text stringlengths 1 1.11k | source dict |
|---|---|
mathematics, vectors
In abstract algebra, a field is an algebraic structure with notions of addition, subtraction, multiplication, and division, satisfying certain axioms. The most commonly used fields are the field of real numbers, the field of complex numbers, and the field of rational numbers, but there are also fi... | {
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"tags": "mathematics, vectors",
"url": null
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ros2, colcon
rc = await self.task(*args, **kwargs)
File "c:\opt\ros\foxy\x64\lib\site-packages\colcon_core\task\__init__.py", line 93, in __call__
return await task_method(*args, **kwargs)
File "c:\opt\ros\foxy\x64\lib\site-packages\colcon_ros\task\ament_cmake\build.py", line 59, in build
rc = await extens... | {
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"tags": "ros2, colcon",
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induction
5) That leaves the right hand side at a higher potential. Apart from the idea of "flowing" EMF pointed out by docscience, the main flaw in your logic is point 4. EMF is work per unit charge being done by the circuit elements on the current, so (to the extent that it makes sense to say the EMF has a direction... | {
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"tags": "induction",
"url": null
} |
saturn-rings, moonlet
Saturn's rings are thought to be relatively young, if 100 million years qualifies as young, but it is for objects inside the solar system. Being young doesn't tell us how long they will last. I think the 300 million year estimate may be accurate enough, originally mentioned in the comments, ... | {
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"tags": "saturn-rings, moonlet",
"url": null
} |
quantum-mechanics, optics, perturbation-theory
One can easily see that $c_2 c_1^*+c_1 c_2^*$ is relatively small. On the other hand if I take resonant condition $\omega \to \omega_{ni}$ and plot with respect to time I get:
So for times $t\gg \frac{2 \pi }{\omega _{\text{if}}}$ one can omit counterterms. | {
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"tags": "quantum-mechanics, optics, perturbation-theory",
"url": null
} |
quantum-mechanics, photons, electrons, standard-model
If you want to make the bound more precise than that, then you're going to have to come up with a test theory that predicts something different from what QED predicts. One problem you're going to have constructing such a theory is that if it says a photon is a comp... | {
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"url": null
} |
-
Have you drawn a diagram of $S$ and tried to sketch what the complex hull looks like it ought to be? – Henning Makholm Nov 14 '12 at 21:00
Yes, that was a typo. It has been removed. – icanc Nov 14 '12 at 21:03
@HenningMakholm Well, I know that it is a sine curve with $x \in \left(-\infty, \infty\right)$ and $y \in ... | {
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"tag... |
complexity-theory, reductions, space-complexity
This problem is DSPACE(f(n))-hard under log-space many-one reducibility. Here is a proof in the case of f(n) = lgkn. For each language L∈DSPACE(logkn), there is a Turing machine M (of the form stated above) which accepts L in c lgkn space for some c∈ℕ. Modify M to M′ ... | {
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"tags": "complexity-theory, reductions, space-complexity",
"url": null
} |
java, algorithm, matrix, search
This finds the value in the first row it could be in. This is slightly different to your algorithm which finds it in a diagonal. For example, when you search for 3 you find it here:
1 2 3
2 [ 3] 5
3 4 7
but when I search for it, I find it here:
1 2 [ 3] ... | {
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- The theory is not only a major challenge for the "serious mathematicians" (a serious mathematician is also interested on "foundations", he not only is working in concrete "mathematical" problems), the theory is also a great event in philosophy, and it is a beautiful and powerful tool for "thinking". The article in Wi... | {
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"lm_q2_score": 0.8539127473751341,
"openwebmath_perplexity": 1373.2999106960624,
"openwebmath_score": 0.6862840056419373,
"tags":... |
actuator
Title: Finding the name of: Mechanical toggle actuator utilizing single direction of force (pull only/push only) Preface: I have no formal experience in design or mechanical engineering. I am simply a backyard mechanic looking to see if a particular assembly exists as an off-the-shelf product before designing... | {
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"openwebmath_score": null,
"tags": "actuator",
"url": null
} |
condensed-matter
That is why the charge conductance is $\sigma^{\text{charge}} = e^2/h + (-e^2/h) = 0$ (where the minus sign comes from the fact that the current from the $|-\mathbf{k},\downarrow\rangle$ state is flowing in the opposite direction). However, a spin up current going in one direction (say $+\hat{x}$) and... | {
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"tags": "condensed-matter",
"url": null
} |
beginner, graphics, pdf, tex
% BEAMER APPEARANCE
\useoutertheme{wuerzburg}
\useinnertheme[realshadow,corners=2pt,padding=2pt]{chamfered}
\usecolortheme{shark}
\setbeamertemplate{navigation symbols}{}
% TIKZ
\usepackage{tikz}
\usetikzlibrary{tikzmark, arrows, decorations, decorations.pathreplacing}
\tikzset{every pic... | {
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"tags": "beginner, graphics, pdf, tex",
"url": null
} |
newtonian-mechanics, classical-mechanics, momentum, mass
Title: Relative velocity in variable mass We know, that for a general problem regarding variable mass, using the formula $F=\frac{dP}{dt} = M\frac{dv}{dt}+ v\frac{dM}{dt}$, can be dangerously invalid, as this is generally incorrect.
