Hi Shiraz,
Today when I tried to compile the code which is meant to solve the
condition number of system matrix, I also got the compiling error:
"error: undefined reference to 'void
dealii::SparseDirectUMFPACK::initialize<dealii::TrilinosWrappers::BlockSparseMatrix>(dealii::TrilinosWrappers::BlockSparseMatrix
const&, dealii::SparseDirectUMFPACK::AdditionalData)'"
I uses "LA::MPI::BlockSparseMatrix system_pde_matrix;" to declare my
system_matrix instead what is used in step-36 "PETScWrappers::SparseMatrix
stiffness_matrix, mass_matrix;"
Is this where the problem lies?
Have you solved this compiling error finally?
Best regards,
Fan Meng
在 2015年5月17日星期日 UTC+2下午6:19:10，Shiraz Farouq写道：
>
> Hi !
>
> I am following from step-36 for solving the eigenvalue problem:
>
> I have a block matrix
>
> A=[M -aK
> K M]
>
> and preconditioner
>
> P=[M -a*aK
> K M+aK]
>
> I solve for the eigenvalue problem :
>
> *A* x=*P* \lambda x
>
> I am using the Arpack solver using the following code from step-36
>
> solve_for_eigenvalues(){
>
> SolverControl solver_control (system_dof_handler.n_dofs(), 1e-9);
> SparseDirectUMFPACK inverse;
> inverse.initialize (system_matrix);
> const unsigned int num_arnoldi_vectors = 2*eigenvalues.size() + 2;
> ArpackSolver::AdditionalData additional_data(num_arnoldi_vectors);
> ArpackSolver eigensolver (solver_control, additional_data);
> eigensolver.solve (system_matrix,
> system_matrix,
> inverse,
> eigenvalues,
> eigenfunctions,
> eigenfunctions.size());
> for (unsigned int i=0; i<eigenfunctions.size(); ++i)
> eigenfunctions[i] /= eigenfunctions[i].linfty_norm ();
> return solver_control.last_step ();
>
> }
>
> However, its doesn't compile
>
> undefined reference to `void
> dealii::SparseDirectUMFPACK::initialize<dealii::TrilinosWrappers::BlockSparseMatrix>(dealii::TrilinosWrappers::BlockSparseMatrix
>
> const&, dealii::SparseDirectUMFPACK::AdditionalData)'
>
> How is the reference undefined !
>
> Thanks
>
> /S
>
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