96 lines
2.7 KiB
C
96 lines
2.7 KiB
C
/*=============================================================================
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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) 2012 Fredrik Johansson
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******************************************************************************/
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#include <gmp.h>
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#include "flint.h"
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#include "fmpz.h"
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#include "fmpz_vec.h"
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slong
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_fmpz_vec_height_index(const fmpz * vec, slong len)
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{
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if (len == 1)
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{
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return 0;
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}
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else
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{
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fmpz c;
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mp_srcptr max_d;
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slong max_mpz_limbs, i, max_i, max_coeff, mpz_limbs;
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max_coeff = 0;
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max_i = 0;
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for (i = 0; i < len; i++)
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{
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c = vec[i];
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if (!COEFF_IS_MPZ(c))
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{
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c = FLINT_ABS(c);
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if (c > max_coeff)
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{
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max_coeff = c;
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max_i = i;
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}
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}
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else
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{
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__mpz_struct * mpz_ptr = COEFF_TO_PTR(c);
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max_d = mpz_ptr->_mp_d;
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max_mpz_limbs = mpz_ptr->_mp_size;
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max_mpz_limbs = FLINT_ABS(max_mpz_limbs);
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max_i = i;
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i++;
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break;
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}
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}
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for ( ; i < len; i++)
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{
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c = vec[i];
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/* we have found at least one mpz, so only look for those */
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if (COEFF_IS_MPZ(c))
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{
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__mpz_struct * mpz_ptr = COEFF_TO_PTR(c);
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mpz_limbs = mpz_ptr->_mp_size;
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mpz_limbs = FLINT_ABS(mpz_limbs);
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if (mpz_limbs > max_mpz_limbs ||
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((mpz_limbs == max_mpz_limbs) &&
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(mpn_cmp(mpz_ptr->_mp_d, max_d, max_mpz_limbs) > 0)))
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{
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max_d = mpz_ptr->_mp_d;
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max_mpz_limbs = mpz_limbs;
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max_i = i;
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}
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}
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}
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return max_i;
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}
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}
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