According to Wikipedia, and s... | {
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"tags": "newtonian-mechanics, classical-mechanics, momentum, mass",
"url": null
} |
quantum-field-theory, field-theory, gauge-theory, higgs, symmetry-breaking
There was an obstacle to the success of the Nambu-Goldstone program.
and then quotes from a paper by Goldstone, Salam and Weinberg,
''In a manifestly Lorentz-invariant quantum field theory, if there is a continuous symmetry under which the La... | {
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"tags": "quantum-field-theory, field-theory, gauge-theory, higgs, symmetry-breaking",
"ur... |
ros, ros-groovy, catkin-create-pkg
Title: Groovy catkin_create_pkg
I'm having the following message every time I try to use catkin_create_pkg. Any idea how to solve this???
Traceback (most recent call last):
File "/usr/local/bin/catkin_create_pkg", line 71, in <module>
main()
File "/usr/local/bin/catkin_creat... | {
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"url": null
} |
quantum-mechanics, quantum-interpretations, decoherence
Another interesting paper providing an unusual view of what decoherence is all about is Decoherence without decoherence (Weinstein, 2009). Abstract:
It has been claimed that decoherence of open quantum systems explains
the tendency of macroscopic systems to ex... | {
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"tags": "quantum-mechanics, quantum-interpretations, decoherence",
"url": null
} |
quantum-field-theory, renormalization, feynman-diagrams
At high momenta, diagram (a) goes like
$$
\int^\Lambda\frac{d^3k}{k^2}\sim \Lambda
$$
diagram (b) goes like
$$
\int^\Lambda\frac{d^6k}{k^6} \sim \log\Lambda
$$
diagram (c) goes like
$$
\int^\Lambda\frac{d^{12}k}{k^{10}} \sim \Lambda^2
$$
I actually don't quite un... | {
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"url": null
} |
These lines correspond to the x and y axes in the rectangular coordinate system. Good Grapher™ - great and very powerful scientific graphing calculator. That is, the z-value is found by substituting in both an x-value and a y-value. Illustrates the setup of a scene, camera, renderer, event handlers (for window resize ... | {
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"lm_q1q2_score": 0.8337229745151609,
"lm_q2_score": 0.8438951005915208,
"openwebmath_perplexity": 1009.6819380103711,
"openwebmath_score": 0.6727544069290161,
"tags": nu... |
• You have quantized the y-values in a way that the slope must be a multiple of 1/3. Could you try fewer x-values but more y-values? – Empy2 Apr 17 '16 at 2:46
• There are two new answers that suggest a curvy trajectory is better, which reduces my $1.21973$ number to about $1.216$. I will try to look if I have time. If... | {
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"lm_q1q2_score": 0.8290037642143584,
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"tags"... |
• Some test cases would help. As you've written this, I see @MichaelE2's suggestion as matching your requirement exactly. Jul 25 at 22:17
• maybe a lower dimensional case would help? for example, if i know that a 2D solution to a PDE has cylindrical symmetry, i would exploit that by solving the PDE in 1 dimension along... | {
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"lm_q1q2_score": 0.8110254299364663,
"lm_q2_score": 0.8333246015211009,
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"openwebmath_score": 0.6924818754196167,
"tag... |
python
It happens because for each subdirectory which contains NOT INVOICED you'll print containing directory name and all subdirectories. It can be easily fixed by adding an extra break in the end of the first if.
