On Thu, Dec 3, 2015 at 2:50 PM, Junchao Zhang <junchao.zh...@gmail.com>
wrote:

> Hello,
>    I am debugging a libmesh example code to learn libmesh.  Is there a
> method to print out the matrix and the vector, or even visualize them?
>

One thing I've used in the past is SparseMatrix::print_matlab().  You can
then use the built-in sparse matrix viewer in Matlab/Octave to view the
results.

If you're using PETSc, then you might want to play around with "-mat_view
draw" which can open an X window showing the sparsity structure.

MatView docs:
http://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/Mat/MatView.html

-- 
John
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