text stringlengths 1 1.11k | source dict |
|---|---|
general-relativity, cosmology, reference-frames, space-expansion
See Carrol's lecture notes at https://ned.ipac.caltech.edu/level5/March01/Carroll3/Carroll8.html
The coordinate system which takes the time orthogonal to the spatial slices everywhere is then a preferred frame. It is the comoving coordinate system.
Como... | {
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"tags": "general-relativity, cosmology, reference-frames, space-expansion",
"url": null
} |
software-engineering
Title: Is computer science pointless For example, in real life, you're working with real time data that is constantly appended to. Computer science assumes a static problem, like traveling salesman. In reality you would start with a set of cities and add and remove them over time, so the solution ... | {
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"tags": "software-engineering",
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} |
ruby, ruby-on-rails, i18n
Title: Setting locale based on preferences with fallbacks Consider the following code. Are the multiple assignments to the loc variable a code smell? If so, how can I refactor this?
def set_locale
begin
loc = user_signed_in? ? user_locale : browser_locale
loc = browser_locale if loc... | {
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"tags": "ruby, ruby-on-rails, i18n",
"url": null
} |
electromagnetism, electromagnetic-induction
Title: On magnetic fields 'inducing' electric fields Griffith's Introduction to Electrodynamics, 4th Ed. introduces the concept of Faraday's law by providing us with three experiments: one in which a coil is pulled out of a region of a constant magnetic field (the field is p... | {
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"tags": "electromagnetism, electromagnetic-induction",
"url": null
} |
turtlebot2, turtlebot, kobuki, ros-groovy
[ 2553.597530] ehci_hcd 0000:00:1d.0: HC died; cleaning up
[ 2553.606569] usb 2-1.4: device descriptor read/all, error -108
[ 2553.606582] hub 2-1:1.0: cannot disable port 4 (err = -19)
[ 2553.606606] hub 2-1:1.0: cannot reset port 4 (err = -19)
[ 2553.606614] hub 2-1:1.0: can... | {
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"tags": "turtlebot2, turtlebot, kobuki, ros-groovy",
"url": null
} |
prolog
Modern compilers go to a lot of trouble to perform optimisations using type and mode inference (and annotations, if they are available). You lose all that when you give the compiler less information.
Another consideration is semantic, especially considering non-logical control such as the cut. Consider this:
p(... | {
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find an exponential, linear or a polynomial fit for any curve. Here we describe continuous least-square approximations of a function f(x) by using polynomials. Where $$A^{+}$$ is the pseudoinverse of $$A$$. But normally one y_n \\ Least squares approximations in . 8, at the lower right. Rewriting the approximated value... | {
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"lm_q1_score": 0.9728307661011976,
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"lm_q2_score": 0.8459424334245617,
"openwebmath_perplexity": 1037.5018445254555,
"openwebmath_score": 0.9514498114585876,
... |
rosnode, raspberrypi, rqt-graph, network-setup, ros-groovy
Title: node on rqt_graph is in red color always
Hi,
This question is for experienced ROS users. First about My setup which involves, a raspberrypi (B+ model, wheezy OS, ROS groovy deb installation) and desktop PC (AMD dual core, Ubuntu 12.04.5, ROS groovy). I... | {
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"tags": "rosnode, raspberrypi, rqt-graph, network-setup, ros-groovy",
"url": null
} |
quantum-field-theory, mathematical-physics, resource-recommendations, mathematics
Title: Mathematically rigorous QFT text There are multiple questions on here about QFT textbook recommendations, but I am looking for mathematically precise texts on QFT.
Recommendations of introductory and advanced texts are welcome, bu... | {
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c#, concurrency, cache, tpl-dataflow
Cache.RunGetterFunction(Id);
}
}
}
} You're not afraid of long names which is great. Descriptive long names are definitely better than vague short ones. I think you could probably make the code slightly easier to read though:
getterFunction could be valueFac... | {
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Is there a way to prove the statement (or better yet provide solutions to the equation) without first relying on Pythagoras?
• N is a natural number too; I just edited the question to reflect this. – acernine Dec 26 '16 at 11:45
• Since $n \in \mathbb{N}$, infinitely many solutions may be generated when $n=1$. – proje... | {
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ros, catkin-make, nodes, services
Originally posted by PeteBlackerThe3rd with karma: 9529 on 2016-02-18
This answer was ACCEPTED on the original site
Post score: 0
Original comments
Comment by gvdhoorn on 2016-02-18:\
Not sure if I was missing something really obvious [..] | {
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machine-learning, correlation
That means any linear transformation of one or both features (eg multiplying by random factors), simply leaves the linear relation intact.
