mirror of
https://github.com/vale981/arb
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71 lines
2.2 KiB
C
71 lines
2.2 KiB
C
/*=============================================================================
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This file is part of ARB.
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ARB 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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ARB 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 ARB; 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 "fmpcb_mat.h"
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int
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fmpcb_cmpabs_approx(const fmpcb_t x, const fmpcb_t y)
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{
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const fmpr_struct *xm, *ym;
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if (fmpr_cmpabs(fmprb_midref(fmpcb_realref(x)), fmprb_midref(fmpcb_imagref(x))) >= 0)
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xm = fmprb_midref(fmpcb_realref(x));
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else
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xm = fmprb_midref(fmpcb_imagref(x));
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if (fmpr_cmpabs(fmprb_midref(fmpcb_realref(y)), fmprb_midref(fmpcb_imagref(y))) >= 0)
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ym = fmprb_midref(fmpcb_realref(y));
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else
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ym = fmprb_midref(fmpcb_imagref(y));
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return fmpr_cmpabs(xm, ym);
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}
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long
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fmpcb_mat_find_pivot_partial(const fmpcb_mat_t mat,
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long start_row, long end_row, long c)
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{
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long best_row, i;
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best_row = -1;
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for (i = start_row; i < end_row; i++)
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{
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if (!fmpcb_contains_zero(fmpcb_mat_entry(mat, i, c)))
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{
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if (best_row == -1)
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{
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best_row = i;
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}
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/* todo: should take the radius into account */
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else if (fmpcb_cmpabs_approx(fmpcb_mat_entry(mat, i, c), fmpcb_mat_entry(mat, best_row, c)) > 0)
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{
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best_row = i;
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}
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}
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}
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return best_row;
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}
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