loooooool On Wed, Jul 20, 2016 at 4:12 PM, Stefan Karpinski <ste...@karpinski.org> wrote:
> 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. >>>>> >>>> >>>> >>> >> >
