__SINCOSPI(3) BSD Library Functions Manual __SINCOSPI(3)NAME
__sincospi -- sine-pi and cosine-pi function
SYNOPSIS
#include <math.h>
float
__sincospif(float x, float *sinp, float *cosp);
double
__sincospi(double x, double *sinp, double *cosp);
DESCRIPTION
The __sincospi() function computes the sine and cosine of pi times x (measured in radians) and stores the sine in the memory pointed to by
sinp and the cosine in the memory pointed to by cosp.
SPECIAL VALUES
__sincospi() produces the same results as separate calls to __sinpi() and __cospi().
SEE ALSO __cospi(3), __sinpi(3), __tanpi(3), math(3)BSD December 15, 2012 BSD
Check Out this Related Man Page
__COSPI(3) BSD Library Functions Manual __COSPI(3)NAME
__cospi -- cosine-pi function
SYNOPSIS
#include <math.h>
float
__cospif(float x);
double
__cospi(double x);
DESCRIPTION
The __cospi() function returns the cosine of pi times x (measured in radians). This can be computed more accurately than cos(M_PI * x),
because it can implicitly use as many bits of pi as are necessary to deliver a well-rounded result, instead of the 53-bits to which M_PI is
limited. For large x it may also be more efficient, as the argument reduction involved is significantly simpler.
This function may be especially useful for working with degrees; whereas cos(M_PI * x / 180.0) cannot produce exact results for angles that
naively "should" be exact, like 90 degrees, __cospi(x / 180.0) can be computed exactly.
SPECIAL VALUES
__cospi(-x) is the same as __cospi(x) for any finite x.
__cospi(n) returns +1 for any even integer n.
__cospi(n) returns -1 for any odd integer n.
__cospi(n + 0.5) returns +0 for any integer n.
__cospi(+-infinity) raises the invalid floating-point exception and returns NaN.
VECTOR OPERATIONS
If you need to apply the __cospi() function to SIMD vectors or arrays, using the following functions provided by the Accelerate.framework may
be useful:
#include <Accelerate/Accelerate.h>
vFloat vcospif(vFloat x);
void vvcospif(float *y, float *x, const int n);
void vvcospi(double *y, double *x, const int n);
SEE ALSO __sinpi(3), __tanpi(3), __sincospi(3), math(3)BSD December 15, 2012 BSD
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