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annotate packages/language/c/libm/current/src/complex/cexp.c @ 3292:7f8e529b4d82 default tip

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Fix FREESCALE_EDMA_NBYTES_MLOFFYES_MLOFF() so it works with negative offsets.
author vae
date Wed, 29 Apr 2015 23:31:48 +0000
parents 77f9d3253c3e
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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3260
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1 /* $NetBSD: cexp.c,v 1.1 2007/08/20 16:01:34 drochner Exp $ */
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2
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3 /*-
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4 * Copyright (c) 2007 The NetBSD Foundation, Inc.
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5 * All rights reserved.
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6 *
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7 * This code is derived from software written by Stephen L. Moshier.
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8 * It is redistributed by the NetBSD Foundation by permission of the author.
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9 *
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10 * Redistribution and use in source and binary forms, with or without
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11 * modification, are permitted provided that the following conditions
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12 * are met:
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13 * 1. Redistributions of source code must retain the above copyright
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14 * notice, this list of conditions and the following disclaimer.
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15 * 2. Redistributions in binary form must reproduce the above copyright
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16 * notice, this list of conditions and the following disclaimer in the
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17 * documentation and/or other materials provided with the distribution.
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18 *
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19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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29 * POSSIBILITY OF SUCH DAMAGE.
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30 *
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31 * imported and modified include for newlib 2010/10/03
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32 * Marco Atzeri <marco_atzeri@yahoo.it>
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33 */
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34
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35 /*
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36 FUNCTION
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37 <<cexp>>, <<cexpf>>---complex base-e exponential
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38
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39 INDEX
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40 cexp
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41 INDEX
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42 cexpf
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43
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44 ANSI_SYNOPSIS
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45 #include <complex.h>
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46 double complex cexp(double complex <[z]>);
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47 float complex cexpf(float complex <[z]>);
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48
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49
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50 DESCRIPTION
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51 These functions compute the complex base-<[e]> exponential of <[z]>.
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52
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53 <<cexpf>> is identical to <<cexp>>, except that it performs
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54 its calculations on <<floats complex>>.
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55
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56 RETURNS
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57 The cexp functions return the complex base-<[e]> exponential value.
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58
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59 PORTABILITY
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60 <<cexp>> and <<cexpf>> are ISO C99
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61
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62 QUICKREF
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63 <<cexp>> and <<cexpf>> are ISO C99
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64
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65 */
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66
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67
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68 #include <complex.h>
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69 #include <math.h>
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70
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71 double complex
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72 cexp(double complex z)
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73 {
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74 double complex w;
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75 double r, x, y;
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76
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77 x = creal(z);
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78 y = cimag(z);
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79 r = exp(x);
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80 w = r * cos(y) + r * sin(y) * I;
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81 return w;
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82 }