text stringlengths 1 1.11k | source dict |
|---|---|
respiration
Note 2: Please see this other similar StackExchange post here:
https://physics.stackexchange.com/questions/2605/how-does-mass-leave-the-body-when-you-lose-weight Yes, they are mostly exhaled. The carbon, hydrogen and oxygen that the fats are made of recombine to become $CO_2$ and $H_2 O$ and are exhaled.
... | {
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physical-chemistry, nmr-spectroscopy
* As long as the Hamiltonian doesn't change. But if you change the Hamiltonian, say from $\hat{H}_0$ to $\hat{H}_1$, then the eigenstates change, and so your system (which was originally an eigenstate of $\hat{H}_0$ is no longer an eigenstate of $\hat{H}_1$). Indeed, it would be in... | {
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} |
java, project-euler, java-8
But, I thought, "I always complain about people using autoboxing instead of primitives... surely the Streams API has primitive processing options?", and, when I looked, it does! So, I converted your code to use IntStream and other Int* constructs, instead of Stream<Integer>. This has helped... | {
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} |
string-theory, supergravity, kaluza-klein
The 256 massless degrees of freedom of eleven dimensional supergravity descend to the ten dimensional type IIA supergravity massless multiplet after compactification.
The circle compactification produce new massive states. Namely the type IIA dilaton $\phi$ descending from $g_... | {
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Can someone kindly explainthe underlined portion?
For such kind of graphic questions you MUST post the image. Next, please also do check the OA's when posting a question, OA for this one is C, not E.
Original question is below:
If angle BAD is a right angle, what is the length of side BD?
(1) AC is perpendicular to... | {
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fft, python
yf, xf = fft(y)
def aWeighting(yf, xf):
f1 = 20
f2 = 107
f3 = 737
f4 = 12194
N = len(xf)
i = 0
yfa = []
while i < N:
a = 20.0 * np.log10((f4 ** 2 * xf[i] ** 4) / ((xf[i] ** 2 + f1 ** 2) * np.sqrt(xf[i] ** 2 + f2 ** 2) * np.sqrt(xf[i] ** 2 + f3 ** 2) * (xf[i] ** 2 + ... | {
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quantum-mechanics, many-body
I'll pretend that electrons have spin $0$, so the field operators don't need a spin index.
I'll treat the magnetic field as a time-independent external field, expressed in terms of a gauge field $\mathbf{A}(\mathbf{x})$. | {
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complexity-theory, time-complexity, selection-problem, precedence-graph
I tried to find a reduction from CLIQUE or 3-Dimensional Matching, but I couldn't.
Thank you in advance :) If you flip the signs on your costs and reverse edge directions, this is the Closure Problem, also known as the Open-Pit Mining Problem, and... | {
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"tags": "complexity-theory, time-complexity, selection-problem, precedence-graph",
"url": null
... |
swift, graphics, uikit
Next thing I see that bothers me is the scattering of different types of class members.
You have a handful of properties, then randomly drawRect, then another property, then a handful of methods, and then all of a sudden, you have a nested enum, then still more methods.
And what's worse, there a... | {
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performance, sorting, assembly
the 3rd iteration of the outerloop (CX=2) has to do 2 compares in the innerloop
the 4th iteration of the outerloop (CX=1) has to do 1 compare in the innerloop
In your code you have initialized the outerloop counter correctly but you should see that the current value of the outerloop coun... | {
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to Convex Hull Applications – 6th February 2007 computer visualization, ray tracing (e.g. For-Loops, 1.5 911 The gift wrapping algorithm is typically used for finding the convex hull in a higher dimensional space. The convex hull of a set $X$ of points is the smallest convex set that contains $X$. The same method is mo... | {
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"tags": nul... |
beginner, go, server, raspberry-pi, video
expectedID = 1
collector = collector[:0]
continue
}
log.Println("INCOMPLETE FRAME")
}
expectedID = 1
collector = collector[:0]
}
}()
wg.Wait()
} Readab... | {
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3. $K$ cannot contain any point of the open ball $B_{1+\delta}(x)$, because otherwise there would be a point in $\bar B_\delta(x)$ with distance to $K$ smaller than 1. But, then $x$ would have distance larger then $1$ to $K$, i.e. $x\not\in A$, contrary to the assumption that $\bar B_\delta(x)\subset A$.
