It's a weird API but this is how it's been done since antiquity. On Wed, Jul 20, 2016 at 10:04 AM, Ahmed Mazari <ahmedmazari...@gmail.com> wrote:
> Thanks a lot it's more clear for me > > On Wed, Jul 20, 2016 at 4:01 PM, Stefan Karpinski <ste...@karpinski.org> > 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 <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. >>>> >>> >>> >> >
