mirror of
https://github.com/vale981/arb
synced 2025-03-06 09:51:39 -05:00
81 lines
2.1 KiB
C
81 lines
2.1 KiB
C
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/*
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Copyright (C) 2017 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 "arb_hypgeom.h"
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int main()
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{
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slong iter;
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flint_rand_t state;
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flint_printf("central_bin_ui....");
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fflush(stdout);
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flint_randinit(state);
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for (iter = 0; iter < 1000 * arb_test_multiplier(); iter++)
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{
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arb_t b1, b2, t;
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ulong n;
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slong prec1, prec2, acc1;
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n = n_randtest(state);
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prec1 = 2 + n_randint(state, 1000);
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prec2 = prec1 + 30;
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arb_init(b1);
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arb_init(b2);
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arb_init(t);
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arb_hypgeom_central_bin_ui(b1, n, prec1);
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arb_set_ui(t, n);
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arb_add_ui(t, t, n, prec2);
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arb_add_ui(t, t, 1, prec2);
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arb_gamma(t, t, prec2);
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arb_set_ui(b2, n);
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arb_add_ui(b2, b2, 1, prec2);
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arb_rgamma(b2, b2, prec2);
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arb_mul(b2, b2, b2, prec2);
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arb_mul(b2, b2, t, prec2);
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if (!arb_overlaps(b1, b2))
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{
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flint_printf("FAIL: overlap\n\n");
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flint_printf("n = %wu\n\n", n);
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flint_printf("b1 = "); arb_printn(b1, 50, 0); flint_printf("\n\n");
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flint_printf("b2 = "); arb_printn(b2, 50, 0); flint_printf("\n\n");
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flint_abort();
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}
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acc1 = arb_rel_accuracy_bits(b1);
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if (acc1 < prec1 - 2)
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{
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flint_printf("FAIL: poor accuracy\n\n");
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flint_printf("prec1 = %wd, acc1 = %wd\n", prec1, acc1);
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flint_printf("b1 = "); arb_printn(b1, prec1 / 3.33, 0); flint_printf("\n\n");
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flint_printf("b2 = "); arb_printn(b2, prec2 / 3.33, 0); flint_printf("\n\n");
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flint_abort();
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}
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arb_clear(b1);
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arb_clear(b2);
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arb_clear(t);
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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 EXIT_SUCCESS;
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}
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