A possible re... | {
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slam, navigation, amcl
Originally posted by Procópio with karma: 4402 on 2016-11-08
This answer was ACCEPTED on the original site
Post score: 3
Original comments
Comment by MarkyMark2012 on 2016-11-14:
So if I have an existing map, where the environment of which might change then SLAM so that it can localise then upd... | {
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for the Unit 6 Test. Jun 21 2020 practice-8-exponential-growth-and-decay-answers 1/5 PDF Drive - Search and download PDF files for free. Return to Exercises. Consider the exponential decay (or growth) equation (encountered in radioactive decay, unchecked population growth (or decay): 𝑑𝑢/𝑑𝑡 = 𝑎𝑢 𝑢(0) = 1 (a) Disc... | {
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"openwebmath_score": 0.5381872057914734,
"tags": ... |
ros, catkin-make, catkin, packages
Originally posted by Akif with karma: 3561 on 2017-02-16
This answer was ACCEPTED on the original site
Post score: 1 | {
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With that, our contour integral above is just $$\int_\gamma f_1dx - f_2dy + i \int_\gamma f_1 dy + f_2 dx = \int_\gamma \partial_x F_1 dx - \partial_x F_2 dy + i \int_\gamma \partial_x F_1 dy + \partial_x F_2 dx$$Now we use the Cauchy-Riemann equations, which just say that $dF$ looks like a scaled rotation matrix, sinc... | {
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evolution, population-genetics
Those equations can be found in any introductory courses in population genetics. For example, here is a source where you can find this same equation for diploid selection. They just express $q$ instead of $1-p$.
My questions are: | {
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javascript, jquery, animation
Click
Delay start of animation based on data-delay
Loop animation twice with left or right set from data-right It would be nice if there was a JsFiddle to go along with this. Below is the code you posted refactored to utilize event delegation so you don't need to repeat the click handlers... | {
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• For every one of the $6$ choices you have from the first box, you have $6$ choices for what you take from the second box, so we need to take the product, not the sum. You have not answered the quesition of whether each box has the same number of balls. If they do, the answer is quite simple. If they don't, it is sign... | {
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"openwebmath_score": 0.9147997498512268,
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javascript, game, minesweeper
In this case I'd go with the first, though, since instead of placing mines and then iterating through all the tiles, you can simply update the surrounding tiles when you place a mine.
This isn't a complete implementation, just a few highlights you might find useful:
// create a 2D array o... | {
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16:20. Learn more about Frequency Polygon here. This gives a somewhat rounded nose regardless of the sharpness ratio. Two pointed arch vault system was built inside the Bhitargaon temple as noted by Alexander Cunningham, which is dated to early Gupta period of 4th–5th century CE. Another common ogive for bullets is the... | {
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"lm_q2_score": 0.8539127492339909,
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"openwebmath_score": 0.5637276768684387,
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c#, performance, .net, playing-cards
Then create a simple wrapper around the outermost loop of your code:
public static Counters CalculateHands()
{
Stopwatch sw = new Stopwatch(); // Stopwatch code doesn't belong here...
sw.Start();
// Declare array to hold computed sums
var results = new Counters[51 ... | {
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c++, optimization, algorithm, memoization
// Number of times each spot is hit with recursion
1
1 1
1 2 1
1 3 3 1
1 4 6 4 1
As you can see some of the spots in the center bottom of the triangle are being hit many many times by recursion when you only want to hit each location once. Thus an iterative solution is probab... | {
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c++, multithreading, c++20
Make it more generic
Your function requires that the payloads are stored in a std::vector. However, what if you had them in a std::list instead? Or a std::deque, or any other type of container? The only thing you care about is that you can iterate over the range of payloads. So consider writ... | {
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schroedinger-equation, time-evolution, reversibility, unitarity, time-reversal-symmetry
$$
\frac{d}{dt}(x, z) = (z, 0)
$$
i.e.:
$$
\frac{d}{dt}(x, z)^\top = \begin{bmatrix}0&1\\0&0\\\end{bmatrix}(x, z)^\top
$$
And now if we start at any $z$, we will get the same dynamics as before e.g. $z=1$ just gives us our previous... | {
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] = 10 fig = plt. (e) Write a set of parametric equations of a line that has explicit equation y = (–5/4)x – 3 (There are many possible correct answers) (f,g,h) Parametric equations for a line are often linear equations of t, but not always If the parametric equations for x and y are linear equations of the same functi... | {
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The proof of the theorem is based on the following simple
Lemma. Let $R$ be a commutative domain, $P\in R[X]$, and $r\in R$ a root of $P$. Then there exists a (unique) $Q\in R[X]$ with $P=(X-r)Q$, and every root of $P$ other than $r$ is a root of $Q$. | {
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angular-momentum, astrophysics, orbital-motion, galaxies
So then, how is this a lower energy configuration? Well, we go into a Reddit AskScience thread, and use Astrokiwi's nice explanation at http://www.reddit.com/r/askscience/comments/ik4jj/during_spiral_galaxy_formation_how_does_gas/
To reduce the kinetic energy o... | {
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• Please describe what you've tried so far! – Xoque55 Dec 17 '15 at 1:37
• @Xoque55 : I am trying to prove by contradiction. That is, assuming that there is a countable generating set I am trying to prove that I am sure going to miss some singletons in the sigma algebra generated by this set. Since singletons are in th... | {
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cell-biology, virology, cell-division
In biology, "selection" often refers to natural selection -- in short, genetic diversity in a population manifests as different traits in individuals, which result in differences in relative fitness in a given environment that, through time, result in evolution. The quoted excerp... | {
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time-complexity, runtime-analysis, big-o-notation
For those who don't have access to plotting software, you can evaluate the slope of the tangent line for an arbitrarily large n-value:
$$ O_1'(10^6)=\frac{d}{dn} n^2log(n)\bigg|_{n=10^6} = 10^6 + 2(10^6) × log(10^6) ≈ 2.8631 × 10^7$$
$$ O_2'(10^6)=\frac{d}{dn} n^{2.32}... | {
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# Can someone clearly explain about the lim sup and lim inf?
