text stringlengths 1 1.11k | source dict |
|---|---|
roboearth, knowrob
Comment by joq on 2013-01-31:
This is really a new question, which should be asked separately. There are already some good answers if you search for "overlay", or just read the doc link I posted above. | {
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lagrangian-formalism, field-theory, complex-numbers, variational-calculus
$\frac{\delta S}{\delta\varphi(x)} = \frac{\delta S}{\delta\chi(x)} = 0$
is equivalent to demanding
$\frac{\delta S}{\delta\phi(x)} = \frac{\delta S}{\delta\phi^\dagger(x)} = 0$.
The Cauchy-Riemann equations would demand that $\frac{\delta S}{\d... | {
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"tags": "lagrangian-formalism, field-theory, complex-numbers, variational-calculus",
"url... |
electromagnetic-radiation, subatomic
Title: Positron and neutron generation from neutron caused by EM radiation As the title says, is the production of a positron and a neutron from a proton by the help of electromagnetic radiation possible? Short-short answer: "No."
Your proposal fails to conserve lepton number, fail... | {
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javascript, dom, react.js
Give your FormWithValidation component state, which stores an array of inputset values (firstname and lastname)
Pass down a this.valueUpdate method, which individual fields can invoke to update state. The method would receive an index (of the input set), a fieldname, and a new value.
Make a s... | {
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c++, integer
std::cout << "\nTheir sum (factorial + fibonacci) is:\n";
std::cout << sum << '\n';
std::cout << "\n\twhich is approximately " << static_cast<long double>(sum);
std::cout << '\n';
std::cout << "\nTheir difference (factorial - fibonacci) is:\n";
std::cout << diff << '\n';
std::cout... | {
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"tags": "c++, integer",
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} |
ros, motion-planning, robot, manipulation
construct the URDF for my robot;
finish the motion planning with the Arm Navigation Warehouse Viewer;
move each joint to a specified position programmically with joint state publisher and robot state publisher.
question: how to fulfill my ultimate goal with all the achievemen... | {
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Control the resolution of a plot by using the MeshDensity option. Increasing MeshDensity can make smoother, more accurate plots, while decreasing it can increase plotting speed.
Divide a figure into two by using subplot. In the first subplot, plot a step function from x = 2.1 to x = 2.15. The plot's resolution is too ... | {
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• a forest with v vertices has at most v-1 edges
### Complexity
DFS, BSF complexity of a tree: O(v) reduced from O(v+e) unlike graph
## Spanning Tree
### Binary Search Tree
BST: a tree where every vertex has at most 3 edges
• two children, one parent
• ordering invariant
• root = any vertex with at most 2 edges... | {
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"lm_q1_score": 0.9845754456551736,
"lm_q1q2_score": 0.8204709286914471,
"lm_q2_score": 0.8333245891029456,
"openwebmath_perplexity": 4896.516259343741,
"openwebmath_score": 0.6874227523803711,
"tags": n... |
star, space, atmospheric-effects
And then there are several effects harmful to astronomy:
1. Seeing
What we call in astronomy "seeing" is just air turbulence. Because air moves around due to heat, it distorts the image continuously. This is how the Moon looks like in a telescope - notice the shifting around due to see... | {
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The options were $(a)\quad1\quad (b)\quad2\quad (c)\quad3\quad (d)\quad 4$
• @heather No calculators. Sep 18, 2016 at 12:04
• I doubt that you can make use of the multiple-choice nature of the question, since almost all possible answers are present in the options. Sep 18, 2016 at 12:05
• Your best best is to use Ferma... | {
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"ta... |
Number Theory
Algebra
AIME, 2012, Question 1.
Elementary Number Theory by David Burton .
