text stringlengths 1 1.11k | source dict |
|---|---|
power-spectral-density, spread-spectrum, dsss
Regardless, the spread of the estimate of the signal's PSD will always be larger than the spread of the estimate for the noise PSD alone, given in the OP's case we have 1 million independent samples of noise. In contrast, we only have about 1950 independent data samples (g... | {
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"tags": "power-spectral-density, spread-spectrum, dsss",
"url": null
} |
visible-light, scattering, atmospheric-science
Title: Why is the sky blue: For a 3-year old My nephew asked me yesterday why the sky was blue. I tried to explain it to him as best and as dumbly I could, but I failed. I tried to explain the concept of scattering of light using an analogy of colliding marbles, but I was... | {
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"tags": "visible-light, scattering, atmospheric-science",
"url": null
} |
regression, relu, weights-initialization, dense-layers, learning-curve
Looking at the Dense layer docs: by default Dense layers biases are initialized with zeros (bias_initializer='zeros') and weights are initialized with Glorot uniform (kernel_initializer='glorot_uniform').
... "unusual" element to point here; I've... | {
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"url": null
} |
c#, web-scraping, reddit, webdriver
timer1.Start();
}
}
}
}
Here is what my program looks like after running for about 20 seconds:
I use the beloved CefSharp for my web browser.
Invoke((MethodInvoker)delegate
{
bool exists = false;
foreach (ListViewItem item in listView1.Items)
... | {
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"tags": "c#, web-scraping, reddit, webdriver",
"url": null
} |
catkin
Originally posted by ahendrix with karma: 47576 on 2014-02-26
This answer was ACCEPTED on the original site
Post score: 3
Original comments
Comment by joq on 2014-02-26:
Good catch! I looked at that code too, but could not figure out how it had ever worked.
Comment by Dan Lazewatsky on 2014-02-26:
Thanks, that... | {
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integrable-systems, spin-models, spin-chains
In short: to the best of my knowlegde, coming up with an R-matrix is an art, not a derivation. (Cf. the notion of a Lax pair in classical integrability.)
The quantum inverse-scattering method (QISM) was developed as a synthesis of the classical ISM, spin chains and lattice... | {
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which has 30 blocks, and derive a (2,3,9), which is P by deleting
a point I. Since any three points of D determine a unique block,
we must add 18 4-element subsets of P that meet no line in more than
2 points -- that is, ovals -- and also meet each other in at most 2 points.
The key fact is that any oval O in P can be... | {
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"tags": n... |
python, python-3.x, math-expression-eval
Style
You have docstrings. That's a definite plus. You also follow the proper naming conventions for methods and variables, and there is adequate commenting, so no issues there.
However, a minor peeve - do you really need that line continuation when declaring the operators list... | {
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"tags": "python, python-3.x, math-expression-eval",
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} |
vba, excel, rubberduck
'@TestCleanup
Public Sub TestCleanup()
'this method runs after every test in the module.
End Sub
'@TestMethod
Public Sub GivenAssetInTable_GetTicker()
On Error GoTo TestFail
'Arrange:
Dim tbl As IAssetInfoService
Set tbl = AssetInfoService.IAssetInfoService_Create(assetTbl)... | {
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organic-chemistry, nomenclature
(3) the locants of all substituent groups on the identical parent structures, including suffix groups, are identical.
When these conditions are not met, substitutive nomenclature generates preferred IUPAC names. | {
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homework, thermodynamics
Title: When an expansion of a system does work on its surroundings, is the sign for work negative? This question comes to me from trying to explain the answer $1.67\ \mathrm{L}$ of this question:
A cylinder with a moving piston expands from an initial volume of $0.250\ \mathrm{L}$ against an e... | {
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"tags": "homework, thermodynamics",
"url": null
} |
electromagnetism, optics, electrical-resistance, reflection
For specifics, assume a square grid, a wavelength of 600 nm and a grid spacing of 150 nm ($\lambda / 4$).
This question was inspired by the Space SE question How realistic is the 1 kg/km² solar sail in “Death's End”?
What is the relationship between Faraday c... | {
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"tags": "electromagnetism, optics, electrical-resistance, reflection",
"url": null
} |
java, performance, reflection, minecraft
Vector start = startLoc.toVector();
Vector direction = startLoc.getDirection().normalize().multiply(reach);
Vector end = start.clone().add(direction);
try {
Constructor<?> con = vec3DClass.getConstructor(double.class, double.class, double.class);
O... | {
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"tags": "java, performance, reflection, minecraft",
"url": null
} |
ros
Title: Any ARM, right?
It should NOT really matter which board is used (Odroid, Banana, Dragonboard, etrc), so long as its an ARM processor, right?
