copysign(3) BSD Library Functions Manual copysign(3)
NAME
copysign -- changes the sign of x to that of y
SYNOPSIS
#include <math.h>
double
copysign(double x, double y);
long double
copysignl(long double x, long double y);
float
copysignf(float x, float y);
DESCRIPTION
The copysign() functions return x with its sign changed to y's.
SPECIAL VALUES
copysign(x, y) returns a NaN (with y's sign) if x is a NaN.
VECTOR OPERATIONS
If you need to apply the copysign() functions to SIMD vectors or arrays,
using the following functions provided by the Accelerate.framework may
give significantly better performance:
#include <Accelerate/Accelerate.h>
vFloat vcopysignf(vFloat x, vFloat y);
void vvcopysignf(float *z, const float *y, const float *x, const int *n);
void vvcopysign(double *z, const double *y, const double *x, const int
*n);
STANDARDS
The copysign() functions conform to ISO/IEC 9899:2011.
BSD December 11, 2006 BSD
Mac OS X 10.9.1 - Generated Tue Jan 7 08:23:48 CST 2014