/usr/include/octave-4.0.3/octave/PermMatrix.h is in liboctave-dev 4.0.3-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Copyright (C) 2008-2015 Jaroslav Hajek
This file is part of Octave.
Octave 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 3 of the License, or (at your
option) any later version.
Octave 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 Octave; see the file COPYING. If not, see
<http://www.gnu.org/licenses/>.
*/
#if !defined (octave_PermMatrix_h)
#define octave_PermMatrix_h 1
#include "Array.h"
#include "mx-defs.h"
// Array<T> is inherited privately so that some methods, like index, don't
// produce unexpected results.
class OCTAVE_API PermMatrix : protected Array<octave_idx_type>
{
public:
PermMatrix (void) : Array<octave_idx_type> () { }
PermMatrix (octave_idx_type n);
PermMatrix (const Array<octave_idx_type>& p) GCC_ATTR_DEPRECATED;
PermMatrix (const Array<octave_idx_type>& p, bool colp, bool check = true);
PermMatrix (const PermMatrix& m) : Array<octave_idx_type> (m) { }
PermMatrix (const idx_vector& idx) GCC_ATTR_DEPRECATED;
PermMatrix (const idx_vector& idx, bool colp, octave_idx_type n = 0);
octave_idx_type dim1 (void) const
{ return Array<octave_idx_type>::length (); }
octave_idx_type dim2 (void) const
{ return Array<octave_idx_type>::length (); }
octave_idx_type rows (void) const { return dim1 (); }
octave_idx_type cols (void) const { return dim2 (); }
octave_idx_type columns (void) const { return dim2 (); }
octave_idx_type perm_length (void) const
{ return Array<octave_idx_type>::length (); }
// FIXME: a dangerous ambiguity?
octave_idx_type length (void) const
{ return perm_length (); }
octave_idx_type nelem (void) const { return dim1 () * dim2 (); }
octave_idx_type numel (void) const { return nelem (); }
size_t byte_size (void) const
{ return Array<octave_idx_type>::byte_size (); }
dim_vector dims (void) const { return dim_vector (dim1 (), dim2 ()); }
const Array<octave_idx_type>& col_perm_vec (void) const
{ return *this; }
octave_idx_type
elem (octave_idx_type i, octave_idx_type j) const
{
return (Array<octave_idx_type>::elem (j) == i) ? 1 : 0;
}
octave_idx_type
checkelem (octave_idx_type i, octave_idx_type j) const;
octave_idx_type
operator () (octave_idx_type i, octave_idx_type j) const
{
#if defined (BOUNDS_CHECKING)
return checkelem (i, j);
#else
return elem (i, j);
#endif
}
// These are, in fact, super-fast.
PermMatrix transpose (void) const;
PermMatrix inverse (void) const;
// Determinant, i.e. the sign of permutation.
octave_idx_type determinant (void) const;
// Efficient integer power of a permutation.
PermMatrix power (octave_idx_type n) const;
bool is_col_perm (void) const { return true; }
bool is_row_perm (void) const { return false; }
void print_info (std::ostream& os, const std::string& prefix) const
{ Array<octave_idx_type>::print_info (os, prefix); }
static PermMatrix eye (octave_idx_type n);
private:
PermMatrix pos_power (octave_idx_type m) const;
void setup (const Array<octave_idx_type>& p, bool colp, bool check);
void setup (const idx_vector& idx, bool colp, octave_idx_type n);
};
// Multiplying permutations together.
PermMatrix
OCTAVE_API
operator * (const PermMatrix& a, const PermMatrix& b);
#endif
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