Originally posted by dvp1964 on ROS Answers with karma: 1 on 2016-11-26
Post score: 0
If you're wondering whether the ROS buildfarm targets a specific SBC (board), ... | {
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RonL
Well, if you hadn't replied, I wouldn't be wiping away tears of laughter right now.
8. Let's make this more generally:
If $\lim_{x\to\infty}f(x)=\lambda\implies\lim_{x\to\in fty}\frac1x\int_0^x f(y)\,dy=\lambda.$
9. Originally Posted by Krizalid
Let's make this more generally:
If $\lim_{x\to\infty}f(x)=\lambda... | {
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plugin, rqt
Comment by 130s on 2014-02-02:
@atland_t you can modify your post to paste the error you got.
Comment by Dorian Scholz on 2014-09-12:
Can you change the title of this question to "how to run a newly created rqt plugin". The Answer of "Wolf" is correct, so you can close this afterwards. I also updated the t... | {
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data-structures
Keep a FIFO of these log datas (rather than individual hits), and output the hit ratio for the entire FIFO buffer (a longer period).
Keep a weighted average of the last score and the most recent score. This works like a FIFO except it weights the more recent entries heavier, and only requires O(1) spa... | {
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ros, boost, build-from-source, libboost
-- +++ genmsg
-- +++ genpy
-- +++ gencpp
-- +++ genlisp
-- +++ rospack
-- Rospack building shared objects.
-- Boost version: 1.42.0
-- Found the following Boost libraries:
-- system
-- filesystem
-- program_options
-- +++ std_msgs
-- std_msgs: 32 messages
-- +++ ros
-- Boo... | {
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homework-and-exercises, lagrangian-formalism, field-theory, notation, poincare-symmetry
$$
(\partial_\mu a_\nu)(\partial^{\mu} \phi^* \partial^{\nu} \phi + \partial^{\nu} \phi^* \partial^{\mu} \phi)
$$
While I obtain
$$
(\partial_\mu a^\nu)(\partial^{\mu} \phi^* \partial_{\nu} \phi )\, + \, (\partial^\mu a_\nu) (\par... | {
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C-S also works because $$\sum_{cyc}\frac{x^2}{z}\geq\frac{(x+y+z)^2}{x+y+z}=x+y+z,$$ but you wanted Rearrangement.
We can prove this inequality also by $uvw$, AM-GM, BW and more.
• so How to use Rearrangement? – wightahtl Aug 28 '17 at 14:20
• care to explain the first inequality? – windircurse Aug 28 '17 at 14:22
• ... | {
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"tag... |
electricity, conductors, dielectric
will not create unwanted electrical conduction paths, which is important in some applications. It is a label that has no known strict
definition, but it does exclude conductive-particle loaded products. | {
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We thus have $$|x + 1| = \begin{cases} x + 1, & x + 1 \geq 0 \\ -(x+1), & x + 1 < 0 \end{cases} = \begin{cases} x + 1, & x \geq -1 \\ -x - 1, & x < -1 \end{cases}$$ $$|x - 1| = \begin{cases} x - 1, & x - 1 \geq 0 \\ -(x - 1), & x - 1 < 0 \end{cases} = \begin{cases} x - 1, & x \geq 1 \\ -x + 1, & x <1\text{.} \end{cases... | {
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"lm_q1q2_score": 0.8401196370453634,
"lm_q2_score": 0.8539127510928476,
"openwebmath_perplexity": 235.23421720543723,
"openwebmath_score": 0.9894774556159973,
"ta... |
energy, photons, terminology, mass-energy, antimatter
Title: What is "pure energy" in matter-antimatter annihilation made of? I used to read the term "pure energy" in the context of matter-antimatter annihilation. Is the "pure energy" spoken of photons? Is it some form of heat? Some kind of particles with mass?
Bas... | {
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"tags": "energy, photons, terminology, mass-energy, antimatter",
"url": null
} |
newtonian-mechanics, newtonian-gravity, orbital-motion, perturbation-theory, oscillators
The last picture in the bottom right corner is what I'm talking about. Instead of that, shouldn't the orbit just become slightly more elliptical? This entire confusion boils down to a misinterpretation of the source material. When... | {
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"tags": "newtonian-mechanics, newtonian-gravity, orbital-motion, perturbation-theory, oscil... |
php, classes, mysqli
<div>Name: <?php echo htmlentities($userInfo->getName()); ?></div>
<div>Email: <?php echo htmlentities($userInfo->getEmail()); ?></div>
[...]
For debug purposes you could still add a toString method with returns a string of all array values.
