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How to create a finite set of numbers

Posted Feb 27, 2020, 9:39 a.m. EST General, Parameters, Variables, & Functions Version 5.4 4 Replies

Léo Bourdet
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Hello,

I would like to use as parameters a set of (random) numbers. The random part is easy once you have a set of numbers, but it seems that you can only define scalar parameters. Is there a way to do this, or a workaround?

Thanks for your help,

Leo

4 Replies Last Post Feb 29, 2020, 2:23 a.m. EST
Léo Bourdet
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Posted: 5 years ago Feb 28, 2020, 7:20 a.m. EST

I am also interested to know if you think this is not possible, and why

I am also interested to know if you think this is not possible, and why
Henrik Sönnerlind COMSOL Employee

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Posted: 5 years ago Feb 28, 2020, 7:55 a.m. EST

Hi,

If I understand your question correct, you can just use a parametric sweep like random(range(1,1,1000)).

Se attached screenshot.

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Henrik Sönnerlind
COMSOL
Hi, If I understand your question correct, you can just use a parametric sweep like random(range(1,1,1000)). Se attached screenshot.

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Léo Bourdet
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Posted: 5 years ago Feb 28, 2020, 8:17 a.m. EST

Hi, Thanks for your answer. I don't think that works in my case, because I need this set of numbers for a single simulation. If I understand correctly this will generate a random number for each simulation. Maybe more context helps: I want to make step-like variations of a quantity, with different step lengths, and the set of numbers would set the boundaries of this steps in space.

Hi, Thanks for your answer. I don't think that works in my case, because I need this set of numbers for a single simulation. If I understand correctly this will generate a random number for each simulation. Maybe more context helps: I want to make step-like variations of a quantity, with different step lengths, and the set of numbers would set the boundaries of this steps in space.
Henrik Sönnerlind COMSOL Employee

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Posted: 5 years ago Feb 29, 2020, 2:23 a.m. EST

In that case, I think it is easiest to define your input using a piecewise function where the intervals are random. The table in the function can for example be populated using a model method or by importing a table in created in Excel.

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Henrik Sönnerlind
COMSOL
In that case, I think it is easiest to define your input using a piecewise function where the intervals are random. The table in the function can for example be populated using a model method or by importing a table in created in Excel.

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