ γ=[ψ_0,0,ψ_1,0,ψ_2,0,…,ψ_{N-1},0]^T\in \mathbb{R}^{2N}, ϕ=[1,\frac{1}{2},0,…,0,\frac{1}{2}]^T \in \mathbb{R}^{2N}$$
I want to show that the convolution of $γ$ and $ϕ$ is actually a ... | {
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"tags": "discrete-signals, convolution, linear-algebra",
"url": null
} |
opposite one another at the intersection are called Vertically Opposite Angles. Two angles that overlap, one inside the other sharing a side and vertex in the figure on the right, the two angles ∠PSQ and ∠PSR overlap. Both sets (top and bottom) are supplementary but only the top ones are linear pairs because these ones... | {
"domain": "lviv.ua",
"id": null,
"lm_label": "1. Yes\n2. Yes",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9879462197739625,
"lm_q1q2_score": 0.8701801451218689,
"lm_q2_score": 0.8807970795424088,
"openwebmath_perplexity": 686.3562189789515,
"openwebmath_score": 0.5223283767700195,
"tags": null,
... |
c#, programming-challenge, interview-questions
Title: Find the smallest positive number missing from an unsorted array this is the original question
https://www.geeksforgeeks.org/find-the-smallest-positive-number-missing-from-an-unsorted-array/
You are given an unsorted array with both positive and negative elements. ... | {
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"openwebmath_score": null,
"tags": "c#, programming-challenge, interview-questions",
"url": null
} |
beginner, c, reinventing-the-wheel, utf-8
{0xA980, 0xA9DF, "Javanese",0},
{0xA9E0, 0xA9FF, "Myanmar Extended-B",0},
{0xAA00, 0xAA5F, "Cham",0},
{0xAA60, 0xAA7F, "Myanmar Extended-A",0},
{0xAA80, 0xAADF, "Tai Viet",0},
{0xAAE0, 0xAAFF, "Meetei Mayek Extensions",0},
{0xAB0... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "beginner, c, reinventing-the-wheel, utf-8",
"url": null
} |
fft
Title: How can I decide proper FFT length(size)? I'm trying to understand about deciding FFT length(size) and relative factors.
what If I got the streaming adc data as the below,
1624
20850
10314
-15042
-18908
3717
21175
8479
-16411
-17907
5796
21308
6493
-17713
-16662
7687
21241
4468
-18724
-15291
9750
20929
2392... | {
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"id": 9707,
"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": "fft",
"url": null
} |
coq, dependent-type, calculus-of-constructions
The reason it is not widely used is because impredicative quantification is incompatible with classical logic. If you have it, you cannot give a model of type theory where types are interpreted as sets in the naive way --- see John Reynolds's famous paper Polymorphism is ... | {
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"id": 2703,
"lm_label": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "coq, dependent-type, calculus-of-constructions",
"url": null
} |
quantum-mechanics, quantum-field-theory, conformal-field-theory
Title: constraint on scaling dimension How can we show that for any scalar operator $\Delta\geq1$ (where $\Delta$ is the scaling dimension)?
Where can I find a reference for reading where it comes from? This is a consequence of the Lehman spectral represe... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "quantum-mechanics, quantum-field-theory, conformal-field-theory",
"url": null
} |
ros, leg-detector, people
Title: Training data for leg_detector?
Looking at the outputs from the leg_detector package, I'm wondering if it could benefit from a more diverse set of training examples. Notably, the detection confidence falls quickly as people move away from the laser and it is fooled easily by round ob... | {
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"id": 16709,
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "ros, leg-detector, people",
"url": null
} |
c, game, curses
char get_piece(const int, const int, struct Game *);
void set_piece(const int, const int, const char, struct Game *);
int get_strength(const char);
char get_color(const char);
int is_stronger_than(const char, const char);
void render_board(struct Game *);
void render_screen(struct Game *);
void print_i... | {
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"tags": "c, game, curses",
"url": null
} |
entomology, biochemistry
Title: What's the maximum pressure inside a bombardier beetle? This question got me wondering about the pressure inside a bombardier beetle.
