diff options
Diffstat (limited to 'nuttx/libc/math/lib_sinf.c')
-rw-r--r-- | nuttx/libc/math/lib_sinf.c | 104 |
1 files changed, 0 insertions, 104 deletions
diff --git a/nuttx/libc/math/lib_sinf.c b/nuttx/libc/math/lib_sinf.c deleted file mode 100644 index 9e493d8ef..000000000 --- a/nuttx/libc/math/lib_sinf.c +++ /dev/null @@ -1,104 +0,0 @@ -/************************************************************************ - * libc/math/lib_sinf.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) 2009-2011 Nick Johnson <nickbjohnson4224 at gmail.com> - * - * Permission to use, copy, modify, and distribute this software for any - * purpose with or without fee is hereby granted, provided that the above - * copyright notice and this permission notice appear in all copies. - * - * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES - * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF - * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR - * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES - * 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. - * - ************************************************************************/ - -/************************************************************************ - * Included Files - ************************************************************************/ - -#include <sys/types.h> -#include <math.h> - -/************************************************************************ - * Private Data - ************************************************************************/ - -static float _flt_inv_fact[] = -{ - 1.0 / 1.0, // 1 / 1! - 1.0 / 6.0, // 1 / 3! - 1.0 / 120.0, // 1 / 5! - 1.0 / 5040.0, // 1 / 7! - 1.0 / 362880.0, // 1 / 9! - 1.0 / 39916800.0, // 1 / 11! -}; - -/************************************************************************ - * Public Functions - ************************************************************************/ - -float sinf(float x) -{ - float x_squared; - float sin_x; - size_t i; - - /* Move x to [-pi, pi) */ - - x = fmodf(x, 2 * M_PI); - if (x >= M_PI) - { - x -= 2 * M_PI; - } - - if (x < -M_PI) - { - x += 2 * M_PI; - } - - /* Move x to [-pi/2, pi/2) */ - - if (x >= M_PI_2) - { - x = M_PI - x; - } - - if (x < -M_PI_2) - { - x = -M_PI - x; - } - - x_squared = x * x; - sin_x = 0.0; - - /* Perform Taylor series approximation for sin(x) with six terms */ - - for (i = 0; i < 6; i++) - { - if (i % 2 == 0) - { - sin_x += x * _flt_inv_fact[i]; - } - else - { - sin_x -= x * _flt_inv_fact[i]; - } - - x *= x_squared; - } - - return sin_x; -} |