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author | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2012-10-28 18:42:09 +0000 |
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committer | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2012-10-28 18:42:09 +0000 |
commit | 2e745de2f7768f4932e365f0a49edbe15a448818 (patch) | |
tree | 73b8411e1d00ef6df3dd5fa2ed717241174ae14b /nuttx/lib/math/lib_tanh.c | |
parent | 83edd56f6581555c199f3cc3a96ed80f58554c1a (diff) | |
download | px4-nuttx-2e745de2f7768f4932e365f0a49edbe15a448818.tar.gz px4-nuttx-2e745de2f7768f4932e365f0a49edbe15a448818.tar.bz2 px4-nuttx-2e745de2f7768f4932e365f0a49edbe15a448818.zip |
lib/math files not follow coding standard; float, double, and long double versions in separate files to reduce size of dumb link
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@5270 42af7a65-404d-4744-a932-0658087f49c3
Diffstat (limited to 'nuttx/lib/math/lib_tanh.c')
-rw-r--r-- | nuttx/lib/math/lib_tanh.c | 48 |
1 files changed, 29 insertions, 19 deletions
diff --git a/nuttx/lib/math/lib_tanh.c b/nuttx/lib/math/lib_tanh.c index c6a1a1c87..5cc1d9176 100644 --- a/nuttx/lib/math/lib_tanh.c +++ b/nuttx/lib/math/lib_tanh.c @@ -1,4 +1,14 @@ -/* +/************************************************************************ + * lib/math/lib_tanh.c + * + * This file is a part of NuttX: + * + * Copyright (C) 2012 Gregory Nutt. All rights reserved. + * Ported by: Darcy Gong + * + * It derives from the Rhombs OS math library by Nick Johnson which has + * a compatibile, MIT-style license: + * * Copyright (C) 2009, 2010 Nick Johnson <nickbjohnson4224 at gmail.com> * * Permission to use, copy, modify, and distribute this software for any @@ -12,28 +22,28 @@ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. - */ + * + ************************************************************************/ -#include <apps/math.h> -#include <float.h> +/************************************************************************ + * Included Files + ************************************************************************/ -float tanhf(float x) { - float x0 = expf(x); - float x1 = 1.0 / x0; +#include <nuttx/config.h> +#include <nuttx/compiler.h> - return ((x0 + x1) / (x0 - x1)); -} - -double tanh(double x) { - double x0 = exp(x); - double x1 = 1.0 / x0; +#include <math.h> - return ((x0 + x1) / (x0 - x1)); -} +/************************************************************************ + * Public Functions + ************************************************************************/ -long double tanhl(long double x) { - long double x0 = exp(x); - long double x1 = 1.0 / x0; +#if CONFIG_HAVE_DOUBLE +double tanh(double x) +{ + double x0 = exp(x); + double x1 = 1.0 / x0; - return ((x0 + x1) / (x0 - x1)); + return ((x0 + x1) / (x0 - x1)); } +#endif |