File: scalar_submul_fmpz.c

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flint 2.5.2-19
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/*=============================================================================

    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) 2008, 2009 William Hart
    Copyright (C) 2010 Sebastian Pancratz

******************************************************************************/

#include <gmp.h>
#include "flint.h"
#include "fmpz.h"
#include "fmpz_vec.h"
#include "fmpz_poly.h"

void
fmpz_poly_scalar_submul_fmpz(fmpz_poly_t poly1, const fmpz_poly_t poly2,
                             const fmpz_t x)
{
    if (!fmpz_is_zero(x) && !fmpz_poly_is_zero(poly2))
    {
        fmpz_poly_fit_length(poly1, poly2->length);
        _fmpz_vec_scalar_submul_fmpz(poly1->coeffs, 
                                     poly2->coeffs, poly2->length, x);
        _fmpz_poly_set_length(poly1, FLINT_MAX(poly1->length, poly2->length));
        _fmpz_poly_normalise(poly1);
    }
}