$x_{21}$ = $a \cdot x_2$, $x_{11} = b \cdot x_1$
Then
$x_{21} = a \cdot c_0 + a \cdot s/b \cdot x_{11} + \epsilon'$
Thus again there is linear relatio... | {
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• Cool! thanks sir, I'm wondering how did you come up with the formula for $n(i)$ and $c_k^{(d)}(n_i)$ and how did you graph $c_1(n_i)$ as $c_1(n_i)$ is a infinite sum. Is the choice of the number of terms to add a numerical method. – user 42493 Jul 2 at 0:24
• The formulas for $n(i)$ is the solution to a summation, wh... | {
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"tags... |
• A negative column index corresponds to a leftward shift of the columns of H.
• A positive row index corresponds to a downward shift of the rows of H.
• A positive column index corresponds to a rightward shift of the columns of H.
To cast the indices in MATLAB® form, add the size of H: the element C(k,l) correspond... | {
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"lm_q2_score": 0.8438951025545426,
"openwebmath_perplexity": 3269.24235451021,
"openwebmath_score": 0.5948792695999146,
"tags": n... |
inorganic-chemistry, physical-chemistry, thermodynamics, quantum-chemistry
We will need to use quantum physics to answer this question, so it gets further than the classical chemistry problems. I therefore consider electrons as matter waves, their position being non-deterministic, the probability of their presence at ... | {
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"... |
measures of the sides and angles of right triangles using the primary ratios When we want to measure the height of an "inaccessible" object like a tree, pole, building, or cliff, we can utilize the concepts of trigonometry. For a boat with a displacement of ‘d’ pounds and a sail area of ‘A’ square feet S = 16Ad-2/3 a) ... | {
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"lm_q1_score": 0.9863631671237733,
"lm_q1q2_score": 0.8109770726076169,
"lm_q2_score": 0.8221891283434876,
"openwebmath_perplexity": 1571.7178582619654,
"openwebmath_score": 0.35488325357437134,
"tags... |
beginner, ruby, iteration
Same idea, just written out in separate filter/count steps.
You can also skip the return since that's implied at the end of a method.
I'd also use a plain array for the vowels. Looking up hash keys is faster, sure, but does it really matter that much? Nah. "Premature optimization is the root ... | {
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newtonian-mechanics, newtonian-gravity, acceleration, projectile, drag
Acceleration (or deceleration) is the rate of change of velocity. So, to find the rate of change of velocity of an object you divide all the forces acting on it, by the object's mass.
The forces acting on your hypothetical object are the object's ... | {
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"url": ... |
reference-request, co.combinatorics, soft-question, big-picture
However, there two things that you must realize with respect to these links. One is that it is not clear that range spaces of HAPs are very natural. When do you expect to have input that is a multiset of integers and want to answer how many elements of a ... | {
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The binomial distribution with amount $$n$$ and success rate $$p$$, is more often denoted $$\mathcal{Bin}(n,p)$$.
$$Z\sim\mathcal{Bin}(n,p)$$ denotes that random variable, $$Z$$ is a count of successes among $$n$$ independent Bernoulli trials with identical success rate $$p$$.
So given that the independent random var... | {
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"tags... |
"enter". Here is a set of practice problems to accompany the Area with Polar Coordinates section of the Parametric Equations and Polar Coordinates chapter of the notes for Paul Dawkins Calculus II course at Lamar University. To obtain very accurate graphs, technology is a great aid. Solution: Area of the curve enclosed... | {
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"id": null,
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9861513905984457,
"lm_q1q2_score": 0.8130442815718196,
"lm_q2_score": 0.8244619328462579,
"openwebmath_perplexity": 490.98177478940477,
"openwebmath_score": 0.8563680648803711,
"tag... |
# Calculus - Derivatives and Tangent Lines
I am trying to find the equation of the lines (there's 2) tangent to the graph of $f(x) = x^3$ and parallel to the line $12x − y + 1 = 0$.
So far obviously the slope of the line must be $12$. The equation of the line tangent to $f(x) = x^3$ is the derivative and must be equa... | {
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"lm_q1q2_score": 0.8157281999042982,
"lm_q2_score": 0.831143045767024,
"openwebmath_perplexity": 121.56592729954097,
"openwebmath_score": 0.8527116179466248,
"tag... |
r, wdl, docker
runtime {
docker: "firsttrydocker"
}
output {
File output_R = stdout()
}
}
``` | {
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quantum-mechanics, hilbert-space, wavefunction, notation, quantum-states
$$ |\psi\rangle = \int_{-\infty}^{\infty}dx \ \psi(x)|x\rangle,$$
where $\psi(x)$ is the familiar position space wavefunction. This should help explain why the last line has the integral in it, it comes from this superposition of states of defini... | {
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"tags": "quantum-mechanics, hilbert-space, wavefunction, notation, quantum-states",
"url"... |
homework-and-exercises, electrostatics, charge, coulombs-law
Title: Two positive charges $q$ and $3q$ and are a length 10 cm apart (a) Where could a third charge be placed so as to
experience no net force?