If you do it like this, not only is your class a lot ea... | {
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"tags": "php, classes, mysqli",
"url": null
} |
machine-learning, reinforcement-learning, policy-gradients, experience-replay
Title: What information should be cached in experience replay for actor-critic? Experience replay is buffer (or a "memory") of transactions $e_t = (s_t, a_t, r_t, s_{t+1})$.
The equations for calculating the loss in actor critic are an
acto... | {
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"tags": "machine-learning, reinforcement-learning, policy-gradients, experience-replay",
"url": ... |
homework-and-exercises, newtonian-mechanics, newtonian-gravity, acceleration, approximations
If anyone could point me in the right direction or give me a hint it would be very much appreciated
Edit: The question is P1.5 from Moore's General Relativity Workbook When you have an expression of the form $(a + b)^n$, where... | {
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electromagnetism, lagrangian-formalism, electric-circuits, inductance, waveguide
$$V(x,t)=\partial_t \phi(x,t), \quad I(x,t)=-\frac{1}{l_0} \partial_x \phi(x,t) $$
automatically imply, by the equality of mixed partial derivatives ($\partial_x \partial_t \phi = \partial_t \partial_x \phi$), the result
$$\partial_x V = ... | {
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"tags": "electromagnetism, lagrangian-formalism, electric-circuits, inductance, waveguide",... |
gazebo-1.9, sdformat
Error [parser.cc:520] Unable to find uri[model://Modified_Hokuyo]
Exception [Joint.cc:137] Couldn't Find Child Link[hokuyo::link]
Error [Model.cc:153] LoadJoint Failed
Heres what the include in the sdf looks like:
<include>
<uri>model://Modified_Hokuyo</uri>
<pose>.25 0 0.2675 0 0 0</po... | {
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"tags": "gazebo-1.9, sdformat",
"url": null
} |
nmr-spectroscopy
(Note that if there is a complicated explanation that I am currently only at Year 12 VCE level, so links to resources I can pursue would be extremely helpful! It's been established that VCAA (an authority for the education system in Australia) ensures that the chemicals featured in the exams for NMR a... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "nmr-spectroscopy",
"url": null
} |
ros, external-libraries
So now I want to add ROS stuff to the file so I can publish data as ROS Topics. This is where I don't know what to do. I added
#include <ros/ros.h>
to the file and I got lots of compile errors. Lots of header files were not found.
It occurred to me that all my other ROS code was cpp files, ... | {
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the-sun, history
First of all, in the late 1960's the 5-minute solar oscillations on the surface of the sun have beend discovered. Those have been recognized as surface features of internal pressure waves with penetration depth $d$, wavenumber $k$ and their relation roughly $d \sim \frac{1}{\sqrt{k}}$.
So from the me... | {
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"url": null
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P-51 Tank Buster, Staffordshire Bull Terrier Vs Pitbull Fight, Taino Symbols And Meanings, Nissin Demae Ramen Tonkotsu, Audi Q4 Release Date, Easy Spatial Reasoning Test, Second Hand Scoot Boots For Sale, New European College Intake, | {
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"lm_q1_score": 0.9777138105645059,
"lm_q1q2_score": 0.8147529614725092,
"lm_q2_score": 0.8333245911726382,
"openwebmath_perplexity": 486.0355546145191,
"openwebmath_score": 0.8772138953208923,
"tags": nul... |
inorganic-chemistry, physical-chemistry, electrochemistry, reduction-potential
Lide, David R., ed. CRC Handbook of Chemistry and Physics, 87th ed. Boca Raton, FL: CRC Press. 2006. ISBN 0-8493-0487-3. | {
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javascript, beginner, html
// tell user to select any missing values
if( grade === undefined || grade == ""){
document.getElementById("message").innerHTML = "Select grade.";
return;
}
else if ( thread === undefined || thread === null){... | {
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milky-way, apparent-magnitude, magellanic-cloud
Title: What is the apparent magnitude of the Milky Way from the viewpoint of the Large Magellanic Cloud? Wikipedia contains the essentially unsourced claim that
From a viewpoint in the LMC, the Milky Way's total apparent magnitude would be −2.0—over 14 times brighter th... | {
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"tags": "milky-way, apparent-magnitude, magellanic-cloud",
"url": null
} |
homework-and-exercises, kinematics, projectile
$$s=s_0+v_0t+\frac 12 at^2\\
s=s_0+\frac 12(v_0+v) t\\
v=v_0+at\\
v^2=v_0^2+ 2a(s-s_0)$$
These equations count along any path. The $s$ can be replaced with a $x$ when looking at a horizontal path (the speeds and acceleration shall then also be for this horizontal directio... | {
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"url": null
} |
newtonian-mechanics, forces
