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.
