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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