NAME
sqrt —
square root function
SYNOPSIS
#include
<math.h>
double
sqrt(double
x);
long double
sqrtl(long
double x);
float
sqrtf(float
x);
DESCRIPTION
The
sqrt()
function compute the non-negative square root of x.
SPECIAL VALUES
sqrt(-0) returns
-0.
sqrt(x)
returns a NaN and generates a domain error for x < 0.
VECTOR OPERATIONS
If you need to apply the sqrt() 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
vsqrtf(vFloat
x);
vFloat
vrsqrtf(vFloat
x);
void
vvsqrtf(float
*y, const float *x, const int
*n);
void
vvsqrt(double
*y, const double *x, const int
*n);
void
vvrsqrtf(float
*y, const float *x, const int
*n);
void
vvrsqrt(double
*y, const double *x, const int
*n);
SEE ALSO
STANDARDS
The sqrt() function conforms to ISO/IEC
9899:2011.