For questions concerning the popular computational software program published by Wolfram Research. (Note: you are more likely to get quicker and more accurate response if you ask the question on their user forum or on the Mathematica StackExchange site.)
4
votes
4answers
3k views
How do I convert the distance between two lat/long points into feet/meters?
I've been reading around the net and everything I find is really confusing. I just need a formula that will get me 95% there. I have a tool that outputs the distance between two lat/long points.
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2
votes
1answer
304 views
How to use Mathematica to solve equations in a polynomial ring?
I am sorry. But I wonder whether it is fine to ask this question here.
I need some help to solve some equations in a polynomial ring:
Give the ring $\mathbb{F}_p [x ]/(x^2+x+1)$, where $p$ is a ...
1
vote
0answers
196 views
(Improved; Kindly assist )CSI Forensic Maths
In a square room with 7 m-long sides, five people have shot at random people. They all had two bullets and killed two people in the crowd. Other people in the room were not hurt. CCTV recordings show ...
29
votes
3answers
257 views
Do we really know the reliability of PrimeQ[n] (for $n>10^{16}$)?
The algorithm Mathematica uses for its PrimeQ function is described on MathWorld. That web page says PrimeQ uses, "the multiple ...
1
vote
0answers
381 views
Mathematica: How to convert scales to frequencies?
According to the transform $$w(u,s)=\frac{1}{\sqrt{s}}\int _{-\infty }^{\infty }x(t) \psi ^*\left(\frac{t-u}{s}\right)dt,$$ the frequency should be $f=\omega/(2\pi)=1/(2\pi s)$ (is it right?), where ...
2
votes
1answer
132 views
Closed form with of a series Mathematica
I've these two series, and I would like a closed form:
$$ \sum_{k=-\infty}^{\infty} \frac{x+kx_0-h}{|x+kx_0|^3}$$
$$ 3\sum_{k=-\infty}^{\infty} \frac{(x+kx_0-h)(x+kx_0)^2}{|x+kx_0|^5} $$
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0
votes
1answer
254 views
How to solve integral in Mathematica?
I need matrix H. G is working, but H is just derivative?? How to obtain?
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35
votes
9answers
13k views
What should I learn first, Mathematica or MatLab?
I have a non-professional interest in math and I would like to be able to be curious and play around with some math that I'm learning about (both here and from calculus-and-higher level math classes).
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11
votes
5answers
4k views
Drawing heart in mathematica
It's not really a typical math question. Today, while studying graphs, I suddenly got inquisitive about whether there exists a function that could possibly draw a heart-shaped graph. Out of sheer ...
7
votes
4answers
906 views
Drawing a thickened Möbius strip in Mathematica
I would like to have Mathematica plot a "thickened Möbius strip", i.e. a torus with square cross section that is given a one-half twist. Ideally, I would like this thickened Möbius strip to be ...
3
votes
1answer
123 views
The limit of the expectation of the top half+1 order stats of $n$ draws of $X$ as $n\to\infty$?
Can anyone help me compute the limit of the average of the top half +1 of order marginal order distribution of $n$ draws from $X$, as $i\to\infty$?
Specifically, the limit as $i\to\infty$ of ...
0
votes
1answer
187 views
How to obtain big matrix in Mathematica?
Can you help me how to obtain big but simple matrix in Mathematica?
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-1
votes
1answer
203 views
How to make Runge-Kutta for solving nonlinear ODE system in Mathematica
How to make Runge Kutta method for system of non linear equations in this Matrix form. Matrices A3, B3 and B4 are functions of matrix X3. Initial conditions are X1=X2=X3=X4=0 and system is here
$$ ...