Can some explain the lim sup and lim inf? In my text book the definition of these two is this.
Let $(s_n)$ be a sequence in $\mathbb{R}$. We define $$\lim \sup\ s_n = \lim_{N \rightarrow \infty} \sup\{s_n:n>N\}$$ and $$\lim\inf\ s_n = \lim_{N\rightarrow \in... | {
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"openwebmath_score": 0.8666624426841736,
"tags... |
to the figure alongside, consider a beam loaded with uniformly distributed load of W per unit. The course covers shear force and bending moment diag. In this chapter, we seek to calculate the stress from bending which is caused by bending moments. then, the Shear Stress Distribution is given by: () ()()() ()It VQ It y ... | {
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"openwebmath_score": 0.6744881868362427,
... |
quantum-mechanics, quantum-information, quantum-entanglement, decoherence, coherence
$$ C(\lvert \alpha \rangle \langle \alpha \rvert) = C(D(\alpha)\lvert 0 \rangle \langle 0 \rvert D^\dagger(\alpha)) = C(\lvert 0 \rangle \langle 0 \rvert ). $$
Therefore $C(\rho)$ is a rather poor measure, as it assigns the same amoun... | {
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"tags": "quantum-mechanics, quantum-information, quantum-entanglement, decoherence, coheren... |
physical-chemistry, quantum-chemistry, molecular-orbital-theory
Title: How does molecular orbital overlap affect energy? If there is more overlap of the same sign wave function, this apparently leads to lower energy. I don't understand why. My professor said that there would be fewer nodes, and fewer nodes means lower... | {
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"tags": "physical-chemistry, quantum-chemistry, molecular-orbital-theory",
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• The term "enclosed" is widely used in textbooks when talking about regions bounded by two curves, but I have never seen a textbook give an explicit definition of the term. There is a common mathematical concept of a "closed curve" which is a curve in the plane which begins and ends at the same point. So one could def... | {
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"id": null,
"lm_label": "1. YES\n2. YES",
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"lm_q1_score": 0.9830850832642353,
"lm_q1q2_score": 0.889348448520097,
"lm_q2_score": 0.9046505370289057,
"openwebmath_perplexity": 179.13640707947349,
"openwebmath_score": 0.8685263991355896,
"tag... |
kinematics, reference-frames, acceleration, universe, relative-motion
So if the universe had only one object together with the metric field, then the distinction between accelerating (non-weightless) and inertial ( = free-fall = weightless) would still be meaningful, at least if classical general relativity is used as... | {
"domain": "physics.stackexchange",
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"tags": "kinematics, reference-frames, acceleration, universe, relative-motion",
"url": n... |
quantum-field-theory, feynman-diagrams, graph-theory
$$\int\hat\phi(p_1)...\hat\phi(p_N)\prod\limits_{j\in A}\prod\limits_{i=1}^{d_j}\hat\phi\left(k_i(j)\right) d\mu,$$
where $k_i(j)$ are momentum variables carried by half-line associated to $\xi_j$.
In the Green's (or rather Schwinger - because we done Wick's rotatio... | {
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"openwebmath_score": null,
"tags": "quantum-field-theory, feynman-diagrams, graph-theory",
"url": null
} |
rviz, ros-kinetic, transform
ros::spinOnce();
}
return 0;
}
The program returns me this transformation:
Transform: -0.131564, 0.80858, -0.20301, 0.640242, -0.279677, -0.16726
and in rviz: Absolute Position and Orientation: 0.61686, 0.10287, 0.57003, -0.64024, 0.27968, 0.16726
My question is, is it supposed to... | {
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"id": 31548,
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"openwebmath_score": null,
"tags": "rviz, ros-kinetic, transform",
"url": null
} |
organic-chemistry, synthesis, enzymes
Title: How is NADH or NADPH produced in industrial chemical synsthesis? I am trying to find out how NADH or NADPH are produced in bulk. These molecules are very important biologically, however, they are also sold as chemical reagents and produced in large quantities. How are these... | {
"domain": "chemistry.stackexchange",
"id": 17173,
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"tags": "organic-chemistry, synthesis, enzymes",
"url": null
} |
c++, ai, sfml, connect-four
At the very least, I would expect a class Board that represents a Connect 4 board, with member functions that allow you to query and change the state of the board. A class Game for the game itself, that not only contains the board but also keeps track of who is playing, and allows you to qu... | {
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"tags": "c++, ai, sfml, connect-four",
"url": null
} |
java, programming-challenge, array, hash-map
Explanation:
I've created a map where I stored count 1 for each element in the range 1 to K (including K). After that I'm traversing the actual array and whenever I encounter an element which is there in the map, I reduce the value by 1 and reducing the count variable by 1 ... | {
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"tags": "java, programming-challenge, array, hash-map",
"url": null
} |
Thank you very much in advance.