Then what's the use of this second blade beneath If the first blade is doing the same work? | {
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"url": null
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special-relativity, spacetime, metric-tensor, time, conventions
Title: What is the meaning of the negative sign in $\Delta s^2 = \Delta x^2 + \Delta y^2 + \Delta z^2 - (c\Delta t)^2$? In the equation of the spacetime interval formula $\Delta s^2 = \Delta x^2 + \Delta y^2 + \Delta z^2 - (c\Delta t)^2$ is there meaning ... | {
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Here we used integral of inverse functions: $$\int_c^df^{-1}(y)\,\mathrm dy+\int_a^bf(x)\,\mathrm dx=bd-ac.$$
Note: Since $$|f_n(x)|\le 1$$ and $$1$$ is integrable on $$[0,\pi]$$, we could interchange limit sign and integral sign from dominated convergence theorem, that is, $$L:=\lim_{n\to\infty}\int_0^\pi f_n(x)\,\ma... | {
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"tag... |
ros, uvc-cam, uvc-camera
[ERROR] [1416758429.428031518]: Rectified topic '/camera/image_rect' requested but camera publishing '/camera/camera_info' is uncalibrated
INFO about calibration:
first to get camera topics I run
rosrun uvc_camera uvc_camera_node
when I call rostopic list I get:
/camera_info
/image_raw
/image... | {
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particle-physics, quantum-chromodynamics, mesons, quark-gluon-plasma
[*] As a side note, this has an immense benefit: perturbative calculations are particularly effective for processes involving the top quark as this is all there is. I am only talking about the production and decay mechanism of course, as the decay pr... | {
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ros2
rclcpp::spin(depth_node);
rclcpp::shutdown();
return 0;
}
The error I get is this -
colcon build --packages-select stereo_ground_surface
Starting >>> stereo_ground_surface
--- stderr: stereo_ground_surface
/home/hsharma/Documents/internship/ws/ros2_ws/src/stereo_ground_surfac... | {
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"url": null
} |
kinect, openni-camera
Title: openni_camera error "bad parameter"
I am able to use the openni_camera node with the command "roslaunch openni_camera openni_node.launch". However, if I try to use any other nodes that require openni_camera (such as openni_tracker or rviz), openni_camera fails. Previously, I had a differe... | {
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3Blue1Brown
# Chapter 4Trig Derivatives through geometry
Let's try to reason through what the derivatives of the functions sine and cosine should be. For background, you should be comfortable with how to think about both of these functions using the unit circle; that is, the circle with radius $1$ centered at the ori... | {
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My first question is whether there is any literature or sources on explicitly finding the relationship between $\rho$ and $Corr(X,T)$? That way I can predefine this correlation, rather than $\rho$. And my second is whether this is the best way to simulate this kind of data? Note that in the work that I'm doing, there i... | {
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"lm_q1q2_score": 0.8282078987532198,
"lm_q2_score": 0.845942439250491,
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"openwebmath_score": 0.9210349917411804,
"tag... |
beginner, haskell
This calculates shiftList freq2 x for every x from 0 to 25, but shiftList works by generating the full list iterate oneCycle freq and then selecting element x, so you would have been better off writing:
norms = map (norm freq1) (take 26 $ iterate oneCycle freq2)
Actually, a more common way of calcul... | {
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c++, reinventing-the-wheel, simulation, gui
for(size_t i = 0; i < buses.size(); ++i){
cout << buses[i];
}
}
BusStop.h
#pragma once
#include "Passenger.h"
#include "Autobus.h"
#include "NecessaryHeaders.h"
using namespace std;
class BusStop{
private:
string name_bus_stop_;
int x_bus_stop_;
in... | {
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"tags": "c++, reinventing-the-wheel, simulation, gui",
"url": null
} |
I am confused about the distribution of balls. Are all the cases i.e. $\{5,5,0,1\}$ and $\{2,3,4,2\}$ equally likely or not?
• No, those two cases are not equally likely (according to the most straightforward reading of the problem). Each ball is equally likely to be put into any of the four boxes, but it is not equal... | {
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"openwebmath_score": 0.9408015012741089,
"tag... |
c#, winforms, active-directory
private ActiveDirectoryToolBackEnd backEnd;
private Task PrintAllUsers ()=> Task.Run(() =>
{
var users = backEnd.GetUsers();
var filename = backEnd.AllUsersFilename;
backEnd.WriteHeaderToFile(filename, Header.User);
for (int i = 0; i < users.Count;... | {
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biochemistry, software, structural-biology
The Journey Continues!
Poking around with the Toon shaders in Blender, I have found a super easy way to make Goodsell-esque figures!
