/usr/include/igraph/igraph_blas.h is in libigraph0-dev 0.6.5-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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/*
IGraph library.
Copyright (C) 2007-2012 Gabor Csardi <csardi.gabor@gmail.com>
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 BLAS_H
#define BLAS_H
#include "igraph_types.h"
#include "igraph_vector.h"
#include "igraph_matrix.h"
#undef __BEGIN_DECLS
#undef __END_DECLS
#ifdef __cplusplus
# define __BEGIN_DECLS extern "C" {
# define __END_DECLS }
#else
# define __BEGIN_DECLS /* empty */
# define __END_DECLS /* empty */
#endif
__BEGIN_DECLS
/**
* \section about_blas BLAS interface in igraph
*
* <para>
* 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.
* </para>
*/
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);
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);
__END_DECLS
#endif
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