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Complex data

Posted 5 ott 2009, 09:46 GMT-4 4 Replies

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Hi,

For my analysis i am using matlab to postproces data from Comsol. However when collecting this data from Comsol by posteval, it only export real data. The imaginary part is discarded. What can i do to collect the imaginary part too?

thanks in advance,

AM
4 Replies Last Post 9 ott 2009, 03:17 GMT-4
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 2 decades ago 5 ott 2009, 11:21 GMT-4
Hi

have you read through and understood the chapter on posteval in the command.pdf documentation file ?

there are a few comments about complex data, I suspect (havnt tried recently) that you must make two reads one for the phase=0 (real part) and one for phase=90° (complex part).

there is also the Complexfun variable, that I understand more for the resolution with complex functions, to ell the solver to consider complete complex values, not just the real part.

Goog luck
Ivar
Hi have you read through and understood the chapter on posteval in the command.pdf documentation file ? there are a few comments about complex data, I suspect (havnt tried recently) that you must make two reads one for the phase=0 (real part) and one for phase=90° (complex part). there is also the Complexfun variable, that I understand more for the resolution with complex functions, to ell the solver to consider complete complex values, not just the real part. Goog luck Ivar
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Posted: 2 decades ago 6 ott 2009, 05:34 GMT-4
I dont think adding a phase of 90deg is the answer. I simply cant figure out what can export complex values.

Another problem in Matlab/Comsol is the following error i get:
>> fem.sol.u
??? Undefined function or method 'flgetarray' for input arguments of type 'int32'.

Error in ==> flexchprop>l_flgetmatrix at 53
vao = flgetarray(exch.getDim,exch.getAdr,exch.isReal);

Error in ==> flexchprop at 21
[varargout{1:nout}] = l_flgetmatrix(outprop, outstr);

Error in ==> femsol.subsref at 30
out(:,i)=flexchprop('flgetmatrix',prop,STR);

What can i do about that?

Thanks
I dont think adding a phase of 90deg is the answer. I simply cant figure out what can export complex values. Another problem in Matlab/Comsol is the following error i get: >> fem.sol.u ??? Undefined function or method 'flgetarray' for input arguments of type 'int32'. Error in ==> flexchprop>l_flgetmatrix at 53 vao = flgetarray(exch.getDim,exch.getAdr,exch.isReal); Error in ==> flexchprop at 21 [varargout{1:nout}] = l_flgetmatrix(outprop, outstr); Error in ==> femsol.subsref at 30 out(:,i)=flexchprop('flgetmatrix',prop,STR); What can i do about that? Thanks
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 2 decades ago 6 ott 2009, 07:38 GMT-4
Hi

I can do little with the cryptic error messages of COMSOL, the best is to get their help there.
The only I have noticed is that the "fl" introduction to function names stands for original "Femlab" code, and what is written below you had an "get-array" 'int32' cast error when attempting to access parts of "fem.sol.u".

Now concerning the phase, I might not fully understand what you are searching, but you can find how the "phase" is linked in here in COMSOL , i.e. in the smeug.pdf file (an excerb is attached below), or in the knowledgbase:

www.comsol.com/support/knowledgebase/878/
www.comsol.com/support/knowledgebase/1009/

these are more related to AC/DC but they also apply by similiriaty to structural

Good luck
Ivar
Hi I can do little with the cryptic error messages of COMSOL, the best is to get their help there. The only I have noticed is that the "fl" introduction to function names stands for original "Femlab" code, and what is written below you had an "get-array" 'int32' cast error when attempting to access parts of "fem.sol.u". Now concerning the phase, I might not fully understand what you are searching, but you can find how the "phase" is linked in here in COMSOL , i.e. in the smeug.pdf file (an excerb is attached below), or in the knowledgbase: http://www.comsol.com/support/knowledgebase/878/ http://www.comsol.com/support/knowledgebase/1009/ these are more related to AC/DC but they also apply by similiriaty to structural Good luck Ivar

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Posted: 2 decades ago 9 ott 2009, 03:17 GMT-4
Apperently you were right about splitting the results in imaginary and real parts. This is my solution:
data= posteval(fem,'p','Solnum','all')
data2=posteval(fem,'imag(p)','Solnum', 'all')
Apperently you were right about splitting the results in imaginary and real parts. This is my solution: data= posteval(fem,'p','Solnum','all') data2=posteval(fem,'imag(p)','Solnum', 'all')

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