If you configure your material like so:
You have a shader that will rapidly shade to black at angles far from normal with a lightsource. To ma... | {
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parameter-estimation
The true value of $m$ in green vs various $b/a$ values from @Peter K.'s answer.
The estimates for 100 runs of both estimators. Blue is this estimator, green is the middle quintile of the $b/a$ values.
For this particular run, the variance of this estimator was 0.03013508; the $b/a$ estimator's wa... | {
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2500...3.141192653605793...3.141992493637787...3.141592653589800
2625...3.141973605956924...3.141211846292098...3.141592653589788
2750...3.141229017238178...3.141956157758083...3.141592653589798
2875...3.141940479666230...3.141244948454266...3.141592653589790
3000...3.141259320265719...3.141925875839790...3.14159265358... | {
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"tags": n... |
ros-control
Originally posted by Stefan Kohlbrecher with karma: 24361 on 2016-07-06
This answer was ACCEPTED on the original site
Post score: 0
Original comments
Comment by rohin on 2016-09-30:
Thanks! I found out that I was not setting an initial size to a std::vector which was causing the program to crash. | {
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19. Apr 23, 2016
TSny
No. I would go back to the angular momentum relation and express it in terms of T rather than ω. Then you can easily find an expression for Tf/Ti.
20. Apr 23, 2016
ht9000
ω in terms of T is (Δθ)/T right? I substituted that in place of ω and when I solved for it, it gave me
((r_f)^2 / (r_i)^2)... | {
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"openwebmath_perplexity": 1275.051523101127,
"openwebmath_score": 0.8565937280654907,
"tag... |
visible-light, reflection, matter
Edit: If it does not make sense for matter to have reflection then what about shapes to reflect all light? First, "light" is just the name we give to a small set of frequencies in the electromagnetic waves (and it is sometime extended to neighboors such as UV and IR). -> do you mean r... | {
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"tags": "visible-light, reflection, matter",
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algorithms, proof-techniques
Title: Prove that Big-O is transitive by relation. What does it mean by 'by relation'? Prove $f(n) = O(g(n))$ and $g(n) = O(h(n))$, then $f(n) = O(h(n))$.
The question is
Prove that Big-O is transitive by relation.
What does it mean by by relation?? f(n)=O(g(n)) implies f(n) <= c1*g(n)... | {
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} |
java, beginner, object-oriented, file, git
final private String localRepositoryName = "BerndErnst/Hanabu";
final private String localFileName = "filelinks.txt";
final private String commitMessageFile = "commitmessages.txt";
/** Contains the while(true) loop.
*
* @param args
* Re... | {
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c++
for(int i=0;i<p.size();i++){
int l=b.returnP(i).getL(),w=b.returnP(i).getW(),area=b.returnP(i).getArea(),counter=0;
for(int a=0;a<(array_size-l+3);a++){
for(int b=0;b<(array_size-w+3);b++){
for(int c=0;c<w;c++){
for(int d=0;d<l;d++){
... | {
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c#
if( !rdr.Read() )
throw new NoNextResultException();
ret.Foo = ReadFoo( rdr );
...
}
} catch(NoNextResultException) {
}
Int32 returnValue = (Int32)returnParameter.Value;
switch( returnValue ) {
...
But the problem with that is that throw statements don't define where the exception... | {
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mass, higgs
My current guess is that the Higgs mechanism explains why "other particles" (only fermions, or also other bosons?) have a non-zero rest mass. (I imagine it's some form of explanation for potential energy related to the mere presence of the particle, even in the absence of "interactions" with other particle... | {
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newtonian-mechanics, forces, everyday-life
For the airplane stunt note that the strongman is pulling against the static thrust of the engine. This is significantly less than when the plane is moving through the air, for which the engine is optimised. The static thrust of propellers is typically 50% of the theoretical ... | {
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# Can every positive real be written as the sum of a subsequence of dot dot dot
I answered this thing Infinite sum of prime reciprocals and now wonder what happens if we do not have such a strong condition as Bertrand's postulate. i have been fiddling with this, not sure either way.
Given a sequence $a_1 > a_2 > a_3 ... | {
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I give a geometric derivation, we want to count all integral points lying on surface $|x|+|y|+|z|=P$. Actually in 3D space, in every octant, the shape of surface is triangle shape.
For example, if $P=4$, then the shape in the first octant would be $$\begin{array}[ccccccccc] \ & & & &Q(0,0,4)& & & &\\ & & &D(0,1,3))& &... | {
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"openwebmath_score": 0.9375693798065186,
"tags... |
roslaunch, rosrun
Originally posted by kwc with karma: 12244 on 2012-02-14
This answer was ACCEPTED on the original site
Post score: 2
Original comments
Comment by Mike Gao on 2012-02-14:
Thanks for your reply, but could you tell me which libs of roscpp I can use, or where could I get the related information?
