Discussion Forum

Posted: 1 decade ago 10.02.2011, 03:50 GMT-5

We have exactly the same question. Does anyone have an answer ? In our case, we lost 5 hours of processing-work because of Windows automatical updates during the night. We weren't able to save or export our work. So, is there any way to save or export a model with matlab ? Best regards

Posted: 1 decade ago 10.02.2011, 04:53 GMT-5

in 4.X, if you want save a model object in mph from matlab, you can use : model.save('filename'); eg. model.save('d:\users\OSCsavetest'); (the 'model' is the object you create with command: model = ModelUtil.create('Model'); it could be other names) with this command, it allows you to save you model object in m-file too you can find more detail in documentation: LiveLinkForMATLABUsersGuide.pdf I don't know if my answer is something you guys expected. hope it is useful to you Regards Honghui

Posted: 1 decade ago 10.02.2011, 07:01 GMT-5

If you say it works then this is exactly what I was looking for :)

Posted: 1 decade ago 11.02.2011, 05:46 GMT-5

It works and it was exactly what we were looking for. Thanx a lot Honghui Best regards Alex

Posted: 1 decade ago 09.03.2011, 11:19 GMT-5

And what if you have a M-file that you edited/modified and now want to save it back into the "model" or COMSOL? Unfortunately, model = ModelUtil.load(, ) is only for loading a .mph file. Doing .mph to .m is easy (in COMSOL, File > Save as Model M-file...). Doing .mph to model is easy (in MATLAB, see above) Doing model to .mph is easy (in MATLAB, model.save()) Doing model to .m is easy (in MATLAB, model.save(, 'm') But how to do: .m to .mph ??? or .m to model ??? (NOTE: In COMSOL 4.1 there is no option to do a "File open" of a M-file directly)

Posted: 1 decade ago 08.04.2011, 10:57 GMT-4

I think you can still use model.save('youmodle.mph'); but do not run "model.sol().runAll" I didn't try, hope it works

Posted: 1 decade ago 15.08.2012, 09:54 GMT-4

I'm using 4.3, and have found I get an error when I try to save. For example, if I run the following: Matlab Script: import com.comsol.model.* import com.comsol.model.util.* model = ModelUtil.create('Model'); model.modelPath('N:\Projects\MicFEAModelingPrograms\COMSOL42\BumpedBP\Matlab\'); model.save('test') I receive the error: "Error using com.comsol.model.impl.ModelImpl/save Java exception occurred: Exception: com.comsol.util.exceptions.FlException: Could not create temporary model file on server Messages: Could not create temporary model file on server" Any thoughts on what is causing this?

Posted: 1 decade ago 15.08.2012, 10:55 GMT-4

[quote]model.modelPath('N:\Projects\MicFEAModelingPrograms\COMSOL42\BumpedBP\Matlab\');[/quote] I don't know what the purpose of the modelPath property is, the documentation is mum on this. But as far as I can tell, it has no purpose. However, the documentation does have this to say: [quote]Use the function mphsave to save the model object linked to the MATLAB object model: mphsave(model,'filename') If the filename specified 'filename' [sic] does not provide a path the file is saved relatively to the local MATLAB path. The file extension determines which format to use (*.mph, *.m or *.java). Alternatively you can use the save method: model.save('filename'); If 'filename' does not provide a path the file is saved relatively to the local COMSOL server path. [/quote] So I guess in your case, you don't have write access to whatever the "local COMSOL server path" is. (On my machine, model.save() writes to [ComsolDir]\mli\startup for some reason.) I prefer to use mphsave() anyway, as the current Matlab working directory is usually the path I want to write to.

Posted: 1 decade ago 10.06.2014, 06:58 GMT-4

I have tried to introduce that but there are many things that scapes me. After saving your Matlab file as mphsave, is the file generated a .mph or a .m? what do you do to open it with comsol? Thanks a lot.

Posted: 9 years ago 30.06.2015, 15:52 GMT-4

Hi, I'm now using comsol4.3a and get the same error as yours. Have you figured out the reason for this error? Thank you!

Posted: 9 years ago 01.07.2015, 10:27 GMT-4

This seems to be an issue with that version. I tried the above code in 5.1 and it worked.

Posted: 9 years ago 01.07.2015, 10:43 GMT-4

In my case, it seems that we were running out of the space of server. The problem is solved after I released some space. Anyway, thank you for your response.