74 lines
2.4 KiB
C
74 lines
2.4 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 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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void
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nmod_mat_randops(nmod_mat_t mat, slong count, flint_rand_t state)
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{
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slong c, i, j, k;
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slong m = mat->r;
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slong n = mat->c;
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if (mat->r == 0 || mat->c == 0)
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return;
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for (c = 0; c < count; c++)
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{
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if (n_randint(state, 2))
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{
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if ((i = n_randint(state, m)) == (j = n_randint(state, m)))
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continue;
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if (n_randint(state, 2))
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for (k = 0; k < n; k++)
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mat->rows[j][k] = nmod_add(mat->rows[j][k],
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mat->rows[i][k], mat->mod);
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else
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for (k = 0; k < n; k++)
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mat->rows[j][k] = nmod_sub(mat->rows[j][k],
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mat->rows[i][k], mat->mod);
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}
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else
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{
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if ((i = n_randint(state, n)) == (j = n_randint(state, n)))
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continue;
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if (n_randint(state, 2))
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for (k = 0; k < m; k++)
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mat->rows[k][j] = nmod_add(mat->rows[k][j],
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mat->rows[k][i], mat->mod);
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else
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for (k = 0; k < m; k++)
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mat->rows[k][j] = nmod_sub(mat->rows[k][j],
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mat->rows[k][i], mat->mod);
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}
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}
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}
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