Lots of articles mention pressure, but don't specify the amount of it:
One study records the velocity of the spray to be within a range of 325 to a stun... | {
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"id": 3549,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "entomology, biochemistry",
"url": null
} |
huffman-coding
Example 1: $\{00,01,10,110\}$
The code is a prefix code, but is the length minimal? I mean it's a bit unusual for me to see Huffman code
for $4$ symbols that does not have one-bit codeword for one of its
symbol (the symbol with highest probability), but them I thought maybe
the first three symbols are e... | {
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"id": 12122,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "huffman-coding",
"url": null
} |
homework-and-exercises, fluid-dynamics, flow
Title: Basic fluid dynamics problem
"A hypodermic syringe contains a medicine with the density of water (Figure 6). The barrel of the syringe has a cross-sectional area A = 2.50 * 10^-5 m2,
and the needle has a cross-sectional area a = 1.00 * 10^-8 m2. In the absence of a... | {
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"tags": "homework-and-exercises, fluid-dynamics, flow",
"url": null
} |
special-relativity, spacetime, coordinate-systems, inertial-frames
$$\Delta x'=\gamma \Delta x -\gamma \beta \Delta t \ \Rightarrow \ \Delta x'=\gamma \Delta x$$
and length contraction is proven. Is there something I am missing? (Maybe is not correct to state that the temporal distance of the ends of the rod for $O$ i... | {
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"tags": "special-relativity, spacetime, coordinate-systems, inertial-frames",
"url": null... |
python, python-3.x, discord
webhook.add_embed(embed)
# Adding thread so each URL can post as fast as possible without needing to wait for each other
Thread(
target=post_embed,
args=(
payload,
region,
webhook
)
... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python, python-3.x, discord",
"url": null
} |
problem (see next section). The least-squares line. Data to fit, specified as a matrix with either one (curve fitting) or two (surface fitting) columns. Curve Fitting Curve fitting is nothing but approximating the given function f(x) using simpler functions say polynomials, trignometric functions, exponential functions... | {
"domain": "from.bz",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.986151391819461,
"lm_q1q2_score": 0.8239132569964246,
"lm_q2_score": 0.8354835411997897,
"openwebmath_perplexity": 896.0800361771716,
"openwebmath_score": 0.7048426866531372,
"tags": nul... |
python, beginner, hangman
missed.append(guess)
print("Sorry the letter ", guess , "is not in the word." ,"Now you have" , attempts , "attempts")
if attempts == 0:
print("You didn't guess the word.The word was" , get_word)
print("".join(result),"\nMissed letters a... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python, beginner, hangman",
"url": null
} |
c#, performance, .net, statistics, benchmarking
totalTime += sw.ElapsedTicks;
sw.Reset();
}
double variance = m2 / (totalValues - 1);
return new BenchmarkResult
{
AverageTime = new TimeSpan(Convert.ToInt64(averageTicks)),
MaxTime = new TimeSpan(max... | {
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"openwebmath_score": null,
"tags": "c#, performance, .net, statistics, benchmarking",
"url": null
} |
quantum-mechanics, wavefunction, schroedinger-equation, scattering, boundary-conditions
Well, you have 6 constants, but only 4 boundaries. Of course, the final goal is to write the final wavefunction $\psi(x)$ in terms of only ONE constant (let's say $A$). To achieve this, I need 5 boundary conditions. But I only have... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "quantum-mechanics, wavefunction, schroedinger-equation, scattering, boundary-condi... |
reference-request, type-theory
Title: Type-system combining type-states and typed effects? Has anyone succeeded in implementing or designing a type-system that combines both type-state (linear types) and effect types (e.g. Koka)? Edwin Brady has done some work in that area using dependent types in IDRIS. Take a look a... | {
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"lm_q2_score": null,
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"openwebmath_score": null,
"tags": "reference-request, type-theory",
"url": null
} |
rviz
[ INFO] [1478886940.755884163]: compiled against OGRE version 1.8.1 (Byatis)
[ INFO] [1478886940.856285919]: Stereo is NOT SUPPORTED
[ INFO] [1478886940.856367826]: OpenGl version: 3 (GLSL 1.3).
