49 lines
1.6 KiB
C
49 lines
1.6 KiB
C
/*=============================================================================
|
|
|
|
This file is part of FLINT.
|
|
|
|
FLINT 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.
|
|
|
|
FLINT 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 FLINT; if not, write to the Free Software
|
|
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
|
|
=============================================================================*/
|
|
/******************************************************************************
|
|
|
|
Copyright (C) 2010 Fredrik Johansson
|
|
|
|
******************************************************************************/
|
|
|
|
#include "fmpz_mat.h"
|
|
|
|
void
|
|
fmpz_mat_randrank(fmpz_mat_t mat, flint_rand_t state, slong rank,
|
|
mp_bitcnt_t bits)
|
|
{
|
|
slong i;
|
|
fmpz * diag;
|
|
|
|
if (rank < 0 || rank > mat->r || rank > mat->c)
|
|
{
|
|
flint_printf("Exception (fmpz_mat_randrank). Impossible rank.\n");
|
|
abort();
|
|
}
|
|
|
|
diag = _fmpz_vec_init(rank);
|
|
for (i = 0; i < rank; i++)
|
|
fmpz_randtest_not_zero(&diag[i], state, bits);
|
|
|
|
fmpz_mat_randpermdiag(mat, state, diag, rank);
|
|
|
|
_fmpz_vec_clear(diag, rank);
|
|
}
|