If I have a SparseMatrix and compute SparseILU restricting the
sparsity to the given matrix using the functions/options given in
https://www.dealii.org/developer/doxygen/deal.II/classSparseILU.html,
I was wondering if there is anyway to access the Sparse matrix obtained
after the SparseILU decomposition.
Not easily. The SparseILU class stores the information for the L and U
factors in the form of a matrix, of course, but it does not export this
matrix publicly. That's because we use the *storage format* of
SparseMatrix, but because we store two matrices in one object (namely,
the L and U factors), the thing we store this information in is not in
fact a matrix -- it's just a way to store the elements of L and U.
What would you need this information for, if I may ask?
Also does dealii make use of the MKL call "dcsrilu0" to do the
SparseILU when restricting the sparsity to the given matrix?
No, SparseILU uses an implementation of our own. I suspect that this
could be improved by a great deal using interfaces to other libraries --
contributions are always welcome!
Best
W.
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Wolfgang Bangerth email: [email protected]
www: http://www.math.colostate.edu/~bangerth/
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