-
While the process suggested by the book and fleshed out by Arturo is probably the nicest way to solve the problem, there is nothing wrong with your original thought. Find a polynomial of degree 6 satisfied by $\sqrt2+\root3\of4$, prove that it's irreducible, then those powers you wrot... | {
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"lm_label": "1. YES\n2. YES",
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"lm_q1_score": 0.9790357628519819,
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"lm_q2_score": 0.8289388146603365,
"openwebmath_perplexity": 145.8034770659341,
"openwebmath_score": 0.9276941418647766,
"tag... |
c, interpreter, brainfuck
int run() {
int ip;
for(ip = 0; ip>=0 && ip<progsize; ip++)
switch(prog[ip]){
case '>': ++ptr; break;
case '<': --ptr; break;
case '+': ++*ptr; break;
case '-': --*ptr; break;
case '.': putchar(*ptr); break;
case ',': *ptr=getcha... | {
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"tags": "c, interpreter, brainfuck",
"url": null
} |
(BaseEstimator, ClassifierMixin): """Quadratic Discriminant Analysis A classifier with a quadratic decision boundary, generated by fitting class conditional densities to the data and using Bayes' rule. Next we plot LDA and QDA decision boundaries for the same data. Suppose we collect data for a group of students in a s... | {
"domain": "tuningfly.it",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9843363517478327,
"lm_q1q2_score": 0.8386081185009281,
"lm_q2_score": 0.8519528076067262,
"openwebmath_perplexity": 1224.9299710586267,
"openwebmath_score": 0.6168559193611145,
"tag... |
Line Formula is called an Average rate of change. However, the reciprocal functions (secant, cosecant and cotangent) can be helpful in solving trig equations and simplifying trig identities. These six ratios are useful in different ways to compare two sides of a right triangle. Select One A. described as a generalizati... | {
"domain": "almodarresi.com",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.9850429147241161,
"lm_q1q2_score": 0.8292343814402398,
"lm_q2_score": 0.8418256393148982,
"openwebmath_perplexity": 541.3095723636754,
"openwebmath_score": 0.8611409664154053,
"t... |
botany, entomology, ecology, database, data
European Forest Institute Database
EFI is running a number of online databases with data and information on different aspects of European forests, forestry and forest research.
CTFS-ForestGEO
The Center for Tropical Forest Science - Forest Global Earth Observatory (CTFS-Fore... | {
"domain": "biology.stackexchange",
"id": 5006,
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"tags": "botany, entomology, ecology, database, data",
"url": null
} |
javascript, jquery
333 in your mousemove handler is magic, perhaps it should be pos[pos.length-1]?
I'm not going to comment on jQuery plug-in style (I don't use jQuery) or your implementation of a "form slider" (which I assume is an implementation of an HTML5 input range).
Hopefully this was useful! | {
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python, database, django
Title: Django query filter on count in one to many relation I have the following models:
class Donation(models.Model):
donation_amount = models.DecimalField(max_digits=9, decimal_places=2)
donor_name = models.CharField(max_length=200)
class Charge(models.Model):
donation = models.... | {
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"tags": "python, database, django",
"url": null
} |
general-relativity, metric-tensor, gravitational-waves
$$
n^\mu = e^{-2\beta} \frac{\partial x^\mu}{\partial r} . \tag{2}
$$
Until this point, the definitions were completely general and are applicable in any spacetime. Note that $r$ is an arbitrary choice of parameterization so we can choose it however we want. For i... | {
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"openwebmath_score": null,
"tags": "general-relativity, metric-tensor, gravitational-waves",
"url": null
} |
quantum-field-theory, condensed-matter, perturbation-theory, large-n
[1] https://arxiv.org/abs/1807.03334
[2] http://www.staff.science.uu.nl/~hooft101/gthpub/planar_diagram_theory.pdf
[3] https://arxiv.org/abs/1512.06784 From the practical point of view, the underlying principle of any large $N$ analysis is the same:... | {
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"tags": "quantum-field-theory, condensed-matter, perturbation-theory, large-n",
"url": nu... |
cc.complexity-theory, counting-complexity, gt.game-theory
I also know that for PLS's cousin PPAD, [CS02] shows that counting the number of Nash equilibria is #P-hard. This suggests that similar PLS problems like counting the number of pure-strategy equilibria in congestion games, would also be hard.
References
[CS02] ... | {
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"tags": "cc.complexity-theory, counting-complexity, gt.game-theory",
"url": null
} |
units
Title: Convert pg/mL to/from pmol/L? In this article, 148 pmol/L is said to be equivalent to 200 pg/mL.