The solution is as follows
$$ K_e \frac{q_1q_3}{x^2}=K_e\frac{3q_1q_3}{(x-a)^2}$$
I understand you can cancel out... | {
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"url": null
} |
python, python-3.x, functional-programming, chess, n-queens
Here is the final result:
import itertools
def safe(positions, k):
"""Given a list of positions, return True if the queen on the `k` column is safe."""
return not any(
menaces((k, positions[k]), pair)
for pair in enumerate(positions)
... | {
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"tags": "python, python-3.x, functional-programming, chess, n-queens",
"url": null
} |
# How do I represent this sine function?
1. Mar 15, 2015
I was struggling to represent the following for integer values of n:
$$\sin \left( \dfrac {n\pi } {2}\right)$$
I know for even n, we get zero
But for odd n, it alternates beween 1 and -1 for every other odd. Is there a compact way to represent that? I feel l... | {
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"lm_q1_score": 0.9811668714863165,
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"openwebmath_score": 0.9998975992202759,
"ta... |
ros, nav-msgs, github, rosdep
Once it is completed, do the following:
cd ~/catkin_ws
catkin_make
Originally posted by skr_robo with karma: 178 on 2016-07-28
This answer was ACCEPTED on the original site
Post score: 6
Original comments
Comment by vacky11 on 2017-02-08:
I am using ros indigo and I followed ur steps b... | {
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"tags": "ros, nav-msgs, github, rosdep",
"url": null
} |
c++, c++17, boost
for (auto i = alignBegin1; i < alignEnd; i += input1Size)
{
(xsimd::load_aligned(&(begin1 + i)->template get<Is>(), std::get<Is>(input1Batches)), ...);
(xsimd::load_aligned(&(begin2 + i)->template get<Js>(), std::get<Js>(input2Batches)), ...);
... | {
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"tags": "c++, c++17, boost",
"url": null
} |
context-free, formal-grammars
$$
\begin{align*}
&S \to aAbS' \mid bBaS' \\
&S' \to aAbS' \mid bBaS' \mid \lambda \\
&A \to aAbA \mid \lambda \\
&B \to bBaB \mid \lambda
\end{align*}
$$
As a somewhat degenerate example, the derivation tree for $abab$ is: | {
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mathematics, category-theory
Title: Studying the logical structure of physics as a mathematical object per se? I was wondering is there a branch of mathematical physics which studies the underlying logical structure of physics as a mathematical object per se?
Let me explain what I mean by that.
I'm interested in a th... | {
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"tags": "mathematics, category-theory",
"url": null
} |
ds.algorithms, graph-algorithms, np-hardness, approximation-algorithms
We can assume that the subgraph with the heaviest MST includes all of the degree-one vertices, because adding one of these vertices to a subset can never decrease the number of components. So the vertices that were removed to form the subgraph are ... | {
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"url": ... |
navigation, odometry, turtlebot, ros-kinetic, gmapping
<param name="resampleThreshold" value="0.5"/>
<param name="particles" value="200"/>
<param name="xmin" value="-1.0"/>
<param name="ymin" value="-1.0"/>
<param name="xmax" value="1.0"/>
<param name="ymax" value="1.0"/>
<param name="delta" value="0.05"/>
<param name... | {
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"tags": "navigation, odometry, turtlebot, ros-kinetic, gmapping",
"url": null
} |
homework-and-exercises, electromagnetism, forces, potential, potential-energy
\end{align}
You pretty much have this expression written down as your LHS, I just wanted to point out that instead of $\dot{A}_i$, you should have written $\frac{\partial A_i}{\partial t}$.
Now, we go to the RHS . You actually have all the r... | {
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... |
c++, algorithm
Note that auto cc creates a copy in the inner loop, where one can add elem before adding it to result.
Instead if the new C++11 ranged-for and auto one can of course just use lengthy iterator-based for-loops.
