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Mathematica : Recent Questions and Answers (Page 205)

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

Solving a big matrix DE system using NDSolveValue

I know there are similar questions, but I was unable to understand the solution for my case in any of them. I have the following:Commutator[a_,b_] := a.b - b.a;initialstate...

Asked on 12/26/2020 by AdonaiH

0 answer

Fill in the hollow Spheres - generate solid spheres

I'd like to generate microstructures of composite materials and I use an algorithm to find the centers of the spheres knowing also the radius. My problem is that I only...

Asked on 12/26/2020 by Charis Sideris

1 answer

Constructing a graph from a distance matrix

I have a set $S$ of $n$ 2-dimensional points. We can compute a distance matrix (Euclidean distance) for $S$ using say this answer. I wish to form an $n$-vertex...

Asked on 12/26/2020 by Juho

2 answer

How to extract data and attribute data from an XMLElement

I am trying to write a function to extract both the data and the attribute data from an XMLElement in the same pass. I have followed the examples from Mathematica's...

Asked on 12/25/2020 by user74549

2 answer

Minimize doesn't work with more parameters

In the code I wrote there is a ParametricNDSolve with four parameters. I want to minimize an error function with Minimize. If I consider ParametricNDSolve with just one parameter everything...

Asked on 12/25/2020

0 answer

Changing the quality of the transient process in a nonlinear system (in Mathematica)

I urgently need advice and help. I have a system of differential equations like this: $begin{cases} frac{dx}{dt} == y[t] cdot alpha cdot sin(omega t) + frac{d}{dt}(alpha cdot sin(omega t))...

Asked on 12/25/2020 by dtn

1 answer

Set the same color scale across multiple ListContourPlots?

This is probably straightforward - but how would I set the same color scale across multiple ListContourPlots? if I have values from 10 to 25 on one ListContourPlot...

Asked on 12/25/2020 by Doug Kimzey

2 answer

Show Graphics on top of ParametricPlot3D

I want to show a curved trajectory in 3D with a small Sphere/Point denoting a specific point. Therefore, the Sphere/Point needs to be always visualised "in front" of the curve;...

Asked on 12/25/2020 by sdnnds

1 answer

NDSolve: InterpolatingFunction of Chemical Kinetics System Differs From Expected (AKA - Why Are My Plots Squiggly?)

I'm trying to use Mathematica (12.0.0) to model radiation chemical kinetics using a known reaction set, in this case it's water radiolysis. It solves the set of equations I throw...

Asked on 12/25/2020 by Connor

1 answer

How to transform a rational function to get desired factor

I have an expression like this-t^-b + (t - t^(1/2 + 1/(8 k)))^-bI would like to transform it to gett^-b (-1 + ((1 - t^(1/8 (-4 + 1/k))))^-b)In...

Asked on 12/25/2020

1 answer

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