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Mathematica : Recent Questions and Answers (Page 8)

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

Prony series with a large number of terms

A Prony series is similar to a Fourier series but can have fewer terms. It takes the form $sum_{i=1}^{M} A_i e^{sigma _i t} cos left(omega _i t+phi _iright)$ Note...

Asked on 11/15/2021

2 answer

Iterated differential operator

I would like to implement the following differential operator in Mathematica, $$prod_{j=1}^n left({mathrm d over mathrm d x}-jright)$$ On a case by case basis, I can just...

Asked on 11/15/2021

3 answer

Convert huge (10-100MB of plain text) Mathematica function for external use

I have a huge Mathematica function (plain text ranging 10-100MB) that I am trying to convert to Fortran for external use. I tried using FortranForm, which does most of the...

Asked on 11/13/2021

0 answer

Mathematica emits a beep after any evaluation - how to remove it?

Without any obvious reason Mathematica started to emit a beep after each evaluation, even when it is error free. Why is that, and how can I turn it off? I...

Asked on 11/11/2021 by Pxx

2 answer

Export NetCDF Dimension Name

In the NetCDF format, I can define a common dimension with a specified name. Then when I create variables, I can have the dimensions of those variables reference the same...

Asked on 11/11/2021

1 answer

Simultaneously fitting multiple datasets

What is the proposed approach if one wants to simultaneously fit multiple functions to multiple datasets with shared parameters? As an example consider the following case: We have to...

Asked on 11/08/2021

5 answer

Generating a list of two-dim. points from list of higher-dim. ones

I have a table of lists, ie. s = { {1, 2, 4}, {7, 11}, {3, 4, 12} }. From this table, I would like to create the table of...

Asked on 11/08/2021

2 answer

Need help to fill this matrix

I have a listo of 1000 numbers ${x_0,x_1,cdots,x_{999}}$, I need to fill a matrix with these numbers. The matrix must have this form: $$left( begin{array}{cccc}x_{9} &x_8 &cdots&...

Asked on 11/05/2021

1 answer

Possible error with Series expansion

I'm expanding the following expression around x=1Series[-((-(16/(x^2 (-2 + x^2))) + 32/(-1 + x^2)^2 - ( 16 x Sqrt[-(-2 + x^2) (-1 + x^2)^2])/(-1 + x^2)^3 + (...

Asked on 11/05/2021

2 answer

Some Strange results from MMA and Matlab

Recently I am repeating a numerical discrete Fourier transform.Since this problem is related to a real experiment. So the authors use some complex functions to fit the results. Below...

Asked on 10/22/2021

1 answer

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