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Mathematica : Recent Questions and Answers (Page 235)

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

How to increase the speed of NDsolve when using WhenEvent

I am trying to solve a set of ODE's with switching. I implemented using WhenEvents.xd = {1/√6, √5/√6};x0 = {1/√2, 1/√2};min = -0.0001;max = 0.0001;tmax = 10;sol = NDSolve[{...

Asked on 10/01/2020

1 answer

Solving a difference equation involving summation expressions-Implicit output

I am trying to solve a difference equation involving summation expression with the following code: RSolve[{s[n + 1] - (s[n]*(Z/A)) == Sum[((1/A)*((1 - (F*L1))^(n - m))*(Q + (YY* s[m...

Asked on 09/30/2020

0 answer

Using functions instead of lists in physics numerical problems

I'm using the following code for calculation of reflection and transmission coefficients through square well potential:minE = 5;maxE = 200;nE = 200;energies = Subdivide[minE, maxE, nE - 1];reflections =...

Asked on 09/26/2020 by Kater Tatianow

1 answer

Looking for AR (augmented reality) projects in Mathematica

I’m looking for any links or notebooks involving augmented reality. Any tools out there for Mathematica like ARKit?...

Asked on 09/25/2020 by user5601

1 answer

How can I get rid of Abs?

In the following code, the functions WP[t] and WS[t] are real. Time also is a positive parameter. As you can see, MATHEMATICA enters Abs in the calculations. Including Abs only...

Asked on 09/25/2020 by Mojtaba Rezaee

1 answer

How can I evaluate a matrix for a set of values?

I'm trying to evaluate a system, that depends on two variables, in a specific set of values. I will write an example, but my system is more complicated.H =...

Asked on 09/25/2020 by Nohora Alejandra Hernndez Cepe

3 answer

Incorrect truncation of a series expansion

What is wrong here?fExp = f0 + f1 Sqrt[s] + f2 s + O[s]^(3/2);{s fExp + O[s]^(3/2),s f + O[s]^(3/2)/.f->fExp}Returns{SeriesData[s, 0, {f0}, 2, 3, 2], SeriesData[s, 0, {},...

Asked on 09/25/2020 by Weather Report

0 answer

Find cycle length in a list

I have a list of lists of numbers:{{5,2,1},{8,1,3},{6,1,1,1},{8,1,3},{6,1,1,1},{8,1,3}}As you can see, they eventually cycle, but not immediately. I need a function that will take a list of lists of...

Asked on 09/24/2020 by Nico A

3 answer

How to simplify the plot codes or provide a new method to obtain the ideal PDF?

I want to create two planes in 3D space (looks like the following figure 1). Firstly, I try to use the ContourPlot3D and Polygon, but both of them will generate...

Asked on 09/24/2020 by likehust

2 answer

perpectly elastic collision pi model

Can you make a model like the video below? It's so amazing that I want to check it out.enter link description here...

Asked on 09/24/2020 by user21427

1 answer

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