mirror of
https://github.com/vale981/arb
synced 2025-03-06 09:51:39 -05:00
59 lines
1.4 KiB
C
59 lines
1.4 KiB
C
/*
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Copyright (C) 2016 Arb authors
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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.h"
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int
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arb_intersection(arb_t z, const arb_t x, const arb_t y, slong prec)
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{
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arf_t left, right, t, xr, yr;
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int result;
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if (arf_is_nan(arb_midref(x)) || arf_is_nan(arb_midref(y)))
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{
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arb_indeterminate(z);
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return 1;
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}
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if (mag_is_inf(arb_radref(x)) && mag_is_inf(arb_radref(y)))
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{
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arb_zero_pm_inf(z);
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return 1;
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}
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result = arb_overlaps(x, y);
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if (result)
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{
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arf_init(left);
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arf_init(right);
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arf_init(t);
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arf_init_set_mag_shallow(xr, arb_radref(x));
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arf_init_set_mag_shallow(yr, arb_radref(y));
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arf_sub(left, arb_midref(x), xr, prec, ARF_RND_FLOOR);
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arf_sub(t, arb_midref(y), yr, prec, ARF_RND_FLOOR);
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arf_max(left, left, t);
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arf_add(right, arb_midref(x), xr, prec, ARF_RND_CEIL);
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arf_add(t, arb_midref(y), yr, prec, ARF_RND_CEIL);
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arf_min(right, right, t);
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arb_set_interval_arf(z, left, right, prec);
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arf_clear(left);
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arf_clear(right);
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arf_clear(t);
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}
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return result;
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}
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