FABS(3) | Library Functions Manual | FABS(3) |
fabs
—
floating-point absolute value function
#include
<math.h>
double
fabs
(double
x);
long double
fabsl
(long
double x);
float
fabsf
(float
x);
The
fabs
()
functions compute the absolute value of a floating-point number
x.
fabs
(±0)
returns 0.
fabs
(±infinity)
returns +infinity.
If you need to apply the fabs
() 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
vfabsf
(vFloat
x);
void
vvfabsf
(
float *y, const float *x, const
int *n);
void
vvfabs
(double
*y, const double *x, const int
*n);
The fabs
() functions conform to ISO/IEC
9899:2011.
December 11, 2006 | macOS 14.6 |