But this unit conversion site says that 200 pg/mL are equivalent to ~734 pmol/L, and this one gives 44 pmol/L for the same value.
What am I missing here? What is the correct way to perform this conversion, and... | {
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python, gui, tkinter, matplotlib, sympy
# execute main loop on base instance
root.mainloop()
Again I would like to thank any advice and criticisms offered up in advance! There are a lot of PEP 8 issues in your code. I recommend reading through that document.
It is recommend to avoid using eval, as it makes your code... | {
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"tags": "python, gui, tkinter, matplotlib, sympy",
"url": null
} |
gazebo
Title: Gazebo simulation stopping after some time while using reinforced learning
Hi, I encounter a problem while using the gym-gazebo package. After running the example simulations the simulation ...pauses? The issue is like the ones described in issue 49 and issue 47, but the fix provided in issue 47 (reinst... | {
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"tags": "gazebo",
"url": null
} |
graphs, Johnson's algorithm has a lower asymptotic running time compared to Floyd-Warshall. When we are done considering all of the neighbors of the current node, mark the current node as visited and remove it from the unvisited set. A visited node will never be checked again. Dijkstra's algorithm for undirected graphs... | {
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"lm_q1_score": 0.9693241965169938,
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"lm_q2_score": 0.899121379297294,
"openwebmath_perplexity": 979.0421805705263,
"openwebmath_score": 0.3389943540096283,
"tags": null,
... |
forces, pressure, vectors, fluid-statics
Title: If force is a vector, then why is pressure a scalar? By definition pressure is the perpendicular force applied to a unit area. So it has a direction which is perpendicular to the area. So it should be a vector. But I did sone googling and found out that it is a scalar qu... | {
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"tags": "forces, pressure, vectors, fluid-statics",
"url": null
} |
2. Given an arbitrary complex vector $$(\alpha,\beta)\in\mathbb C^2$$, you can get the corresponding vector in the Bloch sphere via the mapping (more precisely, this is a bijection $$\mathbb{CP}^1\to S^2$$): $$\begin{pmatrix}\alpha\\\beta\end{pmatrix} \longleftrightarrow \begin{pmatrix}2\operatorname{Re}(\bar\alpha\bet... | {
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"lm_q1_score": 0.9615338112885302,
"lm_q1q2_score": 0.8191814192930045,
"lm_q2_score": 0.8519527963298946,
"openwebmath_perplexity": 437.9076632760903,
"openwebmath_score": 0.998477041721344,
"tags... |
java, swing, snake-game
Title: Snake Game with Swing I put my code below to ask you for a review and ask you if this can be considered a good and clean code?
The game works just fine, I have encountered one issue though - the Food condition to not to create new food on current snake position is not working, and to be ... | {
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%% Convert the 16-Port to 4-Port S-Parameters %% Calculate the Frequency Response. Now I have an input signal that is 3 seconds long at 48k samples/second. Desired length of the baseband-equivalent impulse response for the physical model. Real and imaginary part of the frequency response for this frequency. In these tu... | {
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"lm_q1_score": 0.9539660949832346,
"lm_q1q2_score": 0.8108436814776405,
"lm_q2_score": 0.8499711737573762,
"openwebmath_perplexity": 1101.8294530208088,
"openwebmath_score": 0.6673231720924377... |
artificial-intelligence, search-problem
In the context of a map program trying to get to somewhere I do understand the state might be In(New York) but I what I am struggling with is how I would represent something like that in code, or perhaps a maze where the current state might be the x, y coordinate of the square t... | {
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"tags": "artificial-intelligence, search-problem",
"url": null
} |
vba, excel
Title: VBA code that compares 2 sheets from different systems In this code looking at 2 worksheets that contain similar data from different systems. Column 1 contains a unique staff number so there can be a match on the person then here there is a difference in NiNo ws1.cell(,17) and ws2.cell(,24)(This crit... | {
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"openwebmath_score": null,
"tags": "vba, excel",
"url": null
} |
quantum-gate, quantum-state, circuit-construction, quantum-fourier-transform
Title: Is it possible to modify the QFT circuit to use only 1-qubit gates? [Measured Quantum Fourier Transform]
I've recently learned the Quantum Fourier Transform, and was shown its circuit.
