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model.param.get does not return complex values

Posted 27 nov 2011, 05:43 GMT-5 Parameters, Variables, & Functions Version 4.2a 3 Replies

Emi Kawamura
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I set a parameter to a complex value by:

model.param.set('v1', 4.5+j*2)

However, when I try to access the parameter later by

model.param.get('v1')

All I get is

4.5

I am using comsol4.2a and matlab 2011a on a 64 bit linux machine.

Does the error occur when I am setting the parameter value or when I am accessing it.

In other words, is 'v1' correctly set to the complex value, and it is just the model.param.get that is not
working properly?

Or, is it model.param.set which is not setting 'v1' correctly?

I would appreciate any help.

Thank you,
Emi
3 Replies Last Post 28 nov 2011, 01:15 GMT-5
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago 27 nov 2011, 14:55 GMT-5
Hi

I'm not sure you can retrieve the comlex value in one call, have you tried to recall twice with a real() and imag()

--
Good luck
Ivar
Hi I'm not sure you can retrieve the comlex value in one call, have you tried to recall twice with a real() and imag() -- Good luck Ivar
Emi Kawamura
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Posted: 1 decade ago 27 nov 2011, 16:20 GMT-5

No, the model.param.set does not work if you set a parameter to a complex number.

Currently, I am getting around this by turning the complex value into a string and
setting the parameter to that string.

Example:
v1 = 4.5+j*2.5
v1String = num2str(v1);
model.param.set('v1', v1String);

Then when I call
model.param.get('v1')

I get the correct value:
4.5+j*2.5

So, I guess to pass complex values to model.param.set, you need to convert it to a string first.

Regards,
Emi
No, the model.param.set does not work if you set a parameter to a complex number. Currently, I am getting around this by turning the complex value into a string and setting the parameter to that string. Example: v1 = 4.5+j*2.5 v1String = num2str(v1); model.param.set('v1', v1String); Then when I call model.param.get('v1') I get the correct value: 4.5+j*2.5 So, I guess to pass complex values to model.param.set, you need to convert it to a string first. Regards, Emi
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago 28 nov 2011, 01:15 GMT-5
Hi

Then I think it's worth to get that confirmed by "support". I find it somewhat astonishing, but OK, I hardly use matlab now with V4

--
Good luck
Ivar
Hi Then I think it's worth to get that confirmed by "support". I find it somewhat astonishing, but OK, I hardly use matlab now with V4 -- Good luck Ivar

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