This page is a bit more helpful: http://www.ibm.com/support/knowledgecenter/SSFHY8_5.2.0/com.ibm.cluster.essl.v5r2.essl100.doc/am5gr_hsgemm.htm
N = no transform T = transpose C = conjugate transpose On Wed, Jul 20, 2016 at 9:48 AM, Ahmed Mazari <ahmedmazari...@gmail.com> wrote: > l still don't understand 'N' , 'T' . Any clarifications please ? > > TRANSA = 'N' or 'n', op( A ) = A. > > TRANSA = 'T' or 't', op( A ) = A'. > > TRANSB = 'N' or 'n', op( B ) = B. > > TRANSB = 'T' or 't', op( B ) = B'. > > TRANSB = 'C' or 'c', op( B ) = B'. > > > On Wed, Jul 20, 2016 at 3:36 PM, Steven G. Johnson <stevenj....@gmail.com> > wrote: > >> >> >> On Wednesday, July 20, 2016 at 9:33:37 AM UTC-4, Ahmed Mazari wrote: >>> >>> l'm new to julia. l want to use the Blas package. To do so, the meaning >>> of the two first parameters of gemm function are less evident for me What >>> the parameters 'N', 'T' represent? >>> >> >> Those exactly correspond to arguments to the Fortran dgemm subroutine ( >> http://www.math.utah.edu/software/lapack/lapack-blas/dgemm.html). They >> indicate whether the matrices are to be treated as transposed. >> >> >>> BLAS.gemm!('N', 'T', lr, alpha, A, B, beta, C) >>> >>> What is the difference between BLAS.gemm and BLAS.gemm! ? >>> >> >> The convention in Julia is that appending an exclamation mark (e.g. >> gemm!) indicates that the function modifies one of its arguments in-place, >> whereas gemm allocates a new array for the result. >> > >