The circuit I've seen is composed of Hadamard gate... | {
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"tags": "quantum-gate, quantum-state, circuit-construction, quantum-fourier-transfo... |
Substitute 1 into 2 to get instantaneous power through a resistor in terms of voltage or current: $$3: P(t) = I^2(t)R = \frac{V^2(t)}{R}\\$$
Average power is definitionally the integral of instantaneous power over a period, divided by that period. Substitute 3 into that to get average power in terms of voltage and cur... | {
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"lm_q2_score": 0.8175744695262775,
"openwebmath_perplexity": 557.8185042846745,
"openwebmath_score": 0.8617863059043884,
"tag... |
electronic-configuration, oxidation-state
Does this have to do with the ionization energy, the energy level, or...? This is yet another interesting effect of the anomalous compactness of orbitals in the first appearance of each type of subshell ($1s$, $2p$, $3d$, $4f$, $5g$, etc). The solutions to the Schrödinger equa... | {
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"tags": "electronic-configuration, oxidation-state",
"url": null
} |
quantum-field-theory, potential, symmetry-breaking
More physically, $\phi$ in situation A describes the physical state that a system is in, while in B $\phi$ is the dynamical variable in some field theory: you can obtain physical states in this theory by, for example, quantizing this theory, deriving creation/annnihil... | {
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"tags": "quantum-field-theory, potential, symmetry-breaking",
"url": null
} |
mathematical-software
Title: How do Computer Algebra Systems work? In Computer Architecture course, I have learnt how computer performs numerical computations.
While using MATLAB, I was introduced to symbolic mathematics toolbox.
I was amazed to see it manipulating trigonometric expressions, indefinite integration etc... | {
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"tags": "mathematical-software",
"url": null
} |
turing-machines, automata, finite-automata
Title: Deterministic finite automata that accepts the only the string "aabb" Lets construct a DFA over{a,b} That accepts only the string "aabb" in it.
My problem with this video is that the tutor has
moved arrow from state D to B why didn't he set a self loop on D .Im really... | {
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"tags": "turing-machines, automata, finite-automata",
"url": null
} |
ros, pcl, source, package, ros-groovy
Linking CXX shared library
../lib/libpcl_io_ply.so
[ 4%] Built
target pcl_io_ply
make: *** [all]
Error 2
<== Failed to process package 'pcl':
Command
'/opt/ROS/ros_catkin_ws/devel_isolated/nodelet_topic_tools/env.sh
make -j8 -l8' returned non-zero exit
status 2
Reproduce th... | {
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"tags": "ros, pcl, source, package, ros-groovy",
"url": null
} |
javascript, object-oriented, game, html5, canvas
const center = this.bricks[0];
for (let i = 0; i < 3; ++i) {
this.bricks[i + 1].x = center.x + oriented[i][0] * brickSize;
this.bricks[i + 1].y = center.y + oriented[i][1] * brickSize;
}
return this;
... | {
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"tags": "javascript, object-oriented, game, html5, canvas",
"url": null
} |
machine-learning, game-ai, applications, reference-request
Acquisition of the current state of the game
Control over execution of move options
Intercommunication with other players
Models related to the game
Execution engine for applying these
The models are as follows for a CS:GO aimbot.
Model of game players
Model... | {
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"tags": "machine-learning, game-ai, applications, reference-request",
"url": null
} |
newtonian-mechanics, spring, elasticity
Title: Spring Potential energy conversion Picture this...
I take an elastic band, similar to one that people use to work out. Much larger than a rubber band.
My friend has lost a bet and I decide that his punishment is for me to put the band around his waist, take a few steps ba... | {
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"tags": "newtonian-mechanics, spring, elasticity",
"url": null
} |
cellular-respiration, respiration
Now, pyruvic acid has the formula: $CH_3-CO-COOH$. So, if you look at the step C of reaction, then since CH3CO- has been added to coenzyme A, hence, in a way, it would be considered an acetylation reaction. Pay attention that the complete reaction will not be considered acetylation, o... | {
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"openwebmath_score": null,
"tags": "cellular-respiration, respiration",
"url": null
} |
cc.complexity-theory, complexity-classes, circuit-complexity, proof-complexity, uniformity
(Some ideas goes back to Steve'e original paper "Feasibly Constructive Proofs and the Propositional Calculus" from 1975 paper).
One can define other types of uniform proofs between these two, but it is not clear what you are as... | {
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"tags": "cc.complexity-theory, complexity-classes, circuit-complexity, proof-complexity, un... |
ros, occupancy-grid
Title: map_msgs/GetMapROI
what does ROI mean? Can someone link me to something that points out how this is used? I see it has an OccupancyGrid in it. I'm looking for a little direction. Any help would be appreciated. Thanks.
Originally posted by david.c.liebman on ROS Answers with karma: 125 on 2... | {
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"openwebmath_score": null,
"tags": "ros, occupancy-grid",
"url": null
} |
phase, infinite-impulse-response, delay
$$\tau_p(\omega)=-\frac{φ(\omega)}{\omega}$$
Therefore the final equation for phase delay for any normalized angular frequency ω would be:
$$\tau_p(\omega)= \frac{-atan2(n,m) + atan2(q,p)}{\omega}$$
(Updated from Matt L's feedback.) You almost got it, but the final result is wro... | {
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"openwebmath_score": null,
"tags": "phase, infinite-impulse-response, delay",
"url": null
} |
lambda-calculus, type-theory, type-checking, haskell
Title: How does GHC insert type abstraction/application under the RankNTypes extension I'm developing a functional programming language that offers Rank-n polymorphism. Like Haskell I don't want types to appear at the term level, but I have no idea to insert type ab... | {
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"id": 20399,
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"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "lambda-calculus, type-theory, type-checking, haskell",
"url": null
} |
double-slit-experiment, identical-particles
Title: Double slit: how identical is identical? It works even with C60 molecules...