Now to the question. First of all, PEP 8 recommends using 4 spaces per one ident, neither tabs, nor 8 sp... | {
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} |
php, mysql, console, pdo
Title: Extract users and privileges from MariaDB and MySQL This was born out of a need to create database users on a new server to allow views to be created correctly when restoring databases. This is designed to be run from a command line NOT via a web server. It works with MySQL and MariaDB.... | {
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"tags": "php, mysql, console, pdo",
"url": null
} |
c, matrix, formatting
printf(" ])\n");
return;
}
if (row_size > 10)
{
for(i = 0; i < 3; i++)
{
if(i == 0)
printf("[ ");
else
printf("\t[ ");
if(col_size > 10)
{
for(j = 0; j < 3; j++)
... | {
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"id": 20818,
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"tags": "c, matrix, formatting",
"url": null
} |
downsampling, decimation, polyphase
Demonstration of Approach 2
The polyphase filter is constructed identical to the Band1 filter in Approach 1, without taking the real part to get the coefficients needed for the complex filter (this is essentially the analytic filter for Band1, as the real Band1 filter from above and... | {
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"tags": "downsampling, decimation, polyphase",
"url": null
} |
ros, navigation, ros-kinetic, multiple, turtlebot3
<!-- move_base -->
<include file="$(find turtlebot3_navigation)/launch/move_base.launch">
<arg name="model" value="$(arg model)" />
</include>
<!-- rviz -->
<group if="$(arg open_rviz)">
<node pkg="rviz" type="rviz" name="rviz" required="true"
... | {
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"tags": "ros, navigation, ros-kinetic, multiple, turtlebot3",
"url": null
} |
a radius of 8 m. A bicyclist passes beneath it, traveling in a straight line at the constant speed of 10 m/sec. A related rate problem involving a 2 cm long hair lying on a spherical balloon as the balloon is inflated. Air is being pumped into a spherical balloon. About Helium; 0. Find the rate of decrease of the radiu... | {
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"lm_q1_score": 0.9881308810508339,
"lm_q1q2_score": 0.8008592313124419,
"lm_q2_score": 0.8104789018037399,
"openwebmath_perplexity": 339.69184886938785,
"openwebmath_score": 0.865911602... |
ros2
but after i use this the config, the stream is just straight vertical, most pointclouds are gone.
any suggestions would definitely help thanks!
Originally posted by n000oob on ROS Answers with karma: 15 on 2023-05-24
Post score: 0
Some, at least minor, filtering is encouraged before throwing depth feeds into yo... | {
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sequence-alignment, assembly, software-recommendation, scaffold
It's not massively user friendly, but it's very fast, and it produces long, 'clean' alignments (i.e. almost all 1 to 1 alignments). The output format is a bit cryptic (zero-based start position and length instead of the more usual 1-based start and end po... | {
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"id": 154,
"lm_label": null,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "sequence-alignment, assembly, software-recommendation, scaffold",
"url": nu... |
energy, electrons, potential-energy
The electron gains energy and accelerates until it encounters a collision. This is a statistical process and there's a distribution for the energy loss for many electrons. Then, it can accelerate again from that point on, until it encounters another collision. This process continu... | {
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "energy, electrons, potential-energy",
"url": null
} |
thermodynamics, statistical-mechanics, entropy, information
Title: If information-theoretic and thermodynamic entropy need not always be identical, which is more fundamental? According to reference [1] in Does the act of storing information (not its erasure) locally increase entropy in Maxwell's demon's memory?, infor... | {
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"tags": "thermodynamics, statistical-mechanics, entropy, information",
"url": null
} |
javascript, jquery, html, css, html5
<div class="maDown">
<ul>
<li class="assignments"><a href="origindex.html" class="a"> First Class Page (A1) </a></li>
<li class="assignments"><a href="#" class="a"> Responsive Class Page (A2) </a></li>
<li ... | {
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ros, catkin, github, bloom-release, release
I then re-ran just the pull request only part and got the new, updated error message:
moveit_simple_grasps$ bloom-release moveit_simple_grasps -t indigo -r indigo --pull-request-only
==> Fetching 'moveit_simple_grasps' repository from 'https://github.com/davetcoleman/moveit_... | {
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"tags": "ros, catkin, github, bloom-release, release",
"url": null
} |
python, python-3.x, mvc, calculator, tkinter
Your Controller does not serve any purpose right now. It just passes the value from the View class through to the Model.
The Model on the other hand does all the work like checking what operator to apply and so on. But I think that's OK for now.
What is definitely missing i... | {
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"tags": "python, python-3.x, mvc, calculator, tkinter",
"url": null
} |
bash
# Check if we are root (no one else should run this)
# ==================================================
if (( $(id -u) != 0 )); then
echo "/ ! \ Only root can run this script. Backup cancelled." >&2
exit 3
fi
# Functions
# =========
# Given a date (or a placeholder), returns the corresponding hourly ... | {
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"tags": "bash",
"url": null
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bash, linux, installer, firefox
Title: Upgrade Firefox Quantum from tarball I wrote a little script to automate upgrading Firefox to a new version under Debian, since I don't want to install it from unstable and the snap version has rendering issues.