## Try with Hints
Here a number divisible by 4 if a units with tens place digit is divisible by 4
Then case 1 for 10b+a and for 10b+c gives 0(mod4) with a pair of a and c for every b
[ since abc and cba divisible by 4 only w... | {
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"lm_q2_score": 0.8774767954920548,
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"openwebmath_score": 0.6250997185707092,
"tags": n... |
python, datetime
Solutions that require comparison to the previous element are easily implemented using the zip function:
# This will print '(4, 8), (8, 15), (15, 16), (16, 23), (23, 42)'
my_numbers = [4, 8, 15, 16, 23, 42]
for group in zip(my_numbers[:-1], my_numbers[1:]):
print group
Using this function saves y... | {
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operating-systems
If the source of the signal is within current process, then it is synchronous because it is handled immediately and the OS sends interrupt to the process. Asynchronous is when external tool sends signal to process, for example using kill tool or Ctrl+C and so on. ref
"Waiting for receiver" does not ... | {
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ros, ros-melodic
[ INFO] [1657117747.571474109]: IK Using joint link_5 -2.0944 2.0944
[ INFO] [1657117747.571481899]: IK Using joint link_6 -6.2832 6.2832
[ INFO] [1657117747.571499370]: Looking in common namespaces for param name: manipulator/position_only_ik
[ INFO] [1657117747.572508959]: Looking in common namespac... | {
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"tags": "ros, ros-melodic",
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} |
java, beginner, homework, finance
System.out.println("At what intrest rate is the intrest compounded annually?");
double intrestRate = scanner.nextDouble();
double futureValueFive = investment * Math.pow(1 + intrestRate, 5.);
System.out.println("In five years the investment will be worth : " +... | {
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"tags": "java, beginner, homework, finance",
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} |
fluid-dynamics, pressure, medical-physics
Back to the unknown losses. We might be able to come up with an estimate for them using the information at P3 and P4. We know:
$$ P_{0,P4} = P4 + \frac{1}{2} \rho V_{P4}^2 + \rho g h_{P4} $$
and we also know that:
$$ P_{0,P3} = P3 + \frac{1}{2} \rho V_{P3}^2 + \rho g h_{P3} $$... | {
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$\displaystlye= (y - \frac{1}{2})^2 - \frac{5}{4} = 0$
$y = \frac{1}{2}(1 - \sqrt{5})$
$y = \frac{1}{2}(1 + \sqrt{5})$
Resubstituting $y$ for $e^x$:
$e^x = \frac{1}{2}(1 + \sqrt{5})$
$\ln e^x = \ln \frac{1}{2}(1 + \sqrt{5})$
$x = \ln \frac{1}{2}(1 + \sqrt{5})$
OR
$e^x = \ln \frac{1}{2}(1 - \sqrt{5})$
$\ln e^x ... | {
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... |
The sine abbreviated "sin" and cosine "cos" are the two most prominent trigonometric functions. All other trig functions can be expressed in terms of them. In fact, the sine and cosine functions are closely related and can be expressed in terms of each other. tanx y = tan x tan y / 1 tan x tan y sin2x = 2 sin x cos x. ... | {
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9790357628519819,
"lm_q1q2_score": 0.8004346553402798,
"lm_q2_score": 0.8175744806385542,
"openwebmath_perplexity": 6221.733409496773,
"openwebmath_score": 0.851767897605896,
"tags": nul... |
spectroscopy, absorption, infrared-radiation, climate-science
The graph below shows the new absorbance $A'$ (vertical axis) as a function of the old absorbance $A$ (horizontal axis). The fact that the slope of the graph becomes infinite as $A \to 1$ reflects the idea that it really matters how close to 100% absorbanc... | {
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"tags": "spectroscopy, absorption, infrared-radiation, climate-science",
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} |
ros-fuerte, roscore
Original comments
Comment by Eric Perko on 2012-05-17:
What OS are you on? Did you install from .debs? Have you tried with just doing "source /opt/ros/fuerte/setup.bash"... you shouldn't need to set the rest of those variables just to get a roscore to start (and things like ROS_ROOT, PYTHONPATH, et... | {
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# Generate a data set with a given correlation coefficient
Recently, I found myself needing to create scatterplots that represented specific values for the correlation coefficient r. This was for a writing project, but it is something that has come up with teaching as well. Showing students scatterplots for many diffe... | {
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"lm_q1_score": 0.9916842225056003,
"lm_q1q2_score": 0.8368774605997831,
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"openwebmath_perplexity": 681.4965363218902,
"openwebmath_score": 0.7005283236503601,
"t... |
c++, multithreading, thread-safety, locking
If the writeOnly string is not empty, we swap the writeOnly and readOnly strings: that's how the sink gets hold of the data written by the log source.
Now we're done with the log source - we can unlock its state.
The rest of the per-source work is done without holding lock... | {
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"tags": "c++, multithreading, thread-safety, locking",
"url": null
} |
quantum-mechanics, electromagnetism, general-relativity, black-holes
Does a constantly accelerating charged particle emit EM radiation or not?
