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Mathematica : Recent Questions and Answers (Page 87)

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

Balanced flux in FEA using NeumanValue

I'm using NeumannValue boundary conditions for a 3d FEA using NDSolveValue. In one area I have positive flux and in another area i have negative flux. In theory...

Asked on 06/02/2021 by user1816847

3 answer

Two different variables in a Do Loop

I am trying to use the code developed by @Alex Trounev here: Numerical solution of an iterative equation for different kind of q. I am not sure how to...

Asked on 06/02/2021

1 answer

How can I make a dataset with one element display with a header row?

I'm building a virtual lab exercise in Mathematica. As part of it, I'm using Dynamic to show the students' lab dataset that they store in memory using a ClickPane....

Asked on 06/02/2021

1 answer

How to change colours in the RegionPlot Function when three colours are used for three different expressions

I am using the RegionPlot function to show contour maps of three expression but I want the white, gray and black colours instead of the default ones. How to change...

Asked on 06/02/2021 by Zied

1 answer

Syntax error in NMaximize despite following official documentation

This is the code I'm trying to run:NMaximize[ {k, (a + b + c + d + e + f + g + h + i + j +...

Asked on 06/01/2021

2 answer

Symbolic solution of system of equations 12x12 takes very long time and the answer is complex too

I am trying to solve a system of equation symbolically. It works fine for 6x6, however for 12x12 system it takes very long and the answers are complex. I am...

Asked on 06/01/2021 by FSK

1 answer

Plotting Eigenvalues and severe Noise Problems

I am trying to plot Eigen values of my System Hamiltonian in Mathematica. This is generating very noisy plot.This is my code.ϵ = 0;A[α_, c_, b_, q_] :=...

Asked on 06/01/2021

1 answer

Three coupled PDEs to be solved semi-analytically/analytically

I have been trying to solve the following three coupled PDEs where the final objective is to find the distributions $theta_h, theta_c$ and $theta_w$: $xin[0,1]$ and ...

Asked on 06/01/2021

2 answer

Complex Exponentials to Trig Functions?

I have an expressionexpr = 1/2 a E^(-3 I ω t) (E^(3 I ω t)+2 Cos[π x/a]) (1+2 E^(3 I ω t) Cos[π x/a]) Sin[π x/a]^2;expr // TeXForm$frac{1}{2}...

Asked on 06/01/2021

1 answer

Replacement of functions bound by sums and integrals in NCAlgebra

I want to use the NCAlgebra package to do some simplification on non commutative expressions involving integrals. For example, one such expression would be $$ I=left(int...

Asked on 06/01/2021

0 answer

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