Any comments are welcome, is there anything I have missed or any pot... | {
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"tags": "bash, linux, installer, firefox",
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} |
python, object-oriented, numpy, statistics, matplotlib
plt.plot(t,y,label='Smoothed data',c='r')
plt.xlabel('Time Index')
plt.ylabel('Prices')
plt.plot(t,original_series,label='Original data',c='b')
plt.grid(True)
plt.legend()
... | {
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ros, slam, navigation, rtabmap, ros-indigo
* /camera/driver/mode: manual
* /camera/driver/serial_no:
* /camera/driver/usb_port_id:
* /camera/points_xyzrgb_sw_registered/queue_size: 100
* /depthimage_to_laserscan/output_frame_id: /camera_depth_frame
* /depthimage_to_laserscan/range_min: 0.45
* /depthimage_t... | {
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"tags": "ros, slam, navigation, rtabmap, ros-indigo",
"url": null
} |
telecommunication
Title: Could a one sensor node in a cluster sense a data more the others? I want to know if the sensor nodes in any cluster in a wireless sensor network may detect events in a different ratio i.e.some nodes could detect events more others in the same cluster, so is power consumption in these nodes wi... | {
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5. Originally Posted by Jhevon
there is only one point where the derivative is zero, so we don't really have to worry about fluxuations. just pick a point to the right of -b/2a and one to the left. for example, you may consider the derivative at x = -b/2a + 1 and x = -b/2a - 1. see what happens
I know what you're talki... | {
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... |
ros-melodic, pcl, ubuntu, pointcloud, ubuntu-bionic
create pointcloud publisher
create rate object with 1 second duration
load point cloud from file
while(ros::ok())
{
rate.sleep
publish point cloud message
}
}
Originally posted by PeteBlackerThe3rd with karma: 9529 on 2019-06-... | {
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"url": null
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with the standard metric? The diameter of the ball $$B(0,1)$$ is $$1$$, not $$2$$ (which would be twice its radius) • A problem with the question is that in general, in a metric space we can have$B(x,r)=B(x',r')$with$x\ne x'$or$r\ne r'$or both, so an open ball may not have a unique radius or center. Your example is goo... | {
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"openwebmath_score": 0.9558687806129456,
"tags... |
electrostatics, electric-fields, normalization
BUT field lines do not occupy a physical position in space so we can draw how many we want?
Does it make sense, then, to talk about the number of field lines? It does make sense to talk about the number of field lines, but only if you take care to represent the field amp... | {
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I W = number of women you choose, you have been asked to find the conditional probability $P\{W=2|W\geq 1\}.$ We have $$P\{W=2|W\geq 1\} = \frac{P\{W = 2 \cap W \geq 1 \}}{P\{W \geq 1\}} = \frac{P\{W = 2\}}{1-P\{W=0\}}.$$ The numerator and denominator are easily comutable using the hypergeometric distribution. The nume... | {
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"openwebmath_perplexity": 507.48202872060585,
"openwebmath_score": 0.7440478801727295,
"ta... |
java, algorithm, statistics, bioinformatics, markov-chain
Title: First order hidden Markov model with Viterbi algorithm in Java Introduction
A first order HMM (hidden Markov model) is a tuple \$(H, \Sigma, T, E, \mathbb{P})\$, where \$H = \{1, \ldots, \vert H \vert\}\$ is the set of hidden states, \$\Sigma\$ is the se... | {
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"tags": "java, algorithm, statistics, bioinformatics, markov-chain",
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operating-systems, threads
overall, if someone wants to create a new O.S, how should he know which model to choose? I am gonna be very careful here and say it is due to complexity of managing threads at two different levels did not produce the expected results, the lack of a direct mapping caused issues meeting POSIX... | {
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"tags": "operating-systems, threads",
"url": null
} |
thermodynamics, soft-question, phase-transition, chaos-theory, critical-phenomena
Instead, email operates more like chaos theory: at some point the time/energy required crosses a critical threshold, an unpredictable, invisible boundary. It undergoes a phase transition, like ice changing to water and then to steam. The... | {
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"tags": "thermodynamics, soft-question, phase-transition, chaos-theory, critical-phenomena"... |
covid, vaccine
It's clear they don't understand some of the features they discuss, such as LINE1 elements, calling LINE1 "endogenous reverse transcriptase" when they are actually transposons. They also seem to think there is just one LINE1 gene, not understanding that they are present in thousands of copies throughout... | {
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"tags": "covid, vaccine",
"url": null
} |
coordination-compounds, transition-metals
Title: Why does ligand exchange take place?
Why does ligand exchange happen?
Are there specific factors that determine when a ligand can replace another ligand?
When ligand exchange takes place, does that mean that the "previous" ligand is not bonded to the complex ion at... | {
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# Shorter way to calculate number of ways to distribute varying number of balls into 3 distinct boxes such that sum of balls $\leq$ 99
I need to find the number of ways to distribute a varying number of balls into 3 distinct boxes such that the sum of all balls is $$\le 99$$.
