ASIN(3) | Library Functions Manual | ASIN(3) |
asin
— arc sine
function
#include
<math.h>
double
asin
(double
x);
long double
asinl
(long
double x);
float
asinf
(float
x);
The
asin
()
function computes the principal value of the arc sine of
x. The result is in the range
[-pi/2, +pi/2].
asin
(±0)
returns ±0.
asin
(x)
returns a NAN and raises the "invalid" floating-point exception
for |x| > 1.
If you need to apply the asin
() function
to SIMD vectors or arrays, using the following functions provided by the
Accelerate.framework may give significantly better performance:
#include
<Accelerate/Accelerate.h>
vFloat
vasinf
(vFloat
x);
void
vvasinf
(float
*y, const float *x, const int
*n);
void
vvasin
(double
*y, const double *x, const int
*n);
acos(3), atan(3), atan2(3), cos(3), cosh(3), sin(3), sinh(3), tan(3), tanh(3), math(3)
The asin
() function conforms to ISO/IEC
9899:2011.
December 11, 2006 | macOS 14.6 |