1 /* origin: OpenBSD /usr/src/lib/libm/src/s_catanh.c */
3 * Copyright (c) 2008 Stephen L. Moshier <steve@moshier.net>
5 * Permission to use, copy, modify, and distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18 * Complex inverse hyperbolic tangent
23 * double complex catanh();
24 * double complex z, w;
31 * Inverse tanh, equal to -i catan (iz);
36 * arithmetic domain # trials peak rms
37 * IEEE -10,+10 30000 2.3e-16 6.2e-17
43 double complex catanh(double complex z)
46 return -1.0 * I * catan(z * I);