Since the balls are identical and the box... | {
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"openwebmath_score": 0.8882494568824768,
"tags"... |
special-relativity, inertial-frames
So, you see that although these two are equivalent scenarios, their result is not same. Now I believe that I might be wrong because the relative motion and light are normal to each other and hence it does not qualify to be equivalent scenarios and so their results are not bound to b... | {
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"tags": "special-relativity, inertial-frames",
"url": null
} |
php, regex
Title: Capturing optional regex segment with PHP I need to check the end of a URL for the possible existence of /news_archive or /news_archive/5 in PHP. The below snippet does exactly what I want, but I know that I could achieve this with one preg_match rather than two. How can I improve this code to treat ... | {
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Denote $A_n$ as the $n \times n$ matrix that has elements $a_{ij} = 1$ if $i \geq j$, and $0$ otherwise. Then, $A_n$ can be constructed by applying the elementary row operations $$R_2 + R_1, R_3 + R_2, \ldots, R_n - R_{n-1}$$ to the identity matrix $I_n$. So, $$A_n = \prod_{i=1}^{n-1} E_i,$$ where $E_i$ is the elementa... | {
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"lm_q1q2_score": 0.8598885641853226,
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"openwebmath_score": 0.953346312046051,
"tag... |
ros, orocos
Originally posted by Ruben Smits with karma: 543 on 2017-02-10
This answer was ACCEPTED on the original site
Post score: 1
Original comments
Comment by dinesh on 2017-02-10:
thank u, well i want to control the robot in real time so that is why i wanted to learn it. | {
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terminology, hashing
Title: What exactly (and precisely) is "hash?" I have heard the word "hash" being used in different contexts (all within the world of computing) with different meanings. For example, in the book Learn Python the Hard Way, in the chapter on dictionaries it is said "Python calls them "dicts." Other ... | {
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"tags": "terminology, hashing",
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electromagnetism, electrostatics, gauss-law, dielectric
$$\vec{E(x)} = \left\{\begin{array}{ll}
\frac{\sigma}{2\epsilon_0}\hat{z} & \textrm{for $ x > a $}\\
\frac{\sigma}{2\epsilon_0\epsilon_r}\hat{z} & \textrm{for $ x < a $}\\
\end{array}\right.$$
Which causes a discontinuity at $x = a$ at the surface of a slab $x <... | {
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java, calculator, number-systems
The rest of this method executes only if isBinary is true, so, at this point, you can just return from the method:
if (str.charAt(s) != '0' && str.charAt(s) != '1') {
System.out.println("You didn't enter a '0' or '1'");
main(args);
return;
}
after that, you don't need to c... | {
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"natural" and "artificial" are very relative notions. on the parabola, then, In mathematics, a parabola is a plane curve which is mirror-symmetrical and is approximately U-shaped. Introduction to Conics: Parabolas Cosmo Condina/Getty Images 10. A parabola is the set of all points $\left(x,y\right)$ in a plane that are... | {
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"lm_q1_score": 0.9830850906978876,
"lm_q1q2_score": 0.8336244549881283,
"lm_q2_score": 0.8479677526147223,
"openwebmath_perplexity": 373.28047375649123,
"openwebmath_score": 0.507796049118042,
"tags... |
particle-physics, experimental-physics, standard-model, feynman-diagrams, neutrinos
-which of these diagrams (maybe there are additive ones ?) correspond to the signal ?
The signal is to see a lepton and determine its lepton number. This will identify that the incoming neutrino has a specific flavor, which is the obj... | {
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robotic-arm, ros, joint, urdf
<joint name="joint_14" type="revolute">
<parent link="driving_3"/>
<child link="driven_3"/>
<origin xyz="0 -0.0729 0" rpy="0 0 0"/>
<limit lower="-1.57" upper="1.57" effort="10" velocity="3"/>
<axis xyz="0 1 0"/>
</joint>
<link name="motor_6">
<visual>
<or... | {
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} |
object-oriented, ruby, unit-conversion
#test Fahrenheit
temp = Fahrenheit.new(97.9, nil)
puts temp.to_s # 97.90 F
puts temp.has_fever? # false
On a personal note, I wouldn't necessarily use inheritance as my go-to solution for this problem without a lot more knowledge and thought about the use-cases; I only... | {
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crystal-structure, proteins
Could anybody explain me what this is and how I'm able to import the right complex in my program?
http://pdb101.rcsb.org/learn/guide-to-understanding-pdb-data/biological-assemblies Most of the structures in the Protein Databank are determined with X-ray crystallography. Like inorganic compo... | {
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javascript, simulation, underscore.js, genetic-algorithm
Title: Genetic Drift Simulator - Follow Up This question is a follow-up of a previous question of mine: Genetic Drift Simulator.
