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Mathematica : Recent Questions and Answers (Page 133)

Find answers to your questions about Mathematica or help others by answering their Mathematica questions.

Packages for study presentation of groups

This question asks if there are tools/packages in Mathematica for the study of presentation of groups, but it is almost 7 years old and an answer suggests to use...

Asked on 03/29/2021

0 answer

Calculation of an integral which involves distribution of data

I have some data as:data={38.5286,38.3771,38.1375,36.2215,35.5168,35.5106,34.821,34.4819,34.1321,33.7647,33.5369,32.8756,32.8502,32.6769,32.5624,32.4046,31.4334,31.1738,30.7002,30.2592,30.2444,30.1869,29.5221,29.4132,29.304,29.2167,29.1548,29.1548,28.7772,28.6366,28.5317,28.4121,28.4038,28.3335,28.2843,27.9732,27.8936,27.7218,27.5,26.6693,26.6552,26.4365,26.25,25.7304,25.3032,25.2746,24.9944,23.9467,21.006,19.4551,18.3424,17.5895,17.442,15.0271}I want to numerically calculate the integral: $S = - int dx p(x) ln p(x)$, where $p(x)$ is the probability density function. This...

Asked on 03/29/2021 by user77256

1 answer

Recursion: Salamin and Brent equation for finding $pi$

I am attempting to compute $pi$ using the Salamin and Brent equation:Salamin and Brent (1976): Set $a_0=1$, $b_0=frac1{sqrt{2}}$, $s_0=frac12$. Then iterate:$$small a_k=frac{a_{k-1}+b_{k-1}}{2},; b_k=sqrt{a_{k-1} b_{k-1}},;...

Asked on 03/29/2021 by BoyAcc

1 answer

Solve four equations system considering that the picked solution should minimize a function

I wrote equations that represents the rotation on a gimbal system for pointing a telescope with 3 DOF,I have a system in four equations and 4 unknowns, but as...

Asked on 03/29/2021 by giampiero sindoni

1 answer

Turn definitions into rules

I know that this seems to be unnecessary, but here I have a bunch of assignments, like around 50, and I want to create rules for all these to have...

Asked on 03/29/2021 by Ying Zhang

1 answer

Adapting CoefficientList (and the related functions) to work with Laurent polynomials

Is there a slick way to make CoefficientList (and the other similar functions, CoefficientRules etc.) work for Laurent polynomials (i.e. where negative exponents can occur), if I don't know a...

Asked on 03/29/2021 by Ketil Tveiten

2 answer

Solving a trigonometric equation with discrete solutions

So I know that trigonometric equations show up here very often, but this one is particularly difficult and important to me, so that I was hoping to get some valuable...

Asked on 03/29/2021

1 answer

How to draw this three-dimensional implicit region?

I want to draw the surface of the upper half of the sphere $z = sqrt {4 x - x^2 - y^2}$ inside the cylinder $(x - 1)^2...

Asked on 03/29/2021

1 answer

I need to obtain distance and speed vs time in one direction gravitational force

I got frustrated from trying to solve supposing simple physic's problem. All book, textbooks, lectures are always calculation escape velocity from conservation of energy law. I am more ambitious more...

Asked on 03/28/2021

1 answer

DSolve for deflection of an elastic beam

I have to write a notebook about comparing the results of the deflection of an elastic beam, calculated with discrete methods and FE methods. The code has to be generalized...

Asked on 03/28/2021 by andris0110

0 answer

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