mirror of
https://github.com/vale981/arb
synced 2025-03-05 09:21:38 -05:00
65 lines
1.7 KiB
C
65 lines
1.7 KiB
C
/*
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Copyright (C) 2018 Fredrik Johansson
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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 it under
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the terms of the GNU Lesser General Public License (LGPL) as published
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by the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version. See <http://www.gnu.org/licenses/>.
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*/
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#include "acb_mat.h"
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int
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main(void)
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{
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slong iter;
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flint_rand_t state;
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flint_printf("companion....");
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fflush(stdout);
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flint_randinit(state);
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for (iter = 0; iter < 100 * arb_test_multiplier(); iter++)
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{
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acb_mat_t A;
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acb_poly_t f, g;
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slong n, prec;
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acb_poly_init(f);
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acb_poly_init(g);
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do {
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acb_poly_randtest(f, state, 1 + n_randint(state, 8), 1 + n_randint(state, 1000), 10);
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} while (acb_poly_degree(f) < 0);
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n = acb_poly_degree(f);
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prec = 2 + n_randint(state, 200);
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acb_mat_init(A, n, n);
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acb_mat_randtest(A, state, 1 + n_randint(state, 1000), 10);
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acb_mat_companion(A, f, prec);
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acb_mat_charpoly(g, A, prec);
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acb_poly_scalar_mul(g, g, acb_poly_get_coeff_ptr(f, n), prec);
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if (!acb_poly_contains(g, f))
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{
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flint_printf("FAIL\n");
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flint_printf("A:\n"), acb_mat_printd(A, 15), flint_printf("\n");
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flint_printf("f:\n"), acb_poly_printd(f, 15), flint_printf("\n");
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flint_printf("g:\n"), acb_poly_printd(g, 15), flint_printf("\n");
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flint_abort();
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}
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acb_mat_clear(A);
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acb_poly_clear(f);
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acb_poly_clear(g);
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}
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flint_randclear(state);
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flint_cleanup();
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flint_printf("PASS\n");
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return 0;
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}
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