It emits light, because it "stirs up" the electromagnetic field. To understand this, just dip your finger into a still pond and move it in a circle. Water waves will emanate f... | {
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"tags": "quantum-mechanics, electromagnetism, general-relativity, black-holes",
"url": nu... |
mineralogy, minerals, crystals, crystallography
Title: Why does the colour of amethyst fade if exposed to too much light? It is well known that the purple hue that is characteristic of the amethyst quartz ($\ce{SiO2}$) will fade if the crystal is exposed to light for a prolonged period of time. What is the underlying... | {
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"tags": "mineralogy, minerals, crystals, crystallography",
"url": null
} |
graphs
Following Füredi's footsteps, we can generalize the upper bound to the directed case. Denote by $P_2$ a path consisting of two directed edges pointing at the central cases. The number of copies of $P_2$ in your graph is at most $k \binom{n}{2}$, since for every choice of the outer vertices there are at most $k$... | {
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"openwebmath_score": null,
"tags": "graphs",
"url": null
} |
javascript, html
</div>
<a href="#" onclick="toggle_visibility('fourthDivResults');"> <div id="fourthDivHeader">
Fourth Div
</div>
</a> | {
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earthquakes, plate-tectonics, volcanoes, tectonics
in tectonic style, which give rise to differences in volcanism and earthquake occurance and motion. The figure in this section of the Geology of New Zealand Wikipedia page shows the variations of displacement vector (direction and magnitude of motion) along the length... | {
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"tags": "earthquakes, plate-tectonics, volcanoes, tectonics",
"url": null
} |
javascript, array
if (matrixWidth <= 7 && matrixHeight <= 7) {
matrixB = new Array(matrixHeight);
for (i = 0; i < matrixB.length; i++) {
matrixB[i] = new Array(matrixWidth);
}
for (i = 0; i < matrixB.length; i++) {
htmlElements += "<div>";
for (j = 0;... | {
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"tags": "javascript, array",
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} |
is the probability of rolling a 6 at least once?" The correct answer is 91/216. Here are a few examples that show off Troll's dice roll language: Roll 3 6-sided dice and sum them: sum 3d6. 5+6 " or " 6+5 Therefore of the 36 possible outcomes there are 3 that do not meet the requirement of being less than 11. Determine ... | {
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"lm_q1_score": 0.9766692339078751,
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"lm_q2_score": 0.8670357718273068,
"openwebmath_perplexity": 260.607987939569,
"openwebmath_score": 0.6550420522689819,
"ta... |
elements, erratum
Title: Is there a case when an atom of some element (e.g. carbon) does not have its expected number of protons (e.g. 6)? Page 12 of the Study Guide for Campbell Biology, 11th Edition has the following question:
A carbon atom has 6 neutrons. How many protons are present in the nucleus of a carbon ato... | {
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"tags": "elements, erratum",
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} |
gazebo, ros-melodic, ros-noetic, realsense
ROS path [12]=/home/cs/ari_public_ws/src/ari_navigation/ari_navigation
ROS path [13]=/home/cs/ari_public_ws/src/ari_navigation/ari_rgbd_sensors
ROS path [14]=/home/cs/ari_public_ws/src/ari_robot/ari_robot
ROS path [15]=/home/cs/ari_public_ws/src/ari_simulation/ari_simulation
... | {
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"tags": "gazebo, ros-melodic, ros-noetic, realsense",
"url": null
} |
physical-chemistry, mole
Title: Basis of mole concept? We all have read that 1 mole of any substance contains $6.022 \times10^{23}$ atoms included in the substance. And:
$$Mole=\frac{weight}{molar\,\,mass}$$
Where molar mass is gram atomic mass such that when the atomic mass of the element (expressed in unified mass) ... | {
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"tags": "physical-chemistry, mole",
"url": null
} |
ruby, http, web-scraping
proxy_ip, proxy_port = proxy.split(':')
mechanize.set_proxy(proxy_ip, proxy_port)
mechanize
end
end
...
class WebCrawler
def initialize(agent = MechanizeFactory.get)
@agent = agent
end
def fetch_images(blog)
page = @agent.get(get_blog_uri(blog))
extract_images_f... | {
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} |
waves, acoustics, string
$y_{tt} + c\nabla^2y=0$
for boundary $\bf{B}$ such that $\bf{B}$ is a closed loop (such as a circle): $y(t,\textbf{B})=0$
for initial condition $y(0,\textbf{x})=f(\textbf{x})$, $f(\textbf{x})=0$ | {
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"tags": "waves, acoustics, string",
"url": null
} |
cosmology, cosmic-microwave-background
And what if we wanted to work forward in time instead? Is it possible to connect any CMB anisotrophies to structures eventually emerging from Dark Ages in that spot on the sky?
(*) In this question I ignore any other particles emitted during the recombination epoch and detected ... | {
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"tags": "cosmology, cosmic-microwave-background",
"url": null
} |
ros2
This file may be generated manually, but do you manage to include all the visualization packages without the ros_core?
ros_core doesn't include any UI-based packages, and that's on purpose.
Or are you asking how to download the sources for all UI-based packages that are not in ros_core, but without also download... | {
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} |
quantum-mechanics, thermodynamics, energy, energy-conservation
Now, what if $U$ is not equal to any of the possible eigenvalues $E$ in (3)? As pointed out in a comment by the OP, this can occur if the system is restricted to a finite volume, in which case the particles' momenta (and therefore the total energy) are re... | {
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"tags": "quantum-mechanics, thermodynamics, energy, energy-conservation",
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} |
java, algorithm, tree, data-mining
if (number > this.lotteryConfiguration.getMaximumNumberValue()) {
throw new IllegalArgumentException(
"number (" + number + ") > " +
"this.lotteryConfiguration.getMaximumNumberValue()[" +
this.lotteryConfiguration.getMaximum... | {
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"tags": "java, algorithm, tree, data-mining",
"url": null
} |
qiskit, gate-synthesis
0 & 0 & 1 & 0 & 0 & 0 & 0 & 0\\
0 & 0 & 0 & 1 & 0 & 0 & 0 & 0\\
0 & 0 & 0 & 0 & 1 & 0 & 0 & 0\\
0 & 0 & 0 & 0 & 0 & 1 & 0 & 0\\
1 & 0 & 0 & 0 & 0 & 0 & 0 & 0\\
0 & 0 & 0 & 0 & 0 & 0 & 0 & 1\\
}=?
$$
I tried to decompose the unitaries hamiltonian $U=\exp(-i\pi $$H$$)$ in the Zeeman basis, but it ... | {
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"tags": "qiskit, gate-synthesis",
"url": null
} |
transform
Title: cannot find package named tf
I am using ros-indigo-base version, using ubuntu 14.2 getting error: cannot find package named tf. I have installed it but still can not import it in .py file. What should i do?
