Mirrors_Framework/nuttx
1
0
Fork 0
mirror of https://github.com/apache/nuttx.git synced 2026-06-06 16:50:55 +08:00
Code Issues Actions Packages Projects Releases Wiki Activity

libc/math/lib_asin.c: The function did not convert for some input values. Asin did not convert for values which do not belong to the domain of the function. But aside of that the function also did not convert for sine allowed values. I achieved a conversion of the function by reducing the DBL_EPSION and by checking if the input value is in the domain of the function. This is a fix for the problem but the function should always terminate after a given number of iterations. From Stefan Kolb.

Browse Source
This commit is contained in:
Stefan Kolb
2015-09-01 08:45:14 -06:00
committed by Gregory Nutt
parent bb385c242f
commit 5ac6de118e
3 changed files with 35 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files
libc/math/lib_asin.c
+18 -2
View File
@@ -3,7 +3,7 @@
*
* This file is a part of NuttX:
*
* Copyright (C) 2012 Gregory Nutt. All rights reserved.
* Copyright (C) 2012, 2015 Gregory Nutt. All rights reserved.
* Ported by: Darcy Gong
*
* It derives from the Rhombs OS math library by Nick Johnson which has
@@ -35,6 +35,13 @@
#include <math.h>
#include <float.h>
/************************************************************************
* Pre-processor Definitions
************************************************************************/
#undef DBL_EPSILON
#define DBL_EPSILON 1e-12
/************************************************************************
* Public Functions
************************************************************************/
@@ -42,7 +49,16 @@
#ifdef CONFIG_HAVE_DOUBLE
double asin(double x)
{
long double y, y_sin, y_cos;
long double y;
long double y_sin;
long double y_cos;
/* Verify that the input value is in the domain of the function */
if (x < -1.0 || x > 1.0)
{
return NAN;
}
y = 0;