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https://git.planet-casio.com/Lephenixnoir/OpenLibm.git
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7e5585aaca
This is a bit more consistent with the naming of the other header files (openlibm_complex.h and openlibm_fenv.h). Re-add an openlibm.h header that includes all of the public headers as a shorthand. Fix up all of the source files to include <openlibm_math.h> instead of <openlibm.h>. While there, fix ordering of the includes.
77 lines
2 KiB
C
77 lines
2 KiB
C
/* $OpenBSD: s_clog.c,v 1.6 2013/07/03 04:46:36 espie Exp $ */
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/*
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* Copyright (c) 2008 Stephen L. Moshier <steve@moshier.net>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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/* clog.c
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*
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* Complex natural logarithm
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*
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*
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*
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* SYNOPSIS:
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*
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* double complex clog();
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* double complex z, w;
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*
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* w = clog (z);
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*
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*
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*
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* DESCRIPTION:
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*
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* Returns complex logarithm to the base e (2.718...) of
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* the complex argument x.
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*
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* If z = x + iy, r = sqrt( x**2 + y**2 ),
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* then
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* w = log(r) + i arctan(y/x).
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*
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* The arctangent ranges from -PI to +PI.
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*
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*
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* ACCURACY:
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*
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* Relative error:
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* arithmetic domain # trials peak rms
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* DEC -10,+10 7000 8.5e-17 1.9e-17
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* IEEE -10,+10 30000 5.0e-15 1.1e-16
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*
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* Larger relative error can be observed for z near 1 +i0.
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* In IEEE arithmetic the peak absolute error is 5.2e-16, rms
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* absolute error 1.0e-16.
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*/
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#include <float.h>
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#include <openlibm_complex.h>
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#include <openlibm_math.h>
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double complex
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clog(double complex z)
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{
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double complex w;
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double p, rr;
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/*rr = sqrt( z->r * z->r + z->i * z->i );*/
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rr = cabs(z);
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p = log(rr);
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rr = atan2 (cimag (z), creal (z));
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w = p + rr * I;
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return (w);
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}
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#if LDBL_MANT_DIG == DBL_MANT_DIG
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__strong_alias(clogl, clog);
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#endif /* LDBL_MANT_DIG == DBL_MANT_DIG */
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