/usr/include/eclib/matrix.h is in libec-dev 20160720-2.
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 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 | // matrix.h: manage declarations of integer matrix classes
//////////////////////////////////////////////////////////////////////////
//
// Copyright 1990-2012 John Cremona
//
// This file is part of the eclib package.
//
// eclib 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.
//
// eclib 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 eclib; if not, write to the Free Software Foundation,
// Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
//
//////////////////////////////////////////////////////////////////////////
#if !defined(_MATRIX_H)
#define _MATRIX_H 1 //flags that this file has been included
#include "vector.h"
#include "limits.h" // MAX_INT gcc >= 4.3
#undef scalar
#undef vec
#undef mat
#undef subspace
#undef svec
#undef smat
#undef smat_elim
#define scalar int
#define vec vec_i
#define mat mat_i
#define subspace subspace_i
#define svec svec_i
#define smat smat_i
#define smat_elim smat_i_elim
#include "mat.h"
#undef scalar
#undef vec
#undef mat
#undef subspace
#undef svec
#undef smat
#undef smat_elim
#define scalar long
#define vec vec_l
#define mat mat_l
#define subspace subspace_l
#define svec svec_l
#define smat smat_l
#define smat_elim smat_l_elim
#include "mat.h"
#undef scalar
#undef vec
#undef mat
#undef subspace
#undef svec
#undef smat
#undef smat_elim
// SCALAR_OPTION may be set to 1 or 2 by user
#if (SCALAR_OPTION==1)
#define scalar int
#define vec vec_i
#define mat mat_i
#define subspace subspace_i
#define svec svec_i
#define smat smat_i
#define smat_elim smat_i_elim
#else
#define scalar long
#define vec vec_l
#define mat mat_l
#define subspace subspace_l
#define svec svec_l
#define smat smat_l
#define smat_elim smat_l_elim
#endif
// else user must use the unabbreviated names
#endif
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