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export jacobian of conductive media dc into MATLAB

Posted 2010年5月3日 GMT-4 13:59 3 Replies

Harry Mahardika
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Hello,

I have a question.
I'm doing conductive media dc modeling for a 2D homogeneous electrical resistivity problem and I want to do inversion in MATLAB.
I need a set of Jacobian to do the inversion but I don't know how to export this from COMSOL to MATLAB.

Maybe there is someone who familiar with the problem, so maybe you could help me how to do this..

Thank you

3 Replies Last Post 2010年6月16日 GMT-4 20:46
Danial Tz
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Posted: 1 decade ago 2010年5月4日 GMT-4 01:22
maybe this helps: cds.comsol.com/access/dl/papers/1542/Persson.pdf
maybe this helps: http://cds.comsol.com/access/dl/papers/1542/Persson.pdf
Yannick Fargier
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Posted: 1 decade ago 2010年5月4日 GMT-4 03:32
Hi Harry,

you can follow the adjoint state method (see park & van, 1991).

At the end you must postprocess :

Jacobian = d V_i / d rho_j = postint (J_emdc*J_edmc). of the volume i.
for a pole pole configuration.

see my exemple : model sensitivity.mph (for a wenner if a remember well)

www.comsol.com/community/forums/general/thread/4922/

best regards,

Yannick Fargier
Hi Harry, you can follow the adjoint state method (see park & van, 1991). At the end you must postprocess : Jacobian = d V_i / d rho_j = postint (J_emdc*J_edmc). of the volume i. for a pole pole configuration. see my exemple : model sensitivity.mph (for a wenner if a remember well) http://www.comsol.com/community/forums/general/thread/4922/ best regards, Yannick Fargier
Harry Mahardika
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Posted: 1 decade ago 2010年6月16日 GMT-4 20:46
OK, thank you for all your reply..
I'll try your suggestion in couple of days or so..


Best regard,
Harry
OK, thank you for all your reply.. I'll try your suggestion in couple of days or so.. Best regard, Harry

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