Any advice or recommendation?
Thanks! | {
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"tags": "rviz",
"url": null
} |
electromagnetism, field-theory, charge-conjugation
-\mathcal{j}_\mu\mathcal{C}A^\mu(x)\mathcal{C}^{-1} &= \mathcal{j}_\mu(x)A^\mu(x)\\
\mathcal{C}A^\mu(x)\mathcal{C}^{-1} &= -A^\mu(x)
\end{align}
Specifically for a complex scalar field, the interaction is slightly more complicated because it is non-linear. From minima... | {
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"id": 95227,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "electromagnetism, field-theory, charge-conjugation",
"url": null
} |
ros2, yaml, parameters, rclpy
self.declare_parameter('a.e',"true")
self.b = self.get_parameter('a.b').get_parameter_value().integer_value
self.c = self.get_parameter('a.c').get_parameter_value().double_value
self.d = self.get_parameter('a.d').get_parameter_value().string_value
self.e = self.get_parameter('a.e').get_pa... | {
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"tags": "ros2, yaml, parameters, rclpy",
"url": null
} |
ros, slam, navigation, rosdep, qt4
It seems to me that the stack hasn't been ported to Fuerte yet since the rosdep definition for qt4 is unknown. That means there is a certain chance that you will run into compile problems.
Edit: Running rgbdslam is not working because you got a build error. As I said, rgbdslam doesn'... | {
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"tags": "ros, slam, navigation, rosdep, qt4",
"url": null
} |
particle-physics, particle-detectors
Particle accelerators deliver beams at fixed energies. All the event ordering algorithms depend crucially on energy and momentum conservation, that is what missing energy and missing transverse momentum are all about. To balance the event to the input energy. Anomalies on these dis... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "particle-physics, particle-detectors",
"url": null
} |
matlab, discrete-signals, fourier-transform, dft
Title: Why cant DFT be implemented this way? I am trying to implement the discrete Fourier transform.Here is my code in MATLAB:
sym k
n = 1:4;
disp(n);
y = n-2>=0;
z = n-4>=0;
x = y-z;
X(k) = sum(x.*exp(-1i*2*pi*k.*n/4));
l = 1:4;
subplot(1,2,1);
stem(l,abs(X(l)));
su... | {
"domain": "dsp.stackexchange",
"id": 11723,
"lm_label": null,
"lm_name": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "matlab, discrete-signals, fourier-transform, dft",
"url": null
} |
energy, statistical-mechanics, temperature, entropy
Whether I am correct or not, is there is any intuition behind why a low-temperature distribution's spread (entropy) would be more affected by a change in internal energy than the spread (entropy) of a high-temperature distribution?
To summarize I'm asking:
Why does i... | {
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"id": 69907,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "energy, statistical-mechanics, temperature, entropy",
"url": null
} |
performance, sql, mysql, unit-testing, stored-procedure
-- -----------------------------------------------------
-- Table `booklibinventory`.`publishinginfo`
-- -----------------------------------------------------
DROP TABLE IF EXISTS `booklibinventory`.`publishinginfo` ;
CREATE TABLE IF NOT EXISTS `booklibinventory... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "performance, sql, mysql, unit-testing, stored-procedure",
"url": null
} |
deep-learning, convolutional-neural-networks, comparison, recurrent-neural-networks, implementation
In short, CNNs are meant to detect local features in volume data, while RNNs preserve information over their previous internal state while processing the next data sample.
Probably one of the best online resources walki... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "deep-learning, convolutional-neural-networks, comparison, recurrent-neural-networks, imp... |
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