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Java class that calls a Matlab function

Posted 21.08.2025, 12:11 GMT-4 LiveLink for MATLAB, API Version 6.3 1 Reply

Angel Mora

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Hi,

I am coding my Comsol simulation using Java, i.e., with a Java class. This simulation calls a Matlab function. Additionally, my Java class reads parameters from a text file called 'input.dat'. So I wanted to run this simulation from the terminal with the following command:

comsolbatch -inputfile PiezoLattice.class input.dat

I had successfully run simulations that read data from an input file using the command above. However, for this simulation that calls a Matlab function, I always get the error of not finding the Matlab file. I have placed the Matlab file in the same folder of the Java class and I also tried to place in the Matlab folder (within Documents folder), but in both cases I get the same error. I thought in using the command 'comsolmphserver matlab', I need to use a Matlab file, not the Java class, to use that command.

So, is it possible to have my Comsol simulation that calls a Matlab function in a Java class ?

NOTE: If this discussion is duplicated I posted again because for some reason I could not find my initial post.

1 Reply Last Post 27.08.2025, 09:09 GMT-4

Lars Gregersen COMSOL Employee

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Posted: 6 months ago

Hi Angel

let see if I understand this correctly: In the model that is built by running the PiezoLattice.class file you have a MATLAB Function that uses a separate M-file. When looking for the M-file we look in the location of the saved MPH-file. Since there is no MPH-file you need to use one of the other methods of letting Matlab know where your file is. I would set the COMSOL_MATLAB_PATH variable. There is more info here: https://doc.comsol.com/6.3/docserver/#!/com.comsol.help.llmatlab/llmatlab_ug_callback.8.08.html?highlight=comsol_matlab_path

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Lars Gregersen
Comsol Denmark

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Java class that calls a Matlab function

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