Using vector instead of set would also work, I guess. There are no set-operations involved here... | {
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gazebo
In file included from /usr/include/boost/bind/mem_fn.hpp:215:0,
from /usr/include/boost/mem_fn.hpp:22,
from /usr/include/boost/bind/bind.hpp:26,
from /usr/include/boost/bind.hpp:22,
from /home/winston/workspace/nubot_gazebo_ws_extended/src/nubo... | {
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equilibrium, aqueous-solution, hydrolysis
While you can see in the case of $\ce {NaCl}$ there won't be $\ce {NaOH}$ and $\ce {HCl}$ compounds in the solution: because $\ce {NaOH}$ and $\ce {HCl}$ are "strong", there won't be a hydrolyzation equilibrium. But yes, you can say there are $\ce {H+}$ and $\ce {OH-}$, as you... | {
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authors' knowledge, for the researches referring to the triple integral term in the LKFs, most literature directly applied the Jensen-based double integral inequality (JBDII) (see (17) for details) to achieve the estimation task. More than just an online double integral solver. Consequently, we are now ready to convert... | {
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11. Apr 21, 2005
### mathwonk
Although you are problem solving at the moment, hence more flexibility is allowed, when writing it up, instead of "orthogonal basis" you should perhaps say "orthogonal eigenbasis".
I notice that physicists are fond of introducing hypotheses after the fact to get themselves out of troubl... | {
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"openwebmath_score": 0.8208373785018921,
... |
nomenclature, phase
For $\ce{Cu_{1.5}Al}$ it is similar, but perhaps even more confusing. The 'Published phase label' is $\ce{Cu_{1.5}Al}$, so that is what it is usually called in the literature. The 'formula' is $\ce{Cu_{1.7}Al}$, which just means when people started referring to the phase they didn't have an accur... | {
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"openwebmath_score": null,
"tags": "nomenclature, phase",
"url": null
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physical-chemistry, acid-base, equilibrium
I found the concentration of $\ce{H+}$ in formic acid.
For calculating $\ce{[H+]}$ in $\ce{HCOONa}$, I am planning to use the equation:
$$\mathrm{pH} = \mathrm{p}K_\mathrm{a} + \log\frac{[\text{salt}]}{[\text{acid}]}$$
But I don't know the $\mathrm{p}K_\mathrm{a}$ of $\ce{HCO... | {
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ros, laser, turtlebot2, turtlebot, asus-xtion-pro
Originally posted by pgigioli on ROS Answers with karma: 354 on 2016-03-21
Post score: 1
The competing is expected. In ROS robots are defined in a description file, most of the time stored as .urdf file in a <robot_name>_description package. When you launch your robot... | {
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S_4: iff q is odd and 24 | #PSL_2(F_q)
and nicest of all:
A_5: iff 60 | #PSL_2(F_q)
we'll also give the explicit congruence criteria on q mod 8 or 5
that check those divisibility conditions.
April 15: When does PSL_2(F) contain the exceptional triangle groups
A_4, S_4, A_5?
As announced last time:
Proposition. Le... | {
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c, file-system
and client.log:
#CLIENT
WARN,2011-10-21 14:32:09,session started
INFO,2011-10-21 14:32:14,calling server
ERROR,2011-10-21 14:32:20,error while calling
DEBUG,2011-10-21 14:32:21,disconnecting
Then when you type ./mylogger in terminal, the program will read these two files and output a combinedlogs.log f... | {
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python
# TODO: this needs a lot of refinement.
if __name__ == "__main__":
pdf_path = '/path/to/any/test-resume.pdf'
main(pdf_path) Self-analysis
The analysis of your own code is pretty accurate, which is a great start
Style
This code follows PEP8 guidelines for the most part, which is also great
Docstrings
The... | {
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the π factor is built in to the. Example: Laplace Transform of a Triangular Pulse. For this example I had saved as step_fn. Shifted Unit Step function. Plotting a unit step function without heaviside. Learn the basics of practical machine learning methods for classification problems. It deals with control system design... | {
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"openwebmath_score": 0.5590897798538208,
"tag... |
special-relativity, visible-light, speed-of-light, physical-constants
More on the Lorentz Group
The following might look a bit daunting at first but it really is intuitive and we're not talking about at first anything that gainsays everyday Galilean relativity, so I'd urge you to think about applying these ideas to th... | {
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ros
Comment by Pedrucius on 2016-06-18:
Thanks man! My router had a problem, but now it's solved. Just a simple port forwarding did the trick.
Comment by nishthapa on 2016-06-18:
Glad I could be of help. | {
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natural-language-processing, word-embedding, word2vec
Here's my interpretation of what this procedure is trying to do: given a context, we're trying to learn maps $\mathcal{U}$ and $\mathcal{V}$ such that given a context like "the cat ____ over a", the model should give a high score to words like "jumped" or "leaped",... | {
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"tags": "natural-language-processing, word-embedding, word2vec",
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ros, gazebo, image-raw, camera
Title: How to understand data from the image_raw/compressed topic?