Originally posted by swati shirke on ROS Answers with karma: 1 on 2016-08-12
Post score: 0
I... | {
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"tags": "transform",
"url": null
} |
condensed-matter, solid-state-physics, electronic-band-theory
Title: Are electronic wavefunctions in band gap insulators localized? is a single-particle picture sufficient in this case? I am having trouble understanding the physics of band gap insulators.
Usually in undergrad solid state physics one looks at non-inter... | {
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"tags": "condensed-matter, solid-state-physics, electronic-band-theory",
"url": null
} |
programming, quantum-algorithms
Title: Quantum Computing Daily Practice / Quiz platform I am looking for a platform where I can solve quizzes and programming / algorithmic challenges related to quantum computation and information.
To be more specific, I am looking for a platform that is analogous to LeetCode, Codeforc... | {
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"tags": "programming, quantum-algorithms",
"url": null
} |
c, strings
OP had while (p >= str && *p != ' ')
while (p >= str && ! isspace(*p))
--p;
return p - str + 1; // To compensate for this being the index prior to the word.
}
Needs buffer overlap validation -- passed a dest pointer between src+1 and the last character in the first word of src, this will l... | {
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"tags": "c, strings",
"url": null
} |
fft, cross-correlation
Lets say I have two groups of overlapping periodical spikes in my data, one with a period of 8 seconds and another with 6. I have zeroed the data except for the times where there is spikes. So, my data now looks like a train of spikes. How can I find the periodicity of the two and separate the t... | {
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"openwebmath_score": null,
"tags": "fft, cross-correlation",
"url": null
} |
quantum-mechanics, hilbert-space, quantum-entanglement, density-operator
Title: Entanglement and density matrices Suppose I have a system composed of two subsystems (each is a 2-state system).
Let $$|\psi\rangle = \frac{1}{\sqrt{2}}(|0\rangle_A \otimes |1\rangle_B - |0\rangle_B \otimes |1\rangle_A)$$ be an entangled s... | {
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"url"... |
and logarithmic functions). Example 5 Find using logarithmic differentiation. It is relevant in problems of physics and has number theoretic significance. A continuous random variable. 1 Integral. TRIGONOMETRIC FUNCTIONS WITH eax (95)!exsinxdx= 1 2 ex[sinx"cosx] (96)!ebxsin(ax)dx= 1 b2+a2 ebx[bsinax"acosax] (97)!excosx... | {
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"id": null,
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.992988205448513,
"lm_q1q2_score": 0.8047959925287891,
"lm_q2_score": 0.8104789040926008,
"openwebmath_perplexity": 868.1644793955845,
"openwebmath_score": 0.8654050230979919,
"tags": n... |
quantum-mechanics, hilbert-space, operators, notation
To answer the second question, consider a bipartite Hilbert space $\mathscr{H} \equiv \mathscr{H}_1 \otimes \mathscr{H}_2$ and let $o_1$ and $o_2$ denote operators on $\mathscr{H}_1$ and $\mathscr{H}_2$, respectively. We then can define the action of $o_1$ and $o_2... | {
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"tags": "quantum-mechanics, hilbert-space, operators, notation",
"url": null
} |
clojure, clojurescript
; Spec for the whole db
(s/def ::db (s/keys :req-un [::peoples ::filters]))
;; -- Data --
;; --------
(def peoples [
{::name "julien"
::date-fin-mandat (js/Date.)
::role :dev}
{::name "juscellino"
::date-fin-mandat (js... | {
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. . Hence: . $\begin{array}{ccc}x &=& \text{-}1 - 2z \\ y &=& \frac{3}{2} + \frac{1}{2}x \\ z &=& z\end{array}$
On the right, replace $z$ with a parameter $t.$
. . . $\begin{Bmatrix}x &=& \text{-}1-2t \\ y &=& \frac{3}{2} + \frac{1}{3}t \\ z &=& t \end{Bmatrix}$
These parametric equations represent the infinitely ma... | {
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"openwebmath_score": 0.8381856083869934,
"tags... |
special-relativity, speed-of-light, inertial-frames
so widely and quickly? Or did they in fact have physical phenomenon which special relativity and only special relativity seemed to explain? Special Relativity was not widely accepted until long after it was first published as people believed it to be too much of a ch... | {
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"tags": "special-relativity, speed-of-light, inertial-frames",
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filters
So, really, don't code your own vocoder – that's not only hard to do well, it also simply requires a lot of time-intense testing to tune it just right for voice; that is something others have done for you. | {
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• Cool, that's what I thought! Thanks so much. Glad that my understanding wasn't totally off. Also, I notice that my post just got reformatted to look a lot nicer. Is this automated, or did some kind of moderator go and do that by hand? – Chris N-L Feb 20 at 23:19
• People can propose edits, and with enough reputation ... | {
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"openwebmath_score": 0.817223310470581,
"tag... |
electrochemistry, hydrogen
Title: Why do batteries specifically vent *hydrogen* in the event of abuse? When a battery is subject to overcharging or overdischarging (including attempts to recharge a primary cell), it may vent hydrogen. It seems that every type of electrochemical battery I've read about or used specifi... | {
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"tags": "electrochemistry, hydrogen",
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Let's take a look at an example.
