/usr/include/gsl/gsl_matrix.h is in libgsl-dev 2.3+dfsg-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 | #ifndef __GSL_MATRIX_H__
#define __GSL_MATRIX_H__
#include <gsl/gsl_matrix_complex_long_double.h>
#include <gsl/gsl_matrix_complex_double.h>
#include <gsl/gsl_matrix_complex_float.h>
#include <gsl/gsl_matrix_long_double.h>
#include <gsl/gsl_matrix_double.h>
#include <gsl/gsl_matrix_float.h>
#include <gsl/gsl_matrix_ulong.h>
#include <gsl/gsl_matrix_long.h>
#include <gsl/gsl_matrix_uint.h>
#include <gsl/gsl_matrix_int.h>
#include <gsl/gsl_matrix_ushort.h>
#include <gsl/gsl_matrix_short.h>
#include <gsl/gsl_matrix_uchar.h>
#include <gsl/gsl_matrix_char.h>
#endif /* __GSL_MATRIX_H__ */
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