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Mathematica : Recent Questions and Answers (Page 210)

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

Speeding up this NIntegrate

I'm trying out the code below and it takes quite a long time to compute and throws eincr and slwcon warnings. Is there a way to speed this up?phase[u_,...

Asked on 12/20/2020 by 123infinity

1 answer

2-D Fourier series components from image

Suppose I draw a black/white image where the color black represents 1.0 and the color white represents 0. Is there a way to extract numerical estimates for the coefficients of...

Asked on 12/20/2020 by Tom Waits

1 answer

Need help creating a function for an angle

Help with creating functions. I have an assignment I need to do, and the first part is asking me to create a one argument function that has one angle between...

Asked on 12/20/2020 by Raven

0 answer

Different sensitivies from LinearSolve and Eigenvalues. How to conciliate them?

I use the following functions to receive a matrix, and make it symmetric positive definite:isPD[mat_] := Module[{norm}, norm = Norm[mat]; Apply[And, Map[(# > 0) &,...

Asked on 12/20/2020

0 answer

Can I Center Chart Elements in BarChart

I am generating a bar chart in which each count is to be represented by a disk (or something similar). This alone seems straightforward: simply set the option ChartElements ->...

Asked on 12/19/2020 by Aaron Eiben

1 answer

General Theta Functions in Mathematica?

Given a positive-definite or negative-definite matrix $A$ of size $r times r$, one can define the corresponding theta function $$f_{A}(q) = sum_{v in mathbb{Z}^{r}} q^{v^{t}Av} = 1...

Asked on 12/19/2020 by Benighted

0 answer

Trouble using ParametricNDSolve in Manipulate

I have troubles to understand how to use Manipulate and ParametricNDSolve to have modulable parameters inside my models. I checked numerous questions on this forum and couldn't find one that...

Asked on 12/19/2020 by Jerobou

1 answer

Mass Transport FEM Using Quad Mesh

This question is a follow-up to my previous question and an attempt to implement @Tim Laska's excellent approach of setting up an anisotropic quad mesh. I'm solving a...

Asked on 12/19/2020 by Rpj

1 answer

Improving the performance of ParallelTable[]

QuestionsThere are two things that I want to ask:What is the relation between computation time of the ParallelTable[] and the length of the table?This is meant to be a rough...

Asked on 12/19/2020 by Jak

0 answer

how to depict a network with a legend

Because my network nodes have real world names more than a few characters long, I'd like to label them with a shortcut, e.g., n1, n2, n3, ..., and put a...

Asked on 12/18/2020 by oldlab

1 answer

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