Comment... | {
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c#, parsing
if (pos1 > 0)
{
resultVon = HausnummerBuchst(hausNummer.Substring(0, pos1).Trim());
resultBis = HausnummerBuchst(hausNummer.Substring(pos2, hausNummer.Length - pos2).Trim());
}
else
resultVon = HausnummerBuchst(hausNummer);
List<string> l... | {
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$\log{(y)} = \log{(x^m)} + \log{(k)}$
Now we can combine both logs on the right side (laws of logarithms) :
$\log{(y)} = \log{(k x^m)}$
Good ! Let's exponentiate both sides ! We get !
$y = k x^m$
All right. Now, $k$ makes no sense for us, we only used it to allow exponentiation on both sides. We want $c$, not $k$.... | {
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"openwebmath_score": 0.8503634929656982,
"tag... |
black-hole, gravity, general-relativity, event-horizon
Title: If a photon were 1 Planck length away from the event horizon of a blackhole, would it be able to escape the blackhole's gravitational pull? I understand that one could theoretically replace the sun with a blackhole without affecting the orbits of the planet... | {
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(Maybe convexity plays a role? My last example has a nonconvex feasible region.)
-
See the Monthly article "Do symmetric problems have symmetric solutions?" by William Waterhouse (jstor.org/pss/2975573). – Henry Cohn Mar 17 '11 at 5:27
@Henry: Would you be willing to summarize the main results of that paper as an ans... | {
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"openwebmath_score": 0.8347601890563965,
"tags"... |
and Maclaurin Series We have learned how to construct power series representations of certain functions by relating them to geometric series, either directly, or indirectly through di erentiation or integration. In fact, e−p8(1). This website and its content is subject to our Terms and Conditions. The -th Taylor approx... | {
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"lm_q1_score": 0.9938070091084549,
"lm_q1q2_score": 0.8634461298002867,
"lm_q2_score": 0.8688267660487572,
"openwebmath_perplexity": 390.82097345168205,
"openwebmath_score": 0.9073213934898376,
... |
neural-network, clustering, unsupervised-learning
Title: Using a K-NN Classification Approach for Time Series Data? I have a dataset which contains time-series data of water flow over time. I have a flow meter connected to a kitchen faucet, and I am trying to cluster or classify specific water usage events.
The data ... | {
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"tags": "neural-network, clustering, unsupervised-learning",
"url": null
} |
speed, time-travel
Title: How can time-travel be possible if speed is relative? I have heard that time-travel is possible...relative to some observer.
So, as I understand it, the following example would be accurate:
There are two twins- TwinA and TwinB. Both have very accurate clocks, that are exactly synchronised. Tw... | {
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"openwebmath_score": null,
"tags": "speed, time-travel",
"url": null
} |
arduino, motor, encoding, wiring
Title: Need super-basic help with motor encoder So I have this motor: https://www.servocity.com/23-rpm-hd-premium-planetary-gear-motor-w-encoder
and this motor shield for my arduino uno:
https://www.pololu.com/docs/pdf/0J49/dual_vnh5019_motor_driver_shield.pdf
And no background in elec... | {
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"tags": "arduino, motor, encoding, wiring",
"url": null
} |
relativity, time-dilation
$$ t = \frac{d}{v} $$
Andd even if you are a ray of light this still applies so the time I measure for a ray of light to move a distance $d$ is:
$$ t = \frac{d}{c} $$
So the time I measure for a ray of light to travel the eight light-minutes from the Sun is just eight minutes.
Time dilation m... | {
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"tags": "relativity, time-dilation",
"url": null
} |
javascript, beginner, algorithm, html
The spread operator is a short cut way of turning a array like list into an array. Be wary as IE 11 is still popular and does not support many ES6 features. If you use things like the spread operator you should consider using babel.js so that your code can run on legacy browsers.
... | {
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"tags": "javascript, beginner, algorithm, html",
"url": null
} |
species-identification, botany
The striped structure with a "lid" isn't a trap, but instead an inflorescence (branch bearing multiple flowers — in this case a spadix with its bract being the "trap"). The inflorescences are from the plant with the rounded-arrowhead shaped leaves.
