Abdelrahman Said
68 lines
2.9 KiB
C
68 lines
2.9 KiB
C
/*
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igraph library.
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Copyright (C) 2007-2025 The igraph development team <igraph@igraph.org>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#ifndef IGRAPH_BLAS_H
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#define IGRAPH_BLAS_H
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#include "igraph_decls.h"
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#include "igraph_error.h"
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#include "igraph_types.h"
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#include "igraph_vector.h"
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#include "igraph_matrix.h"
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IGRAPH_BEGIN_C_DECLS
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/**
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* \section about_blas BLAS interface in igraph
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*
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* <para>
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* BLAS is a highly optimized library for basic linear algebra operations
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* such as vector-vector, matrix-vector and matrix-matrix product.
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* Please see http://www.netlib.org/blas/ for details and a reference
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* implementation in Fortran. igraph contains some wrapper functions
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* that can be used to call BLAS routines in a somewhat more
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* user-friendly way. Not all BLAS routines are included in igraph,
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* and even those which are included might not have wrappers;
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* the extension of the set of wrapped functions will probably be driven
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* by igraph's internal requirements. The wrapper functions usually
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* substitute double-precision floating point arrays used by BLAS with
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* \type igraph_vector_t and \type igraph_matrix_t instances and also
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* remove those parameters (such as the number of rows/columns) that
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* can be inferred from the passed arguments directly.
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* </para>
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*/
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IGRAPH_EXPORT igraph_error_t igraph_blas_dgemv(igraph_bool_t transpose, igraph_real_t alpha,
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const igraph_matrix_t* a, const igraph_vector_t* x,
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igraph_real_t beta, igraph_vector_t* y);
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IGRAPH_EXPORT igraph_error_t igraph_blas_dgemm(igraph_bool_t transpose_a,
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igraph_bool_t transpose_b, igraph_real_t alpha, const igraph_matrix_t* a,
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const igraph_matrix_t* b, igraph_real_t beta, igraph_matrix_t* c);
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IGRAPH_EXPORT igraph_error_t igraph_blas_dgemv_array(igraph_bool_t transpose, igraph_real_t alpha,
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const igraph_matrix_t* a, const igraph_real_t* x,
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igraph_real_t beta, igraph_real_t* y);
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IGRAPH_EXPORT igraph_real_t igraph_blas_dnrm2(const igraph_vector_t *v);
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IGRAPH_EXPORT igraph_error_t igraph_blas_ddot(const igraph_vector_t *v1, const igraph_vector_t *v2,
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igraph_real_t *res);
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IGRAPH_END_C_DECLS
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#endif
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