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Extraction at Arbitrary Points and NaN

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I have gone through the matlab-comsol livelink manual, and I understand that the NaN output value occurs when the extraction point is outside of the computation domain; but in this case the point is within the domain and I am still getting the NaN value. Please, I will appreciate any assistance or suggestions.

Kindly find as attached the files in case you have sufficient time to run and check.

Regards

FEMI


2 Replies Last Post 2016年6月16日 GMT-4 15:21
Lars Gregersen COMSOL Employee

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Posted: 8 years ago 2016年6月16日 GMT-4 03:55
Hi

Your mesh looks too coarse to get any reliable result for your flow problem. Hence it could very well be the case that the variables you are trying to evaluate are in fact NaN.

--
Lars Gregersen
Comsol Denmark
Hi Your mesh looks too coarse to get any reliable result for your flow problem. Hence it could very well be the case that the variables you are trying to evaluate are in fact NaN. -- Lars Gregersen Comsol Denmark

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Posted: 8 years ago 2016年6月16日 GMT-4 15:21
Thanks Lars. I was able to extract when i put the coordinates directly in the mphinterp command line, even with the coarse mesh (i used the coarse mesh just to hasten the computation, but I am currently running with finer mesh now), that is:
coord28a=[5.4569;-12.0259];
mphinterp(model,'p','coord',coord28a,'dataset'​,'dset2','t',20);

but when i used the same coordinates in formular form i get NaN. Please, if you will be able to look at the attached MATLAB code line 233 to 268. This is the main code.
Thanks Lars. I was able to extract when i put the coordinates directly in the mphinterp command line, even with the coarse mesh (i used the coarse mesh just to hasten the computation, but I am currently running with finer mesh now), that is: coord28a=[5.4569;-12.0259]; mphinterp(model,'p','coord',coord28a,'dataset'​,'dset2','t',20); but when i used the same coordinates in formular form i get NaN. Please, if you will be able to look at the attached MATLAB code line 233 to 268. This is the main code.

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