The authors of the above article already wrote in the abstract: "Of particular interest is the fact that C60 is almost a classical body, because of its many excited internal degrees of freedo... | {
"domain": "physics.stackexchange",
"id": 98486,
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"openwebmath_score": null,
"tags": "double-slit-experiment, identical-particles",
"url": null
} |
electromagnetism, magnetic-fields
$
\mu_r = \frac{\mu}{\mu_0} ≈ 1 \pm 10^{-5}
$.
I don’t know of a good fundamental explanation for this. It may be related to the fact that magnetic transitions are generally weaker/slower than electric transitions which carry the same angular momentum. For example, an atomic or nuclea... | {
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"tags": "electromagnetism, magnetic-fields",
"url": null
} |
python, beginner, algorithm, python-3.x, comparative-review
Title: Finding the longest substring in alphabetical order I wrote code in Python that takes a string s as input and determines the longest substring of s that’s in alphabetical order. In the case where there are two strings of the same length, code outputs t... | {
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"openwebmath_score": null,
"tags": "python, beginner, algorithm, python-3.x, comparative-review",
"url": null
} |
javascript, html, css
<!DOCTYPE html>
<html lang='eng'>
<head>
<title>FITIFY | Fitness Tracker</title>
<!--CSS Styling-->
<style>
h1{
color: gold;
font-family: 'Open Sans', sans-serif;
font-weight: bolder;
}
h2, h3{
color: whi... | {
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"openwebmath_score": null,
"tags": "javascript, html, css",
"url": null
} |
# The roots of the equation $x^2+3x-1=0$ are also the roots of $x^4+ax^2+bx+c=0$
The roots of the equation $x^2+3x-1=0$ are also the roots of quartic equation $x^4+ax^2+bx+c=0$. Find $a+b+4c$.
This problem is from yesterday's Bangladesh National Math Olympiad 2017. I tried this using Vieta Root Jumping but no luck. A... | {
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"lm_q1_score": 0.9822877012965886,
"lm_q1q2_score": 0.8480989581534953,
"lm_q2_score": 0.8633916082162402,
"openwebmath_perplexity": 312.81510198185174,
"openwebmath_score": 0.8503551483154297,
"ta... |
ros
Originally posted by rosmaker on ROS Answers with karma: 51 on 2012-06-16
Post score: 0
I am not completely sure, but from what I could understand, the registered data matches the depth information and relates to the RGB camera.
By taking a look at the /camera/depth_registered/disparity we can see that it is sl... | {
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"openwebmath_score": null,
"tags": "ros",
"url": null
} |
electricity, antimatter
Title: Can positrons flow through matter or antimater or both? Now, I know that a flow of positrons can constitute electricity. But my question is whether positrons can flow through matter conductors like copper or only antimatter conductors. There should be no difference between the flow of el... | {
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"id": 87415,
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "electricity, antimatter",
"url": null
} |
python, performance, pandas
The join here accomplishes the task of connecting the files that have already been backed up with those in filelist; the second line selects out only those files whose current version is greater than the one that was stored previously, and the third line actually performs the update (again,... | {
"domain": "codereview.stackexchange",
"id": 18514,
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"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "python, performance, pandas",
"url": null
} |
computability, turing-machines, proof-techniques, recursion, primitive-recursion
Title: How to handle an undefined case with µ-recursive functions? How to construct my proof and generally what should I aim to get when showing a function is $\mu$-recursive? Should I transform it in some of the basic functions using the... | {
"domain": "cs.stackexchange",
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"lm_q1_score": null,
"lm_q1q2_score": null,
"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "computability, turing-machines, proof-techniques, recursion, primitive-recursion",
"ur... |
quantum-mechanics, homework-and-exercises, operators, commutator, anticommutator
Title: Properties of anticommutators Do anticommutators of operators has simple relations like commutators.
For example:
$$[AB,C]=A[B,C]-[C,A]B.$$
But I don't find any properties on anticommutators. Do same kind of relations exists for a... | {
"domain": "physics.stackexchange",
"id": 38501,
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"openwebmath_score": null,
"tags": "quantum-mechanics, homework-and-exercises, operators, commutator, anticommutator",... |
ros
</gazebo>
</robot>
This file is present in the /usr/share/drcsim-1.3/models/hubo_leg/ directory and the name of the file is model.urdf
I have a hubo_leg_pkg. which has 3 launch files :
The 1st launch file is hubo_leg.launch (present is the package hubo_leg/launch/)
<launch>
<arg name="gzname" default="gazebo"/... | {
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"tags": "ros",
"url": null
} |
botany, ecology, plant-physiology
Title: What happens when you take a deciduous tree and place it in a climate controlled greenhouse? The greenhouse would have stable level of light, (matched with day/night wavelength brightness changes like outside the greenhouse), humidity and temperature.