Following the advice given in the last question, and some more general improvements, the code has been slimmed down a bit. The major ... | {
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sequence-alignment, samtools, bwa, bowtie2
This step uses a combination of bwa mem and samtools view with the parameters –bS –f4.
An additional step consists of an alignment of the reads against the viral genome of interest, in order to exclude reads perfectly mapping the viral genome.
Therefore, only unmapped reads a... | {
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"tags": "sequence-alignment, samtools, bwa, bowtie2",
"url": null
} |
quantum-mechanics, double-slit-experiment, interference, statistics
There could be, those particles are wasted. It just means you fire more at the slits than arrive. The ones that arrive are the ones that make the interference pattern.
And the pattern itself is strips of regions that get more particles to land and one... | {
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"tags": "quantum-mechanics, double-slit-experiment, interference, statistics",
"url": nul... |
classical-electrodynamics, maxwell-equations, duality
Where the first implication follows from the transitivity of inequality and Faraday's law:
$$ \mathbf \nabla \times \mathbf E = -\frac{\partial \mathbf B }{\partial t } $$
And the second implication is the contrapositive of
$$ \mathbf E = 0 \implies \mathbf \nabla... | {
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Now define analogous functions $f_1$, $f_2$, but restricted only to sums of odd and eben squarefree numbers respectively.
Notice that:
$$f_2(s) = \sum_{even\,squarefree \,n} \frac{1}{n^s} = \sum_{odd\,squarefree \,n} \frac{1}{(2n)^s} = 2^{-s} f_1(s)$$
While $f_1(s)+f_2(s) = f(s)$. From that it is easy to get:
$$f_1... | {
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"openwebmath_score": 0.9828028082847595,
"ta... |
c#, .net, linq
Your code is going to crash but you can fix it either very simply:
var val = ...FirstOrDefault(x => x.JobOrderTypeIdentifier == identifier);
i.JobOrderTypeString = val != null ? val.Title : "SomeDefaultValue"; | {
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"tags": "c#, .net, linq",
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c#, design-patterns, winforms, mvp
private void buttonPaste_Click(object sender, EventArgs e)
{
if (PasteData != null)
{
PasteData(this, EventArgs.Empty);
}
}
private void treeView1_AfterSelect(object sender, TreeViewEventArgs e)
{
... | {
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"tags": "c#, design-patterns, winforms, mvp",
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general-relativity
I know that Birkhoff's theorem tells us that spherically symmetric asymptotically flat solution to GR is necessarily static, and therefore contains a timelike Killing vector, which implies conservation of mass (energy). Bondi et. al. seem to be stating the converse of this theorem, whose validity I ... | {
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"tags": "general-relativity",
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} |
f#, playing-cards
Suit = Hearts;};
Card {Face = Three;
Suit = Hearts;}; Card {Face = Two;
Suit = Hearts;}; Card {Face = Ace;
Suit = Clubs;};
Card {Face = King;
Suit = Clubs;}; Card {Face = Queen;
... | {
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"tags": "f#, playing-cards",
"url": null
} |
classification, pca, tsne
Title: can I use t-sne or PCA to reduce number of classes? I wanted to know if I can use t-sne or PCA to reduce the number of classes depending on the similarity between them. For example, if I have 100 classes of 100 different animals and would like to put all the cats in a group and all th... | {
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"id": 7118,
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"tags": "classification, pca, tsne",
"url": null
} |
electric-circuits, electrical-resistance, capacitance, dirac-delta-distributions
Title: Is this a Dirac delta function in disguise?
Consider a typical detector equivalent circuit, where the detector can be seen as an ideal current generator $I(t)$. Since $I = I_C + I_R$ (currents through the capacitor and resistor), ... | {
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special-relativity, representation-theory, lie-algebra
Title: On the homomorphism of the Lorentz algebra representation (1/2, 0) I was reading this answer and I don't quite understand how the $\rho$ homomorphism works. The generators of the two copies of $\mathfrak{su}(2)$ in $\mathfrak{su}(2)\oplus\mathfrak{su}(2)$ a... | {
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"tags": "special-relativity, representation-theory, lie-algebra",
"url": null
} |
powershell
here's how i would rework your code layout ...
Param (
[Parameter(
Mandatory)]
[string]
$FolderName
) | {
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By the way, great solution!
- 5 years, 5 months ago
Awesome! I also found a geometric interpretation solution.
- 5 years, 5 months ago
Can't wait to see it!
- 5 years, 5 months ago
Consider a triangle with angles $A$, $B$ and $C$ such that $A=\dfrac{4\pi}{9}$, $B = \dfrac{2\pi}{9}$ and $C = \dfrac{\pi}{3}$ . We h... | {
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"lm_q2_score": 0.8354835391516133,
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"openwebmath_score": 0.9963759183883667,
"tags":... |
algorithms, distributed-systems
Are there good patterns that fit this sort of problem? Its seems similar to what Amazon or others might do for inventory management.
