pqc/external/flint-2.4.3/fmpq_mat/mul_direct.c
2014-05-24 23:16:06 +02:00

61 lines
1.9 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) 2011 Fredrik Johansson
******************************************************************************/
#include "fmpq_mat.h"
void fmpq_mat_mul_direct(fmpq_mat_t C, const fmpq_mat_t A, const fmpq_mat_t B)
{
slong i, j, k;
if (A == C || B == C)
{
flint_printf("Exception (fmpq_mat_mul_direct). Aliasing not implemented.\n");
abort();
}
if (A->c == 0)
{
fmpq_mat_zero(C);
return;
}
for (i = 0; i < A->r; i++)
{
for (j = 0; j < B->c; j++)
{
fmpq_mul(fmpq_mat_entry(C, i, j),
fmpq_mat_entry(A, i, 0),
fmpq_mat_entry(B, 0, j));
for (k = 1; k < A->c; k++)
{
fmpq_addmul(fmpq_mat_entry(C, i, j),
fmpq_mat_entry(A, i, k),
fmpq_mat_entry(B, k, j));
}
}
}
}