| /* $NetBSD: cpow.c,v 1.1 2007/08/20 16:01:35 drochner Exp $ */ |
| |
| /*- |
| * Copyright (c) 2007 The NetBSD Foundation, Inc. |
| * All rights reserved. |
| * |
| * This code is derived from software written by Stephen L. Moshier. |
| * It is redistributed by the NetBSD Foundation by permission of the author. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS |
| * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
| * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS |
| * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| * POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "../src/namespace.h" |
| #include <complex.h> |
| #include <math.h> |
| |
| double complex |
| cpow(double complex a, double complex z) |
| { |
| double complex w; |
| double x, y, r, theta, absa, arga; |
| |
| x = creal(z); |
| y = cimag(z); |
| absa = cabs(a); |
| if (absa == 0.0) { |
| return (0.0 + 0.0 * I); |
| } |
| arga = carg(a); |
| r = pow(absa, x); |
| theta = x * arga; |
| if (y != 0.0) { |
| r = r * exp(-y * arga); |
| theta = theta + y * log(absa); |
| } |
| w = r * cos(theta) + (r * sin(theta)) * I; |
| return w; |
| } |