Thank you! Your nodes will need to coordinate, otherwise the risk is unavoidable that they overspend. If you want there to be zero chance of overspendi... | {
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"tags": "algorithms, distributed-systems",
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} |
thermal-radiation
Title: Could a human feel the black body radiation of another human standing behind her? I've been thinking about infrared radiation and noticing more and more how the human skin seems actually pretty sensitive to it.
You can easily feel a bonfire from several meters away, far away from where any con... | {
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"tags": "thermal-radiation",
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} |
ros, catkin-make, ros-hydro, build, gazebo-ros-control
/home/leorm/catkin_ws/src/gazebo_ros_pkgs/gazebo_ros_control/src/default_robot_hw_sim.cpp:268:42: error: ‘sat_handle’ was not declared in this scope
make[2]: *** [gazebo_ros_pkgs/gazebo_ros_control/CMakeFiles/default_robot_hw_sim.dir/src/default_robot_hw_sim.cpp.o... | {
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"url": null
} |
04-29-2016, 02:19 AM
Post: #9
Claudio L. Senior Member Posts: 1,834 Joined: Dec 2013
RE: ACOS logarithmic form
(04-28-2016 08:58 PM)Valentin Albillo Wrote: .
Hi, Ángel:
(04-28-2016 06:42 PM)Ángel Martin Wrote: It's commonly accepted to define as "principal" branch the solution with argument between -pi and pi. This... | {
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by assigning different weights to data objects based on their estimated relevancy. Some of the examples are as follows: The Principal Component Analysis is a major application to find out the direction of maximum variance. λ k Σ k ′ the number of dimensions in the dimensionally reduced subspace, matrix of basis vectors... | {
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"lm_q1_score": 0.9811668734137682,
"lm_q1q2_score": 0.8067047406864422,
"lm_q2_score": 0.8221891327004132,
"openwebmath_perplexity": 850.2870432599236,
"openwebmath_score": 0.8346825242042542,
"tags... |
filtering, cwt, ssqueezepy
Here I identify my 2 frequencies f1 and f2 and select a frequency between the two, fc (in red, $f1 > fc >f2$). I want then to split my signal in two parts, everything below fc and everything above fc. To do so I perform an icwt for the two parts selected. Here it's simply a sin for each but ... | {
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"tags": "filtering, cwt, ssqueezepy",
"url": null
} |
quadcopter, navigation, software, research, px4
Title: What flight firmware stack is most common in aerial robotics research environments? I'm considering Aero-Astro grad school and am looking into acquiring a drone hardware platform to implement GNC/ PNT/ autonomy papers like those I might see from, e.g., the Navigat... | {
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"tags": "quadcopter, navigation, software, research, px4",
"url": null
} |
general-relativity, differential-geometry, notation, tensor-calculus
Title: Bracket Notation on Tensor Indices I know about the () symmetrisation and [] anti-symmetrisation brackets on tensor indices so long as they appear on their own, such as :
$$V_{[\alpha \beta ]}=\frac{1}{2}\left ( V_{\alpha \beta }-V_{\beta \alp... | {
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"url": nu... |
Z 2 0 e x2dxto within 10 1 of its true value using Taylor polynomials, we would need to compute Z 2 0 T 11(x)dx. During the expansion, simplifications such as grouping of like terms or. To find the Maclaurin Series simply set your Point to zero (0). © Carnegie Learning 13 13. 1, we considered applications of polynomial... | {
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"openwebmath_score": 0.7137375473976135,
... |
• +1 for #3, but how to get this formula: $\lceil\log_3k\rceil$? – Venus Nov 13 '14 at 14:32
• Each use of the balance scales actually compares three different groups of coins: the one on the left scale, the one on the right scale, and the one not on the scale at all. If one of the two groups on the scale is heavier, t... | {
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"lm_q1_score": 0.9822877002595528,
"lm_q1q2_score": 0.8950406254245054,
"lm_q2_score": 0.9111797136297299,
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"openwebmath_score": 0.7878023982048035,
"ta... |
real-time
From RFC2822 spec:
The zone specifies the offset from Coordinated Universal Time (UTC,
formerly referred to as "Greenwich Mean Time") that the date and
time-of-day represent. The "+" or "-" indicates whether the
time-of-day is ahead of (i.e., east of) or behind (i.e., west of)
Universal Time.... | {
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"tags": "real-time",
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} |
motor, pid, wheeled-robot
Fire a periodic interrupt at a fixed rate (In my case, I configured the STM32 to fire a systick interrupt every 1ms
In the ISR for the 1ms timer, decrement a global variable down to zero (stopping at zero)
In the ISR for compare and capture timer that detects the pulse from the Hall effect se... | {
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"url": null
} |
java, multithreading, api, asynchronous
* your requests otherwise it's safe to use the &ip=1 parameter
* described in the docs that is outside of the encoded data string.
