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Which format you store the diagonal matrix? If take the diagonal matrix as sparse matrix.

'

Then you may do searchfrom mkl user manual,

http://software.intel.com/sites/products/documentation/hpc/mkl/mklman/index.htm

There are some routines to support sparsematrix* dense matrix

like

# mkl_?csrmm

Computes matrix - matrix product of a sparse matrix stored in the CSR format.

# mkl_?diamm

Computes matrix-matrix product of a sparse matrix stored in the diagonal formatwith one-based indexing.

You maysee if theyare ok.

Regards,

Ying H.

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