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/*
Copyright (C) 2018 Fredrik Johansson
This file is part of FLINT.
FLINT is free software: you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License (LGPL) as published
by the Free Software Foundation; either version 3 of the License, or
(at your option) any later version. See <https://www.gnu.org/licenses/>.
*/
#include "arb.h"
void
arb_dot_simple(arb_t res, const arb_t initial, int subtract,
arb_srcptr x, slong xstep, arb_srcptr y, slong ystep, slong len, slong prec)
{
slong i;
if (len <= 0)
{
if (initial == NULL)
arb_zero(res);
else
arb_set_round(res, initial, prec);
return;
}
if (initial == NULL)
{
arb_mul(res, x, y, prec);
}
else
{
if (subtract)
arb_neg(res, initial);
else
arb_set(res, initial);
arb_addmul(res, x, y, prec);
}
for (i = 1; i < len; i++)
arb_addmul(res, x + i * xstep, y + i * ystep, prec);
if (subtract)
arb_neg(res, res);
}