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Conditional Expressions

Posted 27.09.2012, 20:41 GMT-4 Version 4.2a 3 Replies

Darin Bellisario

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Hi All,

I was wondering if there is a way to make a dependent variable's expression be different depending on the value of another dependent variable.

For example, suppose we have the expression
ut-u=0

and wanted
y-u^2 = 0
for some u, but
y-u^3 = 0
for other u values.

Is there a way to do that?

Thanks for any advice in advance,

3 Replies Last Post 28.09.2012, 14:33 GMT-4

Nagi Elabbasi Facebook Reality Labs

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Posted: 1 decade ago

You can setup expressions such as this (y-u^2)*(u<2)+(y-u^3)*(u>=2)

Darin Bellisario

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Posted: 1 decade ago

I see, so to make sure I understand, COMSOL evaluates inequalities as 0 if they are false, and 1 if they are true? Or is it -1 if they are false?

Nagi Elabbasi Facebook Reality Labs

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Posted: 1 decade ago

0 if false 1 if true

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