56 lines
1.7 KiB
C
56 lines
1.7 KiB
C
/*=============================================================================
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This file is part of FLINT.
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FLINT is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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FLINT is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with FLINT; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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=============================================================================*/
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/******************************************************************************
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Copyright (C) 2010,2011 Fredrik Johansson
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******************************************************************************/
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#include "flint.h"
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#include "ulong_extras.h"
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#include "nmod_mat.h"
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#include "nmod_vec.h"
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#include "perm.h"
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int
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nmod_mat_randpermdiag(nmod_mat_t mat, flint_rand_t state,
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mp_srcptr diag, slong n)
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{
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int parity;
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slong i;
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slong * rows;
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slong * cols;
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rows = _perm_init(mat->r);
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cols = _perm_init(mat->c);
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parity = _perm_randtest(rows, mat->r, state);
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parity ^= _perm_randtest(cols, mat->c, state);
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nmod_mat_zero(mat);
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for (i = 0; i < n; i++)
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nmod_mat_entry(mat, rows[i], cols[i]) = diag[i];
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_perm_clear(rows);
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_perm_clear(cols);
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return parity;
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}
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