That leaf shape is characteristic of se... | {
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"tags": "species-identification, botany",
"url": null
} |
• This answer also gives an intuitive explanation for the nice result in Byron Schmuland's answer: When the $k$th passenger reaches the plane, there are $n-(k-1)$ empty seats. If the first passenger stands up, he will see that he is in an arbitrary one of $n-k+2$ seats, all of which have looked the same to him so far. ... | {
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"lm_q2_score": 0.84594244507642,
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"openwebmath_score": 0.7296741008758545,
"tags"... |
thermodynamics, entropy
The point of all this is that a closed system is never going to cool to absolute zero because obviously if it's closed heat can't escape from it. However it can attain a state of uniform temperature. So it can attain a state of Heat Death, but only for a subset of commonly used meanings of the ... | {
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"tags": "thermodynamics, entropy",
"url": null
} |
fluid-dynamics, everyday-life, acoustics
5: Distance could be estimates based on a combination of the spectrum and volume level - to disentangle the degeneracy between sound-volume and distance.
6: Perhaps the minimum droplet size is determined by it behaving ballistically (instead of forming a mist)? | {
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"tags": "fluid-dynamics, everyday-life, acoustics",
"url": null
} |
genetics
Title: Do alleles, by definition, code for the same trait? A trait is defined as an inherited characteristic, like eye color and height.
A phenotype is defined as the specific physical manifestation of a trait, like blue eyes and 6 feet, respectively.
Now, genes code for traits. And because alleles are differ... | {
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"id": 6190,
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"tags": "genetics",
"url": null
} |
mathematics
Basically any area of mathematics because we would like to make quantum algorithms to do things more efficiently, regardless of the mathematical field. For example "semi-definite programming" could be added to the list, because quantum algorithms for semi-definite programming is a very active current area ... | {
"domain": "quantumcomputing.stackexchange",
"id": 285,
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"tags": "mathematics",
"url": null
} |
python, keras, cnn, object-detection
name=name)
File "/usr/local/lib/python2.7/dist-packages/tensorflow/python/ops/state_ops.py", line 227, in assign
validate_shape=validate_shape)
File "/usr/local/lib/python2.7/dist-packages/tensorflow/python/ops/gen_state_ops.py", line 66, in assign
use_locking=use_locki... | {
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"tags": "python, keras, cnn, object-detection",
"url": null
} |
electrostatics, electric-fields, capacitance, gauss-law
$$
\frac{1}{r^2+h^2}
$$.
Now, the fraction of this force in the direction of the plane is proportional to a
$$
\frac{h}{\sqrt{r^2+h^2}}
$$
fraction of the total force.
Thus, the force on the point charge in the direction of the plane is
$$
\int_0^\infty \frac{h}... | {
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"tags": "electrostatics, electric-fields, capacitance, gauss-law",
"url": null
} |
reaction-mechanism, halides
Title: Does hydrogen peroxide remove chloramine from water? I know that a small amount of hydrogen peroxide will convert chlorine in drinking water into table salt, oxygen, and water:
$$\ce{NaOCl + H2O2 → NaCl + H2O + O2}$$
What I can't find is what effect it has on chloramine. Does it safe... | {
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"tags": "reaction-mechanism, halides",
"url": null
} |
biochemistry, molecular-biology, coronavirus
The cleavage of spike is crucial to initiate this process because the hydrophobic residues are not accessible/cannot interact with the cell membrane unless the spike has been cleaved. This works to the advantage of the virus, since if the spike is close enough to be cleaved... | {
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"url": null
} |
only if they have the same elements. Here four basic operations are introduced and their properties are discussed. Example − If we take two sets A = { a, b } and B = { 1, 2 }, The Cartesian product of A and B is written as − A × B = { (a, 1), (a, 2), (b, 1), (b, 2)}, The Cartesian product of B and A is written as − B ×... | {
"domain": "slow-wine.net",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
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"lm_q2_score": 0.8539127566694177,
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"openwebmath_score": 0.7289803624153137,
"tag... |
algorithms, data-structures, strings, substrings, suffix-array
Let's have a closer look. Assume the $S[i-1]=xyz$ and $S[i]=xyxyz$. By the above counting method the entry $S[i-1]$ counted the substrings $x,xy$ and $xyz$ and the entry $S[i]$ counted $x,xy,xyx,xyxy,xyxyz$. You will notice that since the prefixes of lengt... | {
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"tags": "algorithms, data-structures, strings, substrings, suffix-array",
"url": null
} |
complexity-theory, search-algorithms
Title: What algorithm should I use to find the closest solution to a given total using a list of integers? My problem is this:
Let's say I have an arbitrary list of integers A[2013, 54, 3, 32 1, 23...]