Suppose $m=n=2$ and $a=\begin{pmatrix}2&0\\0&2\end{pmatrix}$.
We find it's eigenvalues and eigenvectors by solving $av=\lambda v$ with $v\in \mathbb K^m$.
What are the eigenvalues and eigenvectors of $a$?
Can we solve $\mu_a(c)=ac=\lambda c$ with $c\in \mathbb{K}^{m\times n}$ as well ... | {
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"openwebmath_perplexity": 190.4953599076671,
"openwebmath_score": 0.9813327789306641,
"ta... |
php, algorithm, iterator, laravel
$templateTarType = $this->templateConfig->getTemplateTargetType();
$date = date('Y-m-d',strtotime('-' . $periodInWeeks . 'weeks')) . '00:00:00';
$sql = "SELECT max(SML_AccessTimestamp) as 'timestamp_check' from gaig_users.sent_email where SML_UserId = ? and SML_ProjectName = ?... | {
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"tags": "php, algorithm, iterator, laravel",
"url": null
} |
7. Mar 10, 2008
### HallsofIvy
Staff Emeritus
Well, I, not having a TI89 calculator at hand, would have to do the integral by hand (Poor me!).
$$\int \frac{1}{cos x}dx= \int \frac{cos x}{cos^2 x} dx= \int \frac{cos x}{1- sin^2x}dx$$
Letting u= sin(x), du= dx, the integral becomes
$$\int \frac{du}{1- u^2}= \frac{1}{2... | {
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"openwebmath_score": 0.8449708223342896,
"tag... |
c k i f i t ′ s c o r r e c t. In this section we will introduce the concept of eigenvalues and eigenvectors of a matrix. ©n d2h0 f192 b WKXuTt ka1 pS uo cfgt Nw2awrte e 4L YLJC f. To find the kernel of a matrix A is the same as to solve the system AX = 0, and one usually does this by putting A in rref. Before finding ... | {
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"lm_q1_score": 0.9825575127099971,
"lm_q1q2_score": 0.8010128158396357,
"lm_q2_score": 0.8152324983301568,
"openwebmath_perplexity": 380.7746557546349,
"openwebmath_score": 0.7201289534568787,
"tags": ... |
models, comparison, implementation
AI has always been a battle between the 'neats and the scruffies'. Neats tend to prefer working 'top down' from clean abstractions, 'scruffies' like to work 'bottom up', and 'bang the bits' of the implementation together, to see what happens.
Of course, in practice, interplay between... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "models, comparison, implementation",
"url": null
} |
orbital-motion, reference-frames, space
Title: What would happen to a rocket car in a torus-shaped spaceship that encompasses the earth? Suppose we built a enormous torus shaped space station that encompasses and leaves about 330 kilometers between it and the earth. So it's radius is about 6,371 kilometers . Obviously... | {
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"tags": "orbital-motion, reference-frames, space",
"url": null
} |
quantum-mechanics, wavefunction, hydrogen
Results
After the calculations described above we get a finite expansion of our wave packet in hydrogen-like eigenfunctions:
$$\operatorname{packet}(r,\theta,\phi,t)=\sum\limits_{m=1000}^{1170}e^{im\phi}\Phi_m\sum\limits_{l=m}^{m+7}Y_{l,m}(\theta,0)\Theta_{l,m}\sum\limits_{n=1... | {
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"openwebmath_score": null,
"tags": "quantum-mechanics, wavefunction, hydrogen",
"url": null
} |
temperature, plasma-physics
Some of these instabilities are very good at transferring energy between the ions and electrons (e.g., lower-hybrid drift, ion-acoustic, whistler-types, etc.). These types of instabilities can lead to situations where $T_{i} \approx T_{e}$ (However, as I stated above, if the plasma is not ... | {
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"tags": "temperature, plasma-physics",
"url": null
} |
newtonian-mechanics, angular-momentum, rotational-dynamics, rotational-kinematics, angular-velocity
Title: Angular momentum - Equation of Motion for 2D rigid dynamics So I'm doing my best to define Equations of Motion for my 2D model of a rocket (plain cylinder). And I am stuck at the equation for deriving differentia... | {
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"tags": "newtonian-mechanics, angular-momentum, rotational-dynamics, rotational-kinematics,... |
organic-chemistry, acid-base, phenols, nitro-compounds
Title: Why is picric acid more acidic than carbonic acid? I just had a question in a test asking to compare the relative acidity of picric acid (TNP) and carbonic acid, $\ce{H2CO3}$ (not phenol). It turns out that TNP is more acidic. I have no idea why? Is there s... | {
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"openwebmath_score": null,
"tags": "organic-chemistry, acid-base, phenols, nitro-compounds",
"url": null
} |
gazebo, urdf
Title: How to add a torque sensor to a 4-wheeled robot?
