Thanks a lot it's more clear for me On Wed, Jul 20, 2016 at 4:01 PM, Stefan Karpinski <[email protected]> wrote:
> 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 <[email protected]> > 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 <[email protected] >> > 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. >>> >> >> >
