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Extract Inner-Product-Matrices to Matlab?
Posted 18.09.2012, 05:07 GMT-4 Interfacing, Results & Visualization Version 4.2a 1 Reply
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Hello to all!
Does anyone know, how to access the inner product matrices in Comsol 4.2a in Matlab?
I would like to compute different norms of a solution u.
The Euclidian norm simply is: u' * u
If I want the L2 norm, I have to calculate u' * L2 * u
or for the H1 norm: u' * H1 * u
with the inner-product-matrices L2 or H1.
But how do I extract these inner-product-matrices L2 or H1 from Comsol? I think the L2-inner-product-matrix should be:
L2 = mphmatrix(model,'sol1','Out', 'D')
Right?
But how can I get the H1-inner-product- matrix?
Thank you very much
Oli
Does anyone know, how to access the inner product matrices in Comsol 4.2a in Matlab?
I would like to compute different norms of a solution u.
The Euclidian norm simply is: u' * u
If I want the L2 norm, I have to calculate u' * L2 * u
or for the H1 norm: u' * H1 * u
with the inner-product-matrices L2 or H1.
But how do I extract these inner-product-matrices L2 or H1 from Comsol? I think the L2-inner-product-matrix should be:
L2 = mphmatrix(model,'sol1','Out', 'D')
Right?
But how can I get the H1-inner-product- matrix?
Thank you very much
Oli
1 Reply Last Post 25.09.2012, 05:08 GMT-4
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Posted:
1 decade ago
Hi Oli,
The H1 inner product matrix is essentially the same as the "K" matrix for a Coefficient form PDE with c=a=1, remaining coefficients equal to zero, assembled using the mphmatrix command.
best regards
Nils Malm
COMSOL AB
The H1 inner product matrix is essentially the same as the "K" matrix for a Coefficient form PDE with c=a=1, remaining coefficients equal to zero, assembled using the mphmatrix command.
best regards
Nils Malm
COMSOL AB