Can someone point me in the right direction as to how to add torque sensors (or get torque feedback) to each wheel of a robot?
Originally posted by jimmycuff on ROS Answers with karma: 58 on 2011-12-13
Post score: 0
Give this file a look. It is a ... | {
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} |
ros-kinetic, ubuntu, ubuntu-xenial
E: Failed to fetch http://us.archive.ubuntu.com/ubuntu/pool/main/m/mir/libmircookie-dev_0.26.3+16.04.20170605-0ubuntu1_amd64.deb 404 Not Found [IP: 91.189.91.23 80]
E: Failed to fetch http://us.archive.ubuntu.com/ubuntu/pool/main/m/mir/libmirclient-dev_0.26.3+16.04.20170605-0ubuntu... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "ros-kinetic, ubuntu, ubuntu-xenial",
"url": null
} |
homework-and-exercises, thermodynamics, phase-transition
My final thought is that, since the vapour pressure of sodium chloride at 20 deg C is sensibly zero, there is no sodium chloride in the vapour phase and so no sodium chloride can move from the left to the right arm. Consequently $\Delta N_{s}^{L}=0$ and the last... | {
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"openwebmath_score": null,
"tags": "homework-and-exercises, thermodynamics, phase-transition",
"url": null
} |
cc.complexity-theory, graph-theory, graph-isomorphism, bounded-degree
Title: Complexity of finding if a degree bounded graph H is a subgraph of an unbounded graph G You are given two graphs G and H , and want to know if H is a subgraph of G.
You know that H has a max vertex degree K (constant integer).
What can you sa... | {
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"tags": "cc.complexity-theory, graph-theory, graph-isomorphism, bounded-degree",
"url": n... |
python, python-3.x, object-oriented, meta-programming
def get_function_code(method_name):
"""
Gets all the code in the method name passed
"""
global function_params
code = []
lines = get_file_lines()
for i in range(len(lines)):
if method_name in lines[i]:
for j in range(... | {
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"tags": "python, python-3.x, object-oriented, meta-programming",
"url": null
} |
ds.algorithms, graph-theory, graph-algorithms, treewidth
Title: Typical hardness of tree decomposition? Tree decomposition is hard in the worst case but greedy method seems to be near-optimal on small real-life networks.
Is anything known about hardness of tree decomposition of a "typical" instance of some class of g... | {
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"tags": "ds.algorithms, graph-theory, graph-algorithms, treewidth",
"url": null
} |
c#, converting
Title: Program for importing autotask contracts into dynamics CRM 2011 We regularly have to convert a bunch of autotask Contracts to a custom CRM entity because we have employees who don't work in Autotask but need those contracts. I wrote the above code to handle this job. this code is supposed to run ... | {
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"openwebmath_score": null,
"tags": "c#, converting",
"url": null
} |
optics, quantum-optics
The Wikipedia article on shot noise in optics reflects this relationship, using "$\propto$" rather than "$=$" but does not explain why.
Why is this? If photon shot noise is poisson distributed, why isn't the variance equal to the mean? I suspect the answer has something to do with the area of my... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "optics, quantum-optics",
"url": null
} |
# Math
The circumference of a circle varies directly from its diameter. If the circumference of the circle having a diameter of 7cm is 7 cm, what is the circumferences of the circle whose diameter is 10cm? 18cm? 20cm?
a. Write a mathematical statement that relate two quantities involved in the problem
b. What is the c... | {
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"openwebmath_perplexity": 731.5636781875177,
"openwebmath_score": 0.8825789093971252,
"tags":... |
c#, beginner, array, random, winforms
Title: Function that loads a random image using an array of paths to images I have created a program that generates a random image from a folder of all the world's flags. First, it generates an image as it loads, then it can keep randomizing the shown image if the user clicks on a... | {
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"tags": "c#, beginner, array, random, winforms",
"url": null
} |
homework-and-exercises, interference
${ \Upsilon }_{ N }={ \left[ \left( N-\frac { 1 }{ 2 } \right) \lambda R \right] }^{ { 1 }/{ 2 } }$
Making a ratio using the information you provided, I get:
$\frac { 1.50 }{ 1.31 } =\frac { { \left[ \left( 10-\frac { 1 }{ 2 } \right) \lambda R \right] }^{ { 1 }/{ 2 } } }{ { \... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "homework-and-exercises, interference",
"url": null
} |
converting, vba, csv, excel
Dim CSVFolder As Variant 'must be a variant in order to loop over a string collection
For Each CSVFolder In folders
TransformFile rootFolder & CSVFolder & "\"
Next
Application.ScreenUpdating = True
End Sub
Private Sub TransformFile(ByVal CSVFolder As String)
Dim fi... | {
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"tags": "converting, vba, csv, excel",
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722 944 0 0 0 0 0 0 0 0 0 444 500 444 500 444 333 500 500 278 0 500 278 778 500 500 500 500 333 389 278 500 500 722 500 500 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 333 0 0 0 500 ] /Encoding /WinAnsiEncoding /BaseFont /TimesNewRoman /FontDescriptor 113 0 R >> endobj 118 0 obj << /Type /FontDescriptor /Ascent 891... | {
