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MATLAB Function and Automating M-Script File with Comsol: mphinterp Command

Posted 26 mai 2016, 16:40 UTC−4 Interfacing Version 5.1 5 Replies

Femi Oyedokun
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I have used the command syntax: mphinterp(model,'p','coord',coord1a) to extract pressure values at the stated coordinates:
coord1a=[x1;y1].
The study is in 2D; but I have been getting an empty matrix message. Please, is there something wrong in my approach?

5 Replies Last Post 31 mai 2016, 04:08 UTC−4
Lars Gregersen COMSOL Employee

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Posted: 8 years ago 30 mai 2016, 05:41 UTC−4
Hi

You code looks OK.

You should check your model and verify what dataset your results are placed in. Also verify that the model has in fact been solved ;-)

What are the values of x1 and y1? What is the dimension of your geometry?

Please quote any error messages you see. It makes trouble shooting so much easier.

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Lars Gregersen
Comsol Denmark
Hi You code looks OK. You should check your model and verify what dataset your results are placed in. Also verify that the model has in fact been solved ;-) What are the values of x1 and y1? What is the dimension of your geometry? Please quote any error messages you see. It makes trouble shooting so much easier. -- Lars Gregersen Comsol Denmark
Femi Oyedokun
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Posted: 8 years ago 30 mai 2016, 10:47 UTC−4
Thanks Lars,

The model has been solved; and the dimension of the study is 2D.
x1, y1 are the coordinates of the point where the pressure is to be extracted from the domain. The error message reads:

Empty Matrix: 0 x 1

I have used the same syntax for a 3D COMSOL demo model (busbar), and the extraction was successful. But in this particular model, I have tried many extraction points and i'm still getting the same error message.
Thanks Lars, The model has been solved; and the dimension of the study is 2D. x1, y1 are the coordinates of the point where the pressure is to be extracted from the domain. The error message reads: Empty Matrix: 0 x 1 I have used the same syntax for a 3D COMSOL demo model (busbar), and the extraction was successful. But in this particular model, I have tried many extraction points and i'm still getting the same error message.
Femi Oyedokun
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Posted: 8 years ago 30 mai 2016, 10:55 UTC−4
Empty matrix: 0-by-1
Empty matrix: 0-by-1
Femi Oyedokun
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Posted: 8 years ago 30 mai 2016, 14:15 UTC−4
I have found the cause of the error; as you mentioned earlier, to check the datasets. One of the datasets, which seems to be the default for extraction---dset1, had no solution.

Regards

Femi
I have found the cause of the error; as you mentioned earlier, to check the datasets. One of the datasets, which seems to be the default for extraction---dset1, had no solution. Regards Femi
Lars Gregersen COMSOL Employee

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Posted: 8 years ago 31 mai 2016, 04:08 UTC−4
Hi

I'll see if we can add an error message for this case.



I have found the cause of the error; as you mentioned earlier, to check the datasets. One of the datasets, which seems to be the default for extraction---dset1, had no solution.

Regards

Femi





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Lars Gregersen
Comsol Denmark
Hi I'll see if we can add an error message for this case. [QUOTE] I have found the cause of the error; as you mentioned earlier, to check the datasets. One of the datasets, which seems to be the default for extraction---dset1, had no solution. Regards Femi [/QUOTE] -- Lars Gregersen Comsol Denmark

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