I wanted to know what they represent and how to read data from the image_raw / compressed topic. For example, the laser / scan topic, your "ranges" data represent the distance to an object, so the image_raw / compressed ... | {
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fluid-mechanics
In fact, Newton's model is not too unrealistic for a completely different scenario, namely piercing a hole through a (fairly loose) granular material like earth. Indeed, the shape of the nose of a typical "mole" tool used for trenchless tunneling is the simple pointed cone shape that Newton claims woul... | {
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astrophysics
The interstellar medium is nearly entirely atomic hydrogen, either neutral or ionized. The temperature is typically 100-1000 K. The mean free path of these atoms is very large: 105 miles up to a million times that. The mean speed of the atoms is about 1 kps.
That means that any effect the passage of the s... | {
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python, python-3.x, object-oriented
Title: Basic Blackjack program in Python So in my quest to learn coding while having very little formal training has got me here. I am trying to learn the OOP concept and this is my first proper attempt at using OOP.
Can you guys point out what can be improved and what are the bette... | {
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javascript, performance, jquery, html, logging
readUtilLog();
setInterval(function(){readUtilLog();}, 5000);
function readUtilLog(){
$.get("UtilRun.log", function(data){
if (data.length < 256000){
$.get("UtilRun.log.1", function(data1){
d=data1 + data;
... | {
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"openwebmath_score": null,
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to how the data is binned. In the first test, we consider symmetry with respect to the line θ = π 2 θ = π 2 (y-axis). was used, i.e., boot = TRUE). To sketch a polar curve, first find values of r at increments of theta, then plot those points as (r, theta) on polar axes. The box plots were used to represent feature spa... | {
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"lm_q1q2_score": 0.8293384871274211,
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"openwebmath_score": 0.5380195379257202,
"tags... |
• You first example is also not first countable, or second countable, e.g. – Henno Brandsma Mar 31 '18 at 5:30
Let $X$ be $\mathbb{R}$ in the usual topology, define an equivalence relation on $X$ by $x \sim y$ iff $x-y \in \mathbb{Q}$, let $Y$ be the set of classes, and let $q$ be the standard map that sends a point t... | {
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"lm_q1_score": 0.9683812309063186,
"lm_q1q2_score": 0.8069758993570183,
"lm_q2_score": 0.8333245973817158,
"openwebmath_perplexity": 236.42318876289028,
"openwebmath_score": 0.9378007054328918,
"ta... |
• Can you cite a textbook/paper that contains this definition of a two dimensional curl? Mar 5 '15 at 9:03
• @Sjoerd2228888 Idon't have any such reference. Bit googling "curl 2d" gives lots of hits that look relevant. Mar 5 '15 at 12:52
• Google yields a lot of results but so far I did not find any reference to a textb... | {
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"openwebmath_score": 0.8850082755088806,
"tag... |
javascript, node.js, async-await
EDIT: I forgot to mention, ServerCommunicator requires request. const request = require('request-promise'); I found the answer to my problem. Here is the code:
Controller:
this.serverCommunicator = new ServerCommunicator();
//some stuff | {
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java, complexity
System.out.println(matrix[i][m]);
}
System.out.println(String.join("", matrix[n]));
}
This is in a separate method, which makes it easy to reuse.
This prints the first and last line separately. So we don't need that part of the if.
This prints the spaces separately from the ... | {
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rna-seq, human-genome, genome-index
Settings:
Output files: "imam002.*.ht2"
Line rate: 7 (line is 128 bytes)
Lines per side: 1 (side is 128 bytes)
Offset rate: 4 (one in 16)
FTable chars: 10
Strings: unpacked
Local offset rate: 3 (one in 8)
Local fTable chars: 6
Local sequence length: 57344
Local s... | {
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performance, comparative-review, go, binary-search, benchmarking
(That said, I'm not convinced it matters — the compiler should probably optimize this anyway.)
I tried it and was very surprised to see that the benchmarks were still very poor. Turns out, you called the wrong function in your benchmark :-) BenchmarkGetR... | {
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ros, create, catkin-workspace
Title: What does the command 'catkin_init_workspace' do?
In reading different accounts of how to create a ROS workspace (in Hydro), I encountered a discrepancy. In the ROS tutorial sequence, a command 'catkin_init_workspace' is executed before going on to the 'build' process. In other ac... | {
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"tags": "ros, create, catkin-workspace",
"url": null
} |
java, concurrency
}
My questions are:
Does this look correct? Have I correctly understood the ExecutorService API?