Do certain processes in th... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
"openwebmath_score": null,
"tags": "botany, ecology, plant-physiology",
"url": null
} |
c#
/// <summary>
/// A constructor of a Pin.
/// </summary>
/// <param name="value">
/// The initial value of the new Pin.
/// </param>
/// <param name="code">
/// The initial code of the new Pin.
/// </param>
public Pin(PinValue value, string code)
: this(value)
{
... | {
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"lm_q2_score": null,
"openwebmath_perplexity": null,
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"tags": "c#",
"url": null
} |
java, beginner, swing, connect-four
}
/**This function is used to return the integer version of the string entered in the text field.
*This function is called in the chooseAndDropGUI from the ConnectFour class.
*/
public int readPlayerInputForProcessing()
{
while(true)
{
int playerInputValue;
... | {
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"openwebmath_score": null,
"tags": "java, beginner, swing, connect-four",
"url": null
} |
physical-chemistry, viscosity
Viscosity is an expression of the resistance to flow of a system under an applied stress. The more viscous a liquid is, the greater is the applied force required to make it flow at a particular rate.
Viscosity is defined in terms of the force required to move one plane
surface past ano... | {
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"tags": "physical-chemistry, viscosity",
"url": null
} |
$\sum_{n=1}^{\infty}\frac{|a_n|}{n}$ $\leq$ $\frac{1}{2}$$\sum_{n=1}^{\infty} a_n^2 +\frac{1}{2}$$\sum_{n=1}^{\infty}\frac{1}{n^2}$
$\sum a_n^2$ and $\sum \frac{1}{n^2}$ are convergent. so by comparison test $\sum\frac{|a_n|}{n}$ is convergent. so $\sum \frac{a_n}{n}$ is convergent absolutely | {
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"openwebmath_perplexity": 562.8606977021676,
"openwebmath_score": 0.9294421076774597,
"tag... |
A graphical representation verifies the solution.
Another student recognized that if two parabolas shared a vertex, but had different “slopes”, their only possible point of intersection was exactly the one the question required. Here’s a graphical version of her answer.
From these two, you can see that there is actu... | {
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"lm_q1_score": 0.9852713848528318,
"lm_q1q2_score": 0.8294267154073537,
"lm_q2_score": 0.8418256412990657,
"openwebmath_perplexity": 931.0489525390027,
"openwebmath_score": 0.7766989469528198,
"tags": ... |
(Levenberg-Marquardt) calls a wrapper over least-squares algorithms implemented in MINPACK (lmder, lmdif). It turns out that there is one, at least one that I am happy with: Incremental Least Squares Curve Fitting. Nonlinear least squares is really similar to linear least squares for linear regression. This method reli... | {
"domain": "from.bz",
"id": null,
"lm_label": "1. YES\n2. YES\n\n",
"lm_name": "Qwen/Qwen-72B",
"lm_q1_score": 0.986151391819461,
"lm_q1q2_score": 0.8239132569964246,
"lm_q2_score": 0.8354835411997897,
"openwebmath_perplexity": 896.0800361771716,
"openwebmath_score": 0.7048426866531372,
"tags": nul... |
python, strings, parsing, regex
Currently, I am doing this using regex, with the following code (get_tokens is the main method):
import re
class Script:
def __init__(self, text):
self._tokens = Script.get_tokens(text)
def get_tokens(text):
""" Static tokenizer function.
Uses regex to ... | {
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"openwebmath_score": null,
"tags": "python, strings, parsing, regex",
"url": null
} |
ruby, email, rspec
its(:subject) { should eq mail_subject }
its(:to) { should eq [student.user.email] }
its(:from) { should eq ["info@test.com"] }
end
describe "issue" do
it_should_behave_like "outgoing mail", :issue, 'New Invoice!'
end
describe "rescind" do
it_should_behave_like "outgoing ... | {
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"tags": "ruby, email, rspec",
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} |
2. Relevant equations
3. The attempt at a solution
Last edited: Jun 6, 2012
2. Jun 6, 2012
### Ray Vickson
Assume the "outer" corner is at angle t, counterclockwise from the x-axis, and assume that t is uniformly distributed on (0,2π). Assume also that the point q is uniformly distributed within the circle. If F={r... | {
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"openwebmath_score": 0.7970540523529053,
"tags... |
object-oriented, design-patterns, vba, dependency-injection, repository
Private Function MockSqlResult() As SqlResult
Dim result As New SqlResult
Dim name As Variant
For Each name In FieldNames
result.AddFieldName name
Next
Dim row As SqlResultRow
For Each row In Items
... | {
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"tags": "object-oriented, design-patterns, vba, dependency-injection, repository",
"url... |
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