pqc/external/flint-2.4.3/fmpz_poly_mat/trace.c

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2014-05-18 22:03:37 +00:00
/*=============================================================================
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) 2011 Fredrik Johansson
******************************************************************************/
#include "flint.h"
#include "fmpz_poly.h"
#include "fmpz_poly_mat.h"
void
fmpz_poly_mat_trace(fmpz_poly_t trace, const fmpz_poly_mat_t mat)
{
slong i, n = fmpz_poly_mat_nrows(mat);
if (n == 0)
fmpz_poly_zero(trace);
else
{
fmpz_poly_set(trace, fmpz_poly_mat_entry(mat, 0, 0));
for (i = 1; i < n; i++)
fmpz_poly_add(trace, trace, fmpz_poly_mat_entry(mat, i, i));
}
}