Is it thread-safe? Are there any deadlocks or race conditions I haven't spotted?
Am I correct in thinking isShutdown() and isTerminated() don't need
synchronization?
Is it too thread-safe, i.e. am I ... | {
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c#, dependency-injection, controller
return propertyDimensionResponse;
}
}
(My C# coding is a little rusty, so please forgive any syntax errors). | {
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javascript, dom
// loop through each value
values.forEach(function(element, index){
// and push it into the item[] array
if(element !== '') {
item.push(element);
}
});
// make sure required items are filled out
if(values[0] === '' && values[4] === '') {
alert('Name and Link are both requ... | {
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"tags": "javascript, dom",
"url": null
} |
c++, parsing, json, qt
case '"':
// End of string
return QVariant(string);
default:
string.append(ch);
}
}
return QVariant();
}
QVariant QJson::parseUnquotedString(const QString &json, int &index, bool &success, QString *errorMessage)
{
QString string;... | {
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atmospheric-science, climate-science
$$\Delta F = F_{CO2}'-F_{CO2} = \beta \Phi \left( (\lambda_2' - \lambda_2) + (\lambda_1 - \lambda_1') \right)= \beta \Phi \left( \Delta \lambda_2 + \Delta \lambda_1 \right)$$
Now here is the beef, we can find $\Delta \lambda_1$ from the prior Taylor series expansion. Remember, the... | {
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windows
D:\ros2_ws\src\slam_toolbox\lib\karto_sdk\src\Mapper.cpp(418,8): error C2065: 'uint': undeclared identifier [D:\ros2_ws\build\slam_toolbox\lib\karto_sdk\kartoSlamToolbox.vcxproj]
D:\ros2_ws\src\slam_toolbox\lib\karto_sdk\src\Mapper.cpp(418,13): error C2146: syntax error: missing ';' before identifier 'i' [D:\r... | {
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python, python-3.x, security, database
run()
This is the output. At the top I printed out the string.ascii variables so you don't have to type out each letter and number:
['abcdefghijklmnopqrstuvwxyz', 'ABCDEFGHIJKLMNOPQRSTUVWXYZ', ['
!', '@', '#', '$', '%', '&', '*', '(', ')', '-'], '0123456789']
Username:> test
Pas... | {
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"openwebmath_score": null,
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"url": null
} |
Zondrina
So this is your function if I'm not mistaken : $\frac{4}{e^{-x}} = 4e^x$.
As $x → ∞$, $4e^x → ∞$. So there are no horizontal asymptotes happening in this direction.
Why do you think $y=0$ is a horizontal asymptote for your function? Can you elaborate?
3. Sep 7, 2013
mileena
Hi Zondrina!
Yes, you interpr... | {
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"lm_q1_score": 0.9653811601648193,
"lm_q1q2_score": 0.8023698438421751,
"lm_q2_score": 0.8311430520409023,
"openwebmath_perplexity": 811.5071454772104,
"openwebmath_score": 0.8940988779067993,
"tag... |
quantum-mechanics, quantum-computer
In other words the language barrier between classical people and quantum interpretation. There is no technical limitation to QC's at this time only a limit of our ability to minipulate qbit
s the do What we want.
http://www.cra.org/ccc/docs/init/Quantum_Computing.pdf is a PDF docume... | {
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python, random-forest
Then I played around with the number of samples and I got the following results: the more samples I use, the lower accuracy I get. Here are results for 2'500, 10'000 and 100'000 samples, on x axis the number of steps ahead I am trying to predict, on y axis accuracy, red is the train set, blue is ... | {
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"url": null
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boost
[rosmake-0] Finished <<< rein [FAIL] [ 99.33 seconds ]
[ rosmake ] Halting due to failure in package rein.
[ rosmake ] Waiting for other threads to complete.
[ rosmake ] Results: ... | {
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machine-learning, deep-learning, comparison
Title: What is the difference between machine learning and deep learning? Can someone explain to me the difference between machine learning and deep learning? Is it possible to learn deep learning without knowing machine learning? Deep learning is a specific variety of a spe... | {
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"tags": "machine-learning, deep-learning, comparison",
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laws-of-physics
Title: Universality of the laws of physics How is it known at any point in the space of this universe that there is no particle in which its gravitational force does not follow Newton's law or other current laws?
How does the same matter apply to other fundamental forces, does not apply to that particl... | {
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$\displaystyle (k_1,\ldots,k_d) \cdot (x_1,\ldots,x_d) := k_1 x_1 + \ldots + k_d x_d$
which maps ${{\bf Z}^d \times {\bf T}^d}$ to ${{\bf T}}$.