* @param time
* is the time at which the event occured, it must be a unix
* timestamp, requests will... | {
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"tags": "java, multithreading, api, asynchronous",
"url": null
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electromagnetism, magnetic-fields, quantum-spin, electric-current, magnetic-monopoles
There is one objection and that is that we know about spin, the intrinsic magnetic moment of particles such as electrons. I don't think it is obvious whether spin should be treated as a magnetic charge dipole, or as a current loop. F... | {
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"tags": "electromagnetism, magnetic-fields, quantum-spin, electric-current, magnetic-monopo... |
pl.programming-languages, language-design
If you are interested in Idris-style verification, you should look at Xi et al's ATS language, which is a Rust/L3 style language with support for verification based on Haskell-style indexed types, only made proof-irrelevant and linear to give more control over performance.
An... | {
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"tags": "pl.programming-languages, language-design",
"url": null
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geophysics, earth-rotation
However! There are a few cases where the rotation of the Earth appears to have become faster, most noticeably in the 2003-04 and 2004-05 segments. What is the underlying cause of these and other temporary increases in the Earth's rate of rotation? (I'm asking this in a general sense, though ... | {
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"tags": "geophysics, earth-rotation",
"url": null
} |
python, performance, beginner, console, gui
def restartPrintSpooler():
os.system('cmd /c "net stop spooler & net start spooler"')
def DISM():
os.system('cmd /c "DISM /Online /Cleanup-Image /RestoreHealth & pause"')
def addSwitchUser():
os.system('cmd /c "reg add HKEY_LOCAL_MACHINE... | {
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"tags": "python, performance, beginner, console, gui",
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graph-algorithms, shortest-path
Problem
I now want to model the following situation. I want to travel from point A to point B in a city via public transport and minimize time. The public transport network can be easily modelled as a directed graph as you would expect. The interesting part are the edge-weights (that mo... | {
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"tags": "graph-algorithms, shortest-path",
"url": null
} |
ros
Building CXX object CMakeFiles/data_viewer.dir/src/RobotThread.cpp.o
Building CXX object CMakeFiles/data_viewer.dir/src/ViewerWindow.cpp.o
[ 83%] [ 91%] Building CXX object CMakeFiles/data_viewer.dir/qrc_images.cxx.o
Building CXX object CMakeFiles/data_viewer.dir/src/moc_RobotThread.cxx.o
Building CXX obje... | {
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"tags": "ros",
"url": null
} |
mathematical-physics, differential-geometry, mathematics, relativity, vectors
But Muphrid, aren't we meant to be working with the actual vector $v$ in the tangent space of $M$ at $p$, not its expression in a chart, $d\phi_1(v)$?
You might think so, but (as was drilled to me repeatedly in a differential geometry course... | {
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"... |
homework-and-exercises, dirac-equation, klein-gordon-equation, dirac-matrices, clifford-algebra
I am puzzled as to how the quantity in red box was derived. I do understand the process after this though, where they made use of the anti-commutator relation $\left\{ \gamma^{\mu}, \gamma^{\nu}\right\} = 2g^{\mu \nu}$. Can... | {
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"tags": "homework-and-exercises, dirac-equation, klein-gordon-equation, dirac-matrices, cli... |
crystals, metals, insulators
Solids can be classified on the basis of the bonds that hold the atoms or molecules together. This approach categorizes solids as either molecular, covalent, ionic, or metallic.
Iodine (I2), sugar (C12H22O11), and polyethylene are examples of compounds that are molecular solids at room tem... | {
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"tags": "crystals, metals, insulators",
"url": null
} |
nyquist, baseband
Title: Bandwidth computation for NRZ baseband transmission scheme In Andrew Tanenbaum's book on Computer Networks, while explaining about bandwidth of a NRZ (Non Return to Zero) baseband transmission scheme, he says the following:
With NRZ, the signal may cycle between the positive and negative leve... | {
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"tags": "nyquist, baseband",
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python, python-3.x, physics
def v_dep(**variables):
"""force depends on the velocity vector
(i.e. charged particle in magnetic field)"""
v_xy = variables['v']
v_ = math.hypot(v_xy[x], v_xy[y])
fi = math.atan2(v_xy[y], v_xy[x])
F_ = v_
dfi = math.pi/2
F_x = F_*math.cos(fi+dfi)
F... | {
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"openwebmath_score": null,
"tags": "python, python-3.x, physics",
"url": null
} |
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