"domain": "statesindex.org",
"id": null,
"lm_label": "1. Yes\n2. Yes\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9715639636617015,
"lm_q1q2_score": 0.8277266356549429,
"lm_q2_score": 0.8519527963298947,
"openwebmath_perplexity": 5287.249423826645,
"openwebmath_score": 0.4615281820297241,
"t... |
quantum-field-theory, path-integral, fermions, grassmann-numbers
Title: Grassmann's variables under integration If $\eta$ is a Grassmann variable, due to invariance under translations we get that,
$$\int d\eta\ \eta = 1 \tag1$$
Nevertheless, for being Grassmann's, $\eta$ satisfies $\eta^2 = 0$. Differentiating this c... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "quantum-field-theory, path-integral, fermions, grassmann-numbers",
"url": null
} |
cell, action-potential
where one "rung" of your resistor ladder has $r_m$ broken out into the 2 components and drawn differently. | {
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"url": null
} |
• But my book defines $B_2=j(A_1-A_2)$ so how does that suddenly become real? Or is that term just dropped completely (if the initial conditions are real)? Sep 8, 2016 at 4:32
• If you fit two real initial conditions to the first form, you will find that $A_1, A_2$ would takes on the values of complex numbers. You will... | {
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"id": null,
"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9603611620335328,
"lm_q1q2_score": 0.8458833083276001,
"lm_q2_score": 0.8807970811069351,
"openwebmath_perplexity": 256.8650872879889,
"openwebmath_score": 0.8286468386650085,
"tag... |
radioactivity, isotopes
Title: Where does the tritium on the Earth come from? As tritium has smaller lifetime than the life of the Universe, it should have decayed before the present age completely. How can the presence of natural tritium be explained in that case? Wikipedia says that the half-life of tritium is 12.32... | {
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"openwebmath_score": null,
"tags": "radioactivity, isotopes",
"url": null
} |
performance, vba, vbscript, ms-word
Set objDoc = ActiveDocument ' Because we run inside of word as macro
''''''''''''''''''''''''''''''''''''''''''''''''''
Const MAX = 200 ' using fixed sized arrays, mod this if you'll have more than 200 entries.
Dim vulnerabilityArr(MAX) ' initializing the arrays
Dim severityArr(MAX... | {
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"tags": "performance, vba, vbscript, ms-word",
"url": null
} |
f#, ascii-art, fractals
The problem states that the output consists of 63 rows and 100 columns, and that the number of iterations is read from standard input. The length of the root (and each branch) of the first iteration is 16, and halves with each iteration.
let translateBy x0 y0 = Seq.map (fun (x, y) -> (x + x0, y... | {
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"openwebmath_score": null,
"tags": "f#, ascii-art, fractals",
"url": null
} |
species-identification, botany
3 Leaves velvety puberulent (sometimes becoming glabrate in age), the apex and the lobes (if present) generally obtuse to broadly acute; drupes pubescent (becoming glabrate); plant a stoloniferous shrub; [of dry habitats, especially sandhills] ............. T. pubescens
2 Fruits glabr... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "species-identification, botany",
"url": null
} |
c#, game, winforms
buttons[12].Parent = this;
buttons[12].Location = new Point(140, 140);
buttons[12].Size = new Size(60, 60);
buttons[12].Click += new EventHandler(button13click);
buttons[13].Parent = this;
buttons[13].Location = new Point(200, 140);
... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c#, game, winforms",
"url": null
} |
string-theory, cosmology, research-level, cosmological-constant, string-theory-landscape
Also, how to compare stability of vacua with different number of large dimensions? Comparing cosmological constants doesn't feel to make sense. OK, I will bite on this one.
Suppose you have a quantum mechanical model with a metast... | {
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"openwebmath_score": null,
"tags": "string-theory, cosmology, research-level, cosmological-constant, string-theory-land... |
python, python-3.x, console, unix
Here is my code:
import argparse, shutil, sys
import itertools
import os, os.path
import string, glob, re
if __name__ == '__main__':
parser = argparse.ArgumentParser(description='concatenate files and print on the standard output')
parser.add_argument('filenames', nargs='+'... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python, python-3.x, console, unix",
"url": null
} |
c++, game
outfile << "Room:" << endl;
outfile << "13 4" << endl;
outfile << "cave_branch" << endl;
outfile << "Here the tunnel heads west, a small crack in the wall leads east, in front of you there is a chute high above the ground, under which is a pile of straw." << endl;
outfile << "straw" << endl;
... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c++, game",
"url": null
} |
c, sliding-tile-puzzle
board[ space[0] ][ space[1] + 1 ] = 0;
board[ space[0] ][ space[1] ] = tile;
space[1]++;
return true;
//check the tile to the right of the space tile so we can swap the space tile with the tile the user selected
}else if ( board[ space[0] ][ space[1] - 1] == tile ) {
boar... | {
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"openwebmath_score": null,
"tags": "c, sliding-tile-puzzle",
"url": null
} |
(... has been slightly edited.)