Proof: The “only if” part is immediate from (1). For the “if” part, we see from (2) that (1) holds whenever ${f}$ is a plane wave ${f(y) := e(k \cdot y)}$ for some ${k \in {\... | {
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"openwebmath_score": 0.9742940664291382,
"tags": ... |
php, json, http, authentication, swift
func attemptSignIn() {
var variables: [String] = ["username=" + self.username + "&"]
variables.append("password=" + self.password)
request("https://codekaufman.com/login.php", variables: variables)
println("Attempting sign-in...")
}
privat... | {
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homework-and-exercises, newtonian-mechanics, rotational-dynamics, free-body-diagram
The answer you have arrived at yourself ($T_2=\frac{1}{32}mg$) - from the calculation which you have shown using Principle #1- is correct. It correctly explains how the resultant force $F$ on portion CB causes the known acceleration $a... | {
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c++, algorithm, programming-challenge, array, time-limit-exceeded
Use not a vector but a sorted container, e.g. a std::priority_queue or (since there are no two citizens with the same wealth) a std::set.
Keep a heap inside your vector: std::make_heap.
Sort your vector whenever the king comes. (Though this only works g... | {
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"url": nu... |
ros, ros2, tutorials
Originally posted by SSar on ROS Answers with karma: 53 on 2020-09-14
Post score: 0
on windows you have to:
set "RCUTILS_LOGGING_BUFFERED_STREAM=1"
It is described here:
https://index.ros.org/doc/ros2/Tutorials/Logging-and-logger-configuration/
Originally posted by aalexanderr with karma: 46 on ... | {
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"url": null
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___________________________________________________________________________________
Result 7
We now show that $\mathbb{M} \times \mathbb{P}$ is not normal where $\mathbb{P}$ has the usual topology. In this proof, the following two facts are crucial:
• The set $\mathbb{P}$ is not an $F_\sigma$-set in the real line.
•... | {
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"openwebmath_score": 0.995428204536438,
"tags": n... |
concurrency, mutual-exclusion
And then the theorem: "Read/Write registers have consensus number 1".
I guess I am missing something in my understanding of the definitions. Shared memory is an array of atomic registers, right? And Wikipedia says Dekker's algorithm is deadlock and starvation free. So how is that possible... | {
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ros
Originally posted by 130s with karma: 10937 on 2014-09-11
This answer was ACCEPTED on the original site
Post score: 0
Original comments
Comment by Aarif on 2014-09-12:
Thank you very much for answering my question but here is one more questions: Which package should i use to connect to USARSim through ROS-Indigo.... | {
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sums of its Taylor series. Lec 91 - Euler's Formula and Euler's Identity. (See why we want to do this in the Introduction. 2c: By applying the ratio test, find the radius of convergence for this Maclaurin series. Taylor's expansion, and the related Maclaurin expansion discussed below, are used in approximations. Taylor... | {
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"openwebmath_score": 0.9073213934898376,
... |
performance, beginner, c, programming-challenge, primes
There's nothing wrong with trial division as such, as long as you find it fast enough for your purposes. Had the Euler problem description asked for the 100,000,001st prime then things would look different, though, and you'd need a lot of patience for approaches ... | {
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"tags": "performance, beginner, c, programming-challenge, primes",
"url": null
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Optimization This solution has exponential run-time complexity in the size of the array, therefore I was asking myself how to optimize it. The only idea I have is to backtrack (i.e., don't continue the calculation for a given case), whenever the partial sum becomes negative (see commented out line (1) in the pseudo cod... | {
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"lm_label": "1. YES\n2. YES",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9752018398044143,
"lm_q1q2_score": 0.8269397161914844,
"lm_q2_score": 0.8479677564567913,
"openwebmath_perplexity": 789.9209471613511,
"openwebmath_score": 0.7057743668556213,
"tag... |
quantum-mechanics, hilbert-space, quantum-states
In fact, for systems with finitely many degrees of freedom there is only one, up to unitary equivalence, irreducible representation of the algebra of canonical commutation relations (this is the so-called Stone-von-Neumann theorem). Now since every pure state yields an ... | {
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"tags": "quantum-mechanics, hilbert-space, quantum-states",
"url": null
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java, hash-map, audio, morse-code
Complete the Morse alphabet with more punctuation and international characters.
Create a MidiMorsePlayer which would use MIDI instead of samples for playing the Morse code.
Make multiple Morse alphabets available, with M.1677 being the default.
