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Note: This discussion is about an older version of the COMSOL Multiphysics® software. The information provided may be out of date.

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COMSOL expression evaluation

Posted 09.02.2012, 21:03 GMT-5 Parameters, Variables, & Functions Version 4.3 4 Replies

Mike Brown
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Hi all,

In COMSOL I am using two expressions to calculate a certain parameter, and the objective is to pick the one that under given conditions gives a result, which is a real number and 0<=x<=1). I can easily plug a MATLAB routine to do the assesment and pick the value calculated from either of the two expressions, but I always consider the use of MATLAB from COMSOL as last resort, so maybe there is a way to do it with some smart formula in COMSOL?

Any help will be very much appreciated,
Mike
4 Replies Last Post 04.07.2012, 03:45 GMT-4
Edgar Kaiser
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Posted: 1 decade ago 10.02.2012, 02:46 GMT-5
Mike,

you could try to use boolean expressions, like

x*(x>=0 & x<=1) This would result in the value of x between 0 and 1 and 0 elsewhere.

Cheers
Edgar
Mike, you could try to use boolean expressions, like x*(x>=0 & x
Mike Brown
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Posted: 1 decade ago 10.02.2012, 12:18 GMT-5
Thanks. This is better than nothing.

Cheers, M.
Thanks. This is better than nothing. Cheers, M.
Osameh Ghazian
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Posted: 1 decade ago 03.07.2012, 11:15 GMT-4
Hi Edgar,
Is it x*(x>=0 & x<=1) OR x*(x>=0 && x<=1) ?
Hi Edgar, Is it x*(x>=0 & x=0 && x
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago 04.07.2012, 03:45 GMT-4
Hi

have you read te help on "Special Operators" and "Unary and Binary Operators"

seem to go more towards && and || in COMSOL;)

--
Good luck
Ivar
Hi have you read te help on "Special Operators" and "Unary and Binary Operators" seem to go more towards && and || in COMSOL;) -- Good luck Ivar

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