What is the best strategy to find which of those numbers I should add together t... | {
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"tags": "complexity-theory, search-algorithms",
"url": null
} |
Find an exponential function f(t) = ke at that models this growth, and use it to predict the size of the population at 8:00 PM. The section on Exponential Growth & Decay in Algebra 1 needs some more help. Repeated multiplication is exponents, so the model is y= A0ekt. Unit: Exponential and Logarithmic Functions Section... | {
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"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9773707993078212,
"lm_q1q2_score": 0.8267994285285051,
"lm_q2_score": 0.8459424295406088,
"openwebmath_perplexity": 803.6310114013545,
"openwebmath_score": 0.5381872057914734,
"tags": ... |
microbiology, immunology, virus
Title: Tc and Th1 interaction and viral immune response Tc is T cell which can give T killer cells and T helper cells.
T helper cells (Th1) see the pathogen presented by antigen presenting cells (dendritic cells and macrophages).
They then secrete antigens to kill the pathogen.
If there... | {
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"openwebmath_score": null,
"tags": "microbiology, immunology, virus",
"url": null
} |
ocean, climate-change
Title: Ocean level rising, or the floor getting higher? I randomly had a question pop into my head: "Why are oceans salty, but rivers are not?"
This article seems to provide a plausible explanation: http://oceanservice.noaa.gov/facts/riversnotsalty.html
It basically says:
Rain keeps putting fres... | {
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"openwebmath_score": null,
"tags": "ocean, climate-change",
"url": null
} |
python, combinatorics, complexity
from sys import argv
from itertools import product, chain, groupby
from functools import partial
from multiprocessing import Pool
def indices(width):
for a in range(width):
for b in range(a+1):
yield (b, a)
for b in reversed(range(a)):
yiel... | {
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"tags": "python, combinatorics, complexity",
"url": null
} |
databases
But to avoid duplicate, I would like to use the first_name as a primary key. And I also have a table employee with the column email address that also can be used as a primary key, becuase its unique.
My loss is that I dont know if I should use this approach, becuase its uncommon in practice and maybe it will... | {
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"tags": "databases",
"url": null
} |
machine-learning, neural-network, scikit-learn, mlp, dropout
# early_stopping in partial_fit doesn't make sense
early_stopping = self.early_stopping and not incremental
if early_stopping:
# don't stratify in multilabel classification
should_stratify = is_classifier(self) and sel... | {
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"tags": "machine-learning, neural-network, scikit-learn, mlp, dropout",
"url": null
} |
php, mysql, singleton
static function init($db_type = "", $id){
if(!isset(self::$connections[$db_type])){
self::$connections[$db_type] = new self($db_type, $id);
}
return self::$connections[$db_type];
}
public static function query($query) {
... | {
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"tags": "php, mysql, singleton",
"url": null
} |
About the format of this post: In addition to deriving things mathematically, I will also give Python code alongside it. The idea is that the code will directly follow the math. I often simulate math in order to double check my work and avoid silly mistakes, which is super important when working solo on new stuff. Even... | {
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9830850842553892,
"lm_q1q2_score": 0.8014429048954876,
"lm_q2_score": 0.8152324938410784,
"openwebmath_perplexity": 3523.9865040661116,
"openwebmath_score": 0.7846717238426208,
"tags": nul... |
dynamics
\end{align}
So, you just have to plug in this equation the already calculated $\theta, \,\frac{d\theta}{dt}$ and $\frac{dX_A}{dt} = V_A$.
$$$$
$$$$
OLD VERSION.
Let's simplify things a bit. First, perform the translation:
\begin{align}
&X = \tilde{x} + c \\
&Y = \tilde{y}
\end{align}
Then the equation of the ... | {
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"tags": "dynamics",
"url": null
} |
javascript, html, game, css, collision
function createPlatform() {
if (counter == 0) {
if (2 * Math.round((window.innerHeight / 15) / 2) < player.offsetHeight) {
var newPlatform = document.createElement("DIV");
newPlatform.setAttribute("class", "object platform");
newPlatform.setAttribute("id", "platform");
newPlatfor... | {
"domain": "codereview.stackexchange",
"id": 30865,
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "javascript, html, game, css, collision",
"url": null
} |
gazebo-tutorial
}
Comment by David Jeang on 2013-06-14:
void circle(ros::Publisher turn_command, std_msgs::Float64 degree, bool lr){
turnWheel(turn_command,degree,lr);
ros::Duration(10).sleep();
}void square(ros::Publisher turn_command, std_msgs::Float64 degree, bool lr, int length){
std_msgs::Float64 hand_wheel3;
han... | {
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"tags": "gazebo-tutorial",
"url": null
} |
c++, c++11, compression
std::string Byte::getHexPrintable() const
{
char hexOutput[10];
if (!isTerminator)
sprintf_s(hexOutput, " (0x%02x):\t", c);
else
sprintf_s(hexOutput, " (Term):\t");
return std::string(hexOutput);
}
Here is the struct charCountNode. This class is used in constru... | {
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"tags": "c++, c++11, compression",
"url": null
} |
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