93 lines
2.8 KiB
C
93 lines
2.8 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) 2007 David Howden
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Copyright (C) 2007, 2008, 2009, 2010 William Hart
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Copyright (C) 2008 Richard Howell-Peak
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Copyright (C) 2011 Fredrik Johansson
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Copyright (C) 2012 Lina Kulakova
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Copyright (C) 2013 Mike Hansen
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******************************************************************************/
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#ifdef T
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#include "templates.h"
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void
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TEMPLATE(T, poly_factor_cantor_zassenhaus) (TEMPLATE(T, poly_factor_t) res,
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const TEMPLATE(T, poly_t) f,
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const TEMPLATE(T, ctx_t) ctx)
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{
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TEMPLATE(T, poly_t) h, v, g, x;
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fmpz_t q;
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slong i, j, num;
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fmpz_init(q);
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TEMPLATE(T, ctx_order) (q, ctx);
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TEMPLATE(T, poly_init) (h, ctx);
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TEMPLATE(T, poly_init) (g, ctx);
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TEMPLATE(T, poly_init) (v, ctx);
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TEMPLATE(T, poly_init) (x, ctx);
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TEMPLATE(T, poly_gen) (h, ctx);
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TEMPLATE(T, poly_gen) (x, ctx);
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TEMPLATE(T, poly_make_monic) (v, f, ctx);
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i = 0;
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do
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{
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i++;
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TEMPLATE(T, poly_powmod_fmpz_binexp) (h, h, q, v, ctx);
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TEMPLATE(T, poly_sub) (h, h, x, ctx);
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TEMPLATE(T, poly_gcd) (g, h, v, ctx);
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TEMPLATE(T, poly_add) (h, h, x, ctx);
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if (g->length != 1)
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{
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TEMPLATE(T, poly_make_monic) (g, g, ctx);
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num = res->num;
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TEMPLATE(T, poly_factor_equal_deg) (res, g, i, ctx);
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for (j = num; j < res->num; j++)
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res->exp[j] = TEMPLATE(T, poly_remove) (v, res->poly + j, ctx);
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}
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}
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while (v->length >= 2 * i + 3);
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if (v->length > 1)
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TEMPLATE(T, poly_factor_insert) (res, v, 1, ctx);
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TEMPLATE(T, poly_clear) (g, ctx);
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TEMPLATE(T, poly_clear) (h, ctx);
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TEMPLATE(T, poly_clear) (v, ctx);
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TEMPLATE(T, poly_clear) (x, ctx);
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fmpz_clear(q);
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}
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#endif
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