/* -*- mode: C -*- */ /* IGraph library. Copyright (C) 2007-2012 Gabor Csardi 334 Harvard street, Cambridge, MA 02139 USA This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #ifndef IGRAPH_BLAS_H #define IGRAPH_BLAS_H #include "igraph_decls.h" #include "igraph_types.h" #include "igraph_vector.h" #include "igraph_matrix.h" __BEGIN_DECLS /** * \section about_blas BLAS interface in igraph * * * BLAS is a highly optimized library for basic linear algebra operations * such as vector-vector, matrix-vector and matrix-matrix product. * Please see http://www.netlib.org/blas/ for details and a reference * implementation in Fortran. igraph contains some wrapper functions * that can be used to call BLAS routines in a somewhat more * user-friendly way. Not all BLAS routines are included in igraph, * and even those which are included might not have wrappers; * the extension of the set of wrapped functions will probably be driven * by igraph's internal requirements. The wrapper functions usually * substitute double-precision floating point arrays used by BLAS with * \type igraph_vector_t and \type igraph_matrix_t instances and also * remove those parameters (such as the number of rows/columns) that * can be inferred from the passed arguments directly. * */ IGRAPH_EXPORT void igraph_blas_dgemv(igraph_bool_t transpose, igraph_real_t alpha, const igraph_matrix_t* a, const igraph_vector_t* x, igraph_real_t beta, igraph_vector_t* y); IGRAPH_EXPORT void igraph_blas_dgemv_array(igraph_bool_t transpose, igraph_real_t alpha, const igraph_matrix_t* a, const igraph_real_t* x, igraph_real_t beta, igraph_real_t* y); IGRAPH_EXPORT igraph_real_t igraph_blas_dnrm2(const igraph_vector_t *v); IGRAPH_EXPORT int igraph_blas_ddot(const igraph_vector_t *v1, const igraph_vector_t *v2, igraph_real_t *res); __END_DECLS #endif