Comments on: Run Comsol Simulations from Matlab

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)

By: Sharifi Fatemeh

Sharifi Fatemeh — Sun, 13 Jun 2010 11:37:36 +0000

Hi
i copied your m file and run it in my matlab2008b but it shows errors for example:
??? Input argument "OD" is undefined.

Error in ==> NanocrescentSim at 29
for outsideRadius = OD/2

when i get a specific number to OD, it then start asking another parameter
i dont know how to do
i think comsol should some how defined this parameters in matalb

please tell me how to remove this errorrs
my email is: sharifi.fatemeh@gmail.com

By: fmhood

fmhood — Fri, 22 Jan 2010 15:02:07 +0000

Wow this is really powerfull then! thanks alot!

By: jcdoll

jcdoll — Fri, 22 Jan 2010 06:58:21 +0000

Yup, when femlin() is called, Matlab waits for Comsol to return the data. Once the simulation is done, the solution is stored in fem.sol and can be treated like any old struct.

By: fmhood

fmhood — Wed, 20 Jan 2010 13:55:07 +0000

Thanks alot.
I think I understand how the m-file is generated and accessed using matlab.
I need one small clarification though: When matlab reads the 'simulation loop' in the script above, it make calls to comsol in order to start the simulations and afterwards access the data to postprocess it in the matlab environment?

By: jcdoll

jcdoll — Wed, 20 Jan 2010 00:48:54 +0000

You first open “Comsol with Matlab”, which will start instances of both applications. Then in the Matlab window you run the code above. This method allows you to access the data that the simulation spits out. Alternatively, you can open .m files directly in Comsol, which will run them but won't give you direct data access.

A useful approach to generating a .m file for a new problem is to generate your model in Comsol and then use the “save as” option to save the model as a .m file, which can then be tweaked and run in Matlab.

By: fmhood

fmhood — Tue, 19 Jan 2010 19:37:29 +0000

Thanks for a great post!
I have no experience with comsol-matlab interface, so bear with me. I can see that the simulation section is looped. So I suppose that the m-file above is loaded into comsol, to run/solve it? Or is everything done in matlab?

By: jcdoll

jcdoll — Sat, 14 Nov 2009 10:15:28 +0000

Install Comsol after installing Matlab, and be sure to check the box for Matlab integration during the Comsol install.

By: jcdoll

jcdoll — Sat, 14 Nov 2009 02:15:28 +0000

Install Comsol after installing Matlab, and be sure to check the box for Matlab integration during the Comsol install.