boundary conditions

Manav Bhatia bhatiamanav at
Wed Jan 21 20:47:37 CST 2009


   I am trying to solve an eigenproblem. I would like to apply  
boundary conditions by removing the rows and columns associated with  
these dofs (as opposed to retaining/zeroing them and setting the  
diagonal elements to unit values).

   Is there a way for me to tell the matrix data structure which dofs  
to ignore during the matrix operations? Or should I create a separate  
matrix by extracting the unconstrained dofs from the global matrix?

   I would appreciate any inputs.


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