Comments on: Run Comsol Simulations from Matlab

By: jcdoll

jcdoll — Thu, 17 Nov 2011 02:54:00 +0000

Hi Ali -
See the reply I just posted to Rupeshrpkoirala. But note, I haven’t used Comsol/Femlab for its Matlab integration since 2004. So while I’m keeping this page up for posterity, I’d wager that there are better ways to do it now.

- joey

By: jcdoll

jcdoll — Thu, 17 Nov 2011 02:53:00 +0000

See the tail end of the script on this page. most importantly…

fem.sol=femlin(…);
eii_struct = posteval(fem,’normE_wh’,…);

You use posteval in order to pull data out of the results structure. At least, this was how it worked back in 2004. Beyond that I can’t provide any advice.

Cheers,
Joey

By: ali

ali — Wed, 16 Nov 2011 20:34:00 +0000

Hi, I have saved a comsol simulation as a mfile. I can run this mfile in MATLAB. I do not know how to access the results. Is it possible to have comsol results in MATLAb workspace?
Thank you

By: Rupeshrpkoirala

Rupeshrpkoirala — Fri, 13 May 2011 18:31:00 +0000

hi, i have used COMSOL to solve a non linear partial differential equation. then i saved the file as .m . while running the model i wanted to extract data or tried to display the data in the variables but i could not. will you please tell me how the matlab model of the COMSOL used?

By: jcdoll

jcdoll — Thu, 24 Feb 2011 23:29:00 +0000

Hi Alain -
Yup, that’s exactly what the code in this post does. You’ll need to adapt it to your specific problem. From what I hear, the current MATLAB-Comsol integration is significantly better than it used to be and there are probably more detailed and up-to-date docs that shipped with your version of Comsol.

- Joey

By: Alain

Alain — Thu, 24 Feb 2011 16:06:00 +0000

Hello, i need help with Comsol – matlab.
I just started using comsol and it is painful.
I have a geometry which i can solve with comsol.
I have want to use matlab to change an input (which is a constant) in comsol and then solve the problem again via matlab. Is there a way to avoid going to comsol, changing manually the input, solve, go back to matlab and process the output ? In other words, is there a command in matlab to Solve the FEM model in comsol ?
Regards Alain

By: jcdoll

jcdoll — Thu, 16 Dec 2010 11:55:24 +0000

Hi Sara -
The post that you commented on is about using a poorly documented feature that might be helpful for advanced users.

If you need basic help on using their products, you should RTFM or contact Comsol. That's why they get paid the big bucks.

- joey

By: sara

sara — Wed, 15 Dec 2010 21:18:53 +0000

i want help witj Comsol Multiphysics 4.1 . i want to simulate and model electric field as a function of time varying voltage. i dont know how to do this, because i never used this software before. any help will be very appreciable. thanks
Regards Sara borge

By: Marco

Marco — Wed, 23 Jun 2010 16:43:31 +0000

Thanks man.. i've started today to use comsol with matlab script.. you show me that's possible..!!
Bye

By: jcdoll

jcdoll — Mon, 14 Jun 2010 00:35:20 +0000

That's because this is a *function* not a script. You need to pass in several arguments, i.e. the check out the first line…

function [simResults, lambda] = NanocrescentSim(OD, IDRatio, DRatio, lambda, eps_o)