#### Attachments
4.7 KB · Views: 569
Last edited:
fresh_42
Mentor
2021 Award
Forgive me for being lazy, but the following seems to be the matrix for which @zak100 is to find eigenvectors
View attachment 230735 from his pdf.
Then for the eigenvalue λ = −4, we have ##\ (A - 4 I )= \begi... | {
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"lm_q1q2_score": 0.8135491472981691,
"lm_q2_score": 0.8418256532040708,
"openwebmath_perplexity": 753.3576400220351,
"openwebmath_score": 0.8908528089523315,
"tag... |
human-biology, endocrinology
Smoking now disturbs this balance by inhibiting fibrinolysis and promoting the accumulation of fibrin and pushes it more to the site of coagulation. What causes the problem here is the elevation of clotting factors in combination with the disturbance of the balance between activation and i... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "human-biology, endocrinology",
"url": null
} |
interstellar-medium
Title: Can circumstances exist such that as seen from some solar system all stars are obscured? I am mostly active on Physics Stack Exchange but a question occurred to me that I think is best submitted here.
This question is about a thought experiment: whether the circumstances of the intended thou... | {
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"tags": "interstellar-medium",
"url": null
} |
$$\fitch{ \neg A\wedge\neg B }{ \neg A \\ \fitch{ A }{ \bot \\ B } \\ A\to B }$$
This one usually causes new students to go "what.". It seems rather bizarre to assume something contrary to a premise in order to utilise the principle of explosion to conclude something contrary to the other premise, and therefore dedu... | {
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"lm_q1q2_score": 0.8292122598595731,
"lm_q2_score": 0.849971181358171,
"openwebmath_perplexity": 1513.117037407659,
"openwebmath_score": 0.8036571145057678,
"tags... |
newtonian-mechanics, classical-mechanics, forces
First, is Newton's Third Law not universally true? It was my understanding the the Third Law was a necessary consequence of the homogeneity of space, and conservation of momentum.
Second, what would be a familiar example of a non-relativistic force that does not follow... | {
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"tags": "newtonian-mechanics, classical-mechanics, forces",
"url": null
} |
python, beginner, number-guessing-game
Title: "Number guessing game" in Python I am new to Python and I have tried to come up with a code for the number guessing game. But I am pretty sure this is not the right way to do it. I am able to get the right output, however, my code is pretty long. Any ideas on using a diffe... | {
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"tags": "python, beginner, number-guessing-game",
"url": null
} |
quantum-state, quantum-fourier-transform, quantum-phase-estimation, phase-kickback
So, could someone please explain why exactly the state of the first register of qubits changes, even when it simply acts as a "control" for the second register? Is it just a mathematical convenience or is there something deeper? Imagin... | {
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"tags": "quantum-state, quantum-fourier-transform, quantum-phase-estimation, phase-k... |
c#, performance, asp.net-core, entity-framework-core
public int Rtnsindx { get; set; }
[Column("INUSINDX")]
public int Inusindx { get; set; }
[Column("INSRINDX")]
public int Insrindx { get; set; }
[Column("DMGDINDX")]
public int Dmgdindx { get; set; }
[Required]
[Column("ITMTSHID")]
... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "c#, performance, asp.net-core, entity-framework-core",
"url": null
} |
inorganic-chemistry, metallurgy
Title: Lead's affinity for oxygen in the cupellation refining process My inorganic chemistry textbook1 says:
Cupellation is a process, where crude gold is taken in a small bowl called cupell and melted in the presence of air. Due to high oxygen affinity of $\ce{Pb}$, it is converted to... | {
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"tags": "inorganic-chemistry, metallurgy",
"url": null
} |
discrete-signals, reference-request, information-theory, random
So, I would like to know if there is a proof or material from which it can be inferred if the entropy of characters is lesser/ greater or same with the entropy of real numbers.
Q2: I want to know why symbols are used in coding and other applications such... | {
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"openwebmath_score": null,
"tags": "discrete-signals, reference-request, information-theory, random",
"url": null
} |
quantum-mechanics, angular-momentum, group-theory, representation-theory, wigner-eckart
My second question is, where does the $\mu$,$\nu$dependence of the reduced matrix $\left\langle\lambda\left|O^{\mu}\right| v\right\rangle_{\alpha} \equiv n_{\lambda}^{-1} \sum_{k}\left\langle e_{\lambda}^{k} \mid w_{\alpha k}^{\lam... | {
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"tags": "quantum-mechanics, angular-momentum, group-theory, representation-theory, wigner-e... |
backpropagation, lstm, overfitting, cost-function
Unit Tests & debugging:
after 20 000 backprops (done every 26 timesteps) a file is collected.
it was observed that gradients were very small on all 4 gates, especially after being passed through the activation function at each gate.
This is one of the reasons why Xavi... | {
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"openwebmath_score": null,
"tags": "backpropagation, lstm, overfitting, cost-function",
"url": null
} |
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