Create a MorseSoundDecoder which takes s... | {
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"tags": "java, hash-map, audio, morse-code",
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q =v =kv k i i i endM2AA3, Orthogonality Dr Robert Nurnb erg m (a) In the lectures we showed that cgs outputs orthonormal vectorsq ; q ;:::;q 2R ; 1 2 n that is, the matrix mn T Q (q q q )2R is such that Q Q =I; 1 2 n nn where I2R is the identity matrix. m Show, by induction, that mgs outputs vectors q ; q ;:::... | {
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"lm_q1q2_score": 0.816193944455738,
"lm_q2_score": 0.8311430562234877,
"openwebmath_perplexity": 1811.3209981766672,
"openwebmath_score": 0.915378987789154,
"tags":... |
newtonian-mechanics, general-relativity, gravity, black-holes, speed-of-light
Title: Can a body ever experience acceleration this strong? Using the Schwarzschild radius formula, I approximated the Sun's Schwarzschild radius to be $3\text{ km}$. Now assuming I have a body (not a human body) which is at a distance of $1... | {
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... |
ros, rplidar, 2dlaserscan
Power problem
it looks power problem about my rplidar.
i used 5V/1A power connect. but when i see CPU monitor, i think it was lack about using RPlidar
so i connect power-supplied USB 3.0 hub with RPlidar.
add 2 lines of command
when i use rplidar i always insert 2 lines of command
$ source... | {
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ros, ros-kinetic, sicktoolbox-wrapper
Originally posted by BuilderMike on ROS Answers with karma: 247 on 2018-07-19
Post score: 0
To make everything work, follow all the steps up to step 8 (and including step 8) in the question above. Then run these two commands:
$ rosdep install sicktoolbox rviz
$ rosmake sicktoolbo... | {
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classification), you can use it in variational inference to approxim. • KL(q||p) ¸ 0 with equality iff p(x) = q(x). 1 Kullback-Leibler Divergence In order to nd the setting of the parameters that makes our approximation q closest to the posterior distribution, we need nd a way to measure the closeness of two distributi... | {
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"tags": ... |
# How to calculate $\lim_{x\to\infty}\frac{x}{x-\sin x}$?
I tried to solve $$\lim_{x\to\infty}\frac{x}{x-\sin x}.$$
After dividing by $x$ I got that it equals to: $$\lim_{x\to\infty}\frac{1}{1-\frac{\sin x}{x}}.$$ Now, using L'hopital (0/0) I get that $$\lim_{x\to\infty}\frac{\sin x}{x} = \lim_{x\to\infty}\cos x$$ an... | {
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"lm_q2_score": 0.8615382040983515,
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"openwebmath_score": 0.9998226761817932,
"tag... |
of polar coordinates #33-38. Cylindrical and spherical coordinates Recall that in the plane one can use polar coordinates rather than Cartesian coordinates. First there is ρ. To specify points in space using spherical-polar coordinates, we first choose two convenient, mutually perpendicular reference directions (i and ... | {
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"lm_q1q2_score": 0.8432972016158118,
"lm_q2_score": 0.853912747375134,
"openwebmath_perplexity": 486.12006461400983,
"openwebmath_score": 0.9364537000656128,
"tags":... |
Subtopics. To make circular convolution equal to standard convolution, the sequences are zero-padded and the result is trimmed. I Convolution of two functions. , if signals are two-dimensional in nature), then it will be referred to as 2D convolution. Convolution is the treatment of a matrix by another one which is cal... | {
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"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9877587239874877,
"lm_q1q2_score": 0.8231236471102209,
"lm_q2_score": 0.8333246035907932,
"openwebmath_perplexity": 817.352576756788,
"openwebmath_score": 0.8224692344665527,
"tags... |
electromagnetism, electrical-resistance, capacitance
$$\nabla \cdot (\sigma \nabla \psi) = 0 \tag{5}$$
Apparently the two potentials, the electrostatic $\phi$ and the stationary current $\psi$ satisfy the same partial differential equation if we identify the permittivity $\epsilon$ in (2) with the conductivity $\sigma... | {
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"url": null
} |
c, random, assembly
also use switch case with flat logic integer primitives, enums, etc
reels should probably be enums, as they only cover a certain range as well, this fits well with switch case.
Finally you might want to split things up more in this function to make it more readable.
Rename cls to clearScreen beca... | {
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php, array, json
The same goes for bindParam(). You don't need to re-bind the params each loop iteration-- once bound, they're bound. bindParam() binds by reference, the actual evaluation of the param happens every time execute() is called.
So let's do this minor refactor. We prepare the statement and bind the params ... | {
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"tags": "php, array, json",
"url": null
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