optimization - How to make my Fortran loop faster with BLAS - Matrix vector multiplication -


i optimize speed following fortran code

do ii = 1, n   (:,:) = (:,:) + c (ii) * b (:,:, ii ) enddo

with a(m,m) dimension , b(m,m) dimension.

i thinking of use blas

do jj=1,m   call zgemm('n', 'n', 1, m, n, cone, c(:), cone, b (jj,:, : ),&        n, czero, a(:,:), cone ) enddo

but not efficient still have loop. possible use increment , how?

in case n > m


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