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problem creating a model using a Matlab function (Comsol 4)

Posted 11.04.2011, 05:55 GMT-4 Low-Frequency Electromagnetics, Interfacing Version 4.0, Version 4.0a, Version 4.1, Version 4.2, Version 4.2a 6 Replies

Chris Shor
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Hi,
i want to create a Comsol model using a Matlab function like:

function myFunction()

model = ModelUtil.create('Model');
...

return

When i call the function Matlab returns this error:
??? Undefined variable "ModelUtil" or class "ModelUtil.create".

I guess somehow i have to tell Matlab to use Comsol 4 because it seems not able to find ModelUtil from within a function.
What am i doing wrong?

Thank you for any advice.
6 Replies Last Post 01.02.2012, 11:33 GMT-5
Chris Shor
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Posted: 1 decade ago 11.04.2011, 06:08 GMT-4
Just solved it - should have read the LiveLink-manual more carefully :) It is neccessary to import the Comsol classes first:

function myFunction()

import com.comsol.model.*
import com.comsol.model.util.*

model = ModelUtil.create('Model');
...

return



Just solved it - should have read the LiveLink-manual more carefully :) It is neccessary to import the Comsol classes first: function myFunction() import com.comsol.model.* import com.comsol.model.util.* model = ModelUtil.create('Model'); ... return
Arye Nudelman
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Posted: 1 decade ago 10.05.2011, 17:36 GMT-4
Hey i ask the same

thanks for your answer tomorrow i'll try it too

i want to make my model in comsol as a function in matlab and then i do sort of parametric
sweep on this model by using a for loop calling my model function and always with sweeping parameter

thanks a lot
and you think your advices here will work for me too?

Best regards,
Arye
Hey i ask the same thanks for your answer tomorrow i'll try it too i want to make my model in comsol as a function in matlab and then i do sort of parametric sweep on this model by using a for loop calling my model function and always with sweeping parameter thanks a lot and you think your advices here will work for me too? Best regards, Arye
Arye Nudelman
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Posted: 1 decade ago 11.05.2011, 13:35 GMT-4
Thanks it worked you are awesome
Thanks it worked you are awesome
xuesheng chen
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Posted: 1 decade ago 02.11.2011, 04:39 GMT-4
We need install LiveLink before using matlab combined with comsol v4?
We need install LiveLink before using matlab combined with comsol v4?
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago 02.11.2011, 05:30 GMT-4
Hi

Indeed you need a corresponding Matlab installed, then COMSOL With the Matlab livelink for V4 to get everything running together. Cehck with your local rep, or on the KB for install details

--
Good luck
Ivar
Hi Indeed you need a corresponding Matlab installed, then COMSOL With the Matlab livelink for V4 to get everything running together. Cehck with your local rep, or on the KB for install details -- Good luck Ivar
ilgin
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Posted: 1 decade ago 01.02.2012, 11:33 GMT-5
Hello,

As an addition to the explanation from "Chris Shor"; it is also possible to run a LiveLink operation to start model implamentation without creating a MATLAB function file. That was especially helpful (and seems faster) in my case, since I have pre-processing of my data before starting model implementation.

To do so;

..._______________________________________________

%% PRE_PROCESSING

% constants
x = 1;
y = 2;
z = 3;
...

%% MODEL IMPLEMENTATION

mphstart % connect MATLAB to the COMSOL server (in default port)
import com.comsol.model.* % import the COMSOL classes
import com.comsol.model.util.*

model = ModelUtil.create('Model'); % start model implementation
model.name('xxx');

model.param.set('x', [num2str(x) 'unit'], 'explanation'); % define global model parameters (constants)
model.param.set('y', [num2str(y) 'unit'], 'explanation');
model.param.set('z', [num2str(z) 'unit'], 'explanation');
....

return
..._______________________________________________


Hopefully that will be helpful.
(LiveLink for MATLAB Users Guide - p.12-14)


--
-----
COMSOL 4.2a
Ubuntu 11.04
MATLAB R2010a
Hello, As an addition to the explanation from "Chris Shor"; it is also possible to run a LiveLink operation to start model implamentation without creating a MATLAB function file. That was especially helpful (and seems faster) in my case, since I have pre-processing of my data before starting model implementation. To do so; ..._______________________________________________ %% PRE_PROCESSING % constants x = 1; y = 2; z = 3; ... %% MODEL IMPLEMENTATION mphstart % connect MATLAB to the COMSOL server (in default port) import com.comsol.model.* % import the COMSOL classes import com.comsol.model.util.* model = ModelUtil.create('Model'); % start model implementation model.name('xxx'); model.param.set('x', [num2str(x) 'unit'], 'explanation'); % define global model parameters (constants) model.param.set('y', [num2str(y) 'unit'], 'explanation'); model.param.set('z', [num2str(z) 'unit'], 'explanation'); .... return ..._______________________________________________ Hopefully that will be helpful. (LiveLink for MATLAB Users Guide - p.12-14) -- ----- COMSOL 4.2a Ubuntu 11.04 MATLAB R2010a

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