48 lines
1.4 KiB
C
48 lines
1.4 KiB
C
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/*=============================================================================
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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) 2011 Fredrik Johansson
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******************************************************************************/
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#include <stdlib.h>
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#include <gmp.h>
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#include "flint.h"
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#include "nmod_mat.h"
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#include "nmod_vec.h"
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mp_limb_t
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nmod_mat_trace(const nmod_mat_t mat)
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{
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mp_limb_t t;
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slong i, n = nmod_mat_nrows(mat);
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if (n == 0)
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return 0;
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t = nmod_mat_entry(mat, 0, 0);
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for (i = 1; i < n; i++)
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t = nmod_add(t, nmod_mat_entry(mat, i, i), mat->mod);
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return t;
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}
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