Last change
on this file since 444 was
444,
checked in by satin@…, 6 years ago
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add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc
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File size:
1.2 KB
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Rev | Line | |
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[444] | 1 | /* $NetBSD: carg.c,v 1.1 2007/08/20 16:01:31 drochner Exp $ */ |
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| 2 | |
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| 3 | /* |
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| 4 | * Written by Matthias Drochner <drochner@NetBSD.org>. |
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| 5 | * Public domain. |
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| 6 | * |
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| 7 | * imported and modified include for newlib 2010/10/03 |
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| 8 | * Marco Atzeri <marco_atzeri@yahoo.it> |
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| 9 | */ |
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| 10 | |
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| 11 | /* |
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| 12 | FUNCTION |
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| 13 | <<carg>>, <<cargf>>---argument (phase angle) |
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| 14 | |
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| 15 | INDEX |
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| 16 | carg |
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| 17 | INDEX |
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| 18 | cargf |
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| 19 | |
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| 20 | SYNOPSIS |
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| 21 | #include <complex.h> |
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| 22 | double carg(double complex <[z]>); |
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| 23 | float cargf(float complex <[z]>); |
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| 24 | |
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| 25 | |
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| 26 | DESCRIPTION |
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| 27 | These functions compute the argument (also called phase angle) |
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| 28 | of <[z]>, with a branch cut along the negative real axis. |
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| 29 | |
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| 30 | <<cargf>> is identical to <<carg>>, except that it performs |
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| 31 | its calculations on <<floats complex>>. |
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| 32 | |
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| 33 | RETURNS |
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| 34 | @ifnottex |
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| 35 | The carg functions return the value of the argument in the |
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| 36 | interval [-pi, +pi] |
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| 37 | @end ifnottex |
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| 38 | @tex |
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| 39 | The carg functions return the value of the argument in the |
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| 40 | interval [$-\pi$, $+\pi$] |
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| 41 | @end tex |
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| 42 | |
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| 43 | PORTABILITY |
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| 44 | <<carg>> and <<cargf>> are ISO C99 |
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| 45 | |
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| 46 | QUICKREF |
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| 47 | <<carg>> and <<cargf>> are ISO C99 |
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| 48 | |
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| 49 | */ |
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| 50 | |
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| 51 | #include <complex.h> |
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| 52 | #include <math.h> |
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| 53 | |
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| 54 | double |
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| 55 | carg(double complex z) |
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| 56 | { |
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| 57 | |
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| 58 | return atan2( cimag(z) , creal(z) ); |
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| 59 | } |
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