questions about the 'pdeeig'

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Haya M
Haya M 2020-1-24
编辑： Ravi Kumar 2020-1-28
I'm using the syntax [?,?]=??????(?,?,?,?.1.0,?,1.0,[−1,1]); to solve a PDE on a given domain with a given ? ,
I have two questions about this syntax
How can I extract the matrices of the finite elements system for the PDE i.e ?
and
how I can assure that the computed eigenvalue say ?(2) corresponds to the correct eigenfunction ?(:,2)? I mean are they eigenpairs? is there any way to check that?
Thanks

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Ravi Kumar
Ravi Kumar 2020-1-24
编辑：Ravi Kumar 2020-1-27
Please use one the newer workflow like general equation based one, Structural or Thermal one. Once you setup your model in one of the newwer workflow you can get matrices using assembleFEMatrices function.
For your second question you can back substitute eigenpair into the equation and make sure the residual is near zero.
Regards,
Ravi
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Haya M
Haya M 2020-1-28
Thank you Ravi for the answer,
Do you mean that res = norm((K-l1)*v) ?
best regards,
Haya
Ravi Kumar
Ravi Kumar 2020-1-28
Yep, that's right. Fixed my comment again.
Ragards,
Ravi

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