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How to create a finite set of numbers

Posted 27 feb 2020, 09:39 GMT-5 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 29 feb 2020, 02:23 GMT-5
Léo Bourdet
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Posted: 4 years ago 28 feb 2020, 07:20 GMT-5

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: 4 years ago 28 feb 2020, 07:55 GMT-5

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: 4 years ago 28 feb 2020, 08:17 GMT-5

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: 4 years ago 29 feb 2020, 02:23 GMT-5

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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