03-20-2006
The code you have gave me this answer
4159061234|10:00|10:01|a1|a2|60|4
4159061234|10:00|10:06|b1|b2|360|4
4159061234|10:05|10:06|c1|c2|60|4
4159061234|10:12|10:15|d1|d2|180|4
3045678934|10:25|10:28|x1|x2|180|3
3045678934|10:25|10:30|y1|y2|300|3
3045678934|10:28|10:31|z1|z2|180|3
It is not what I expected to get.
Thanks,
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__SINPI(3) BSD Library Functions Manual __SINPI(3)
NAME
__sinpi -- sine-pi function
SYNOPSIS
#include <math.h>
float
__sinpif(float x);
double
__sinpi(double x);
DESCRIPTION
The __sinpi() function returns the sine of pi times x (measured in radians). This can be computed more accurately than sin(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 sin(M_PI * x / 180.0) cannot produce exact results for angles that
naively "should" be exact, like 180 degrees, __sinpi(x / 180.0) can be computed exactly.
SPECIAL VALUES
__sinpi(-x) is the same as - __sinpi(x) for any finite x.
__sinpi(+-0) returns +-0.
__sinpi(n) returns +0 for any positive integer n.
__sinpi(n + 0.5) returns +1 for any even integer n.
__sinpi(n + 0.5) returns -1 for any odd integer n.
__sinpi(+-infinity) raises the invalid floating-point exception and returns NaN.
VECTOR OPERATIONS
If you need to apply the __sinpi() function to SIMD vectors or arrays, using the following functions provided by the Accelerate.framework may
be useful:
#include <Accelerate/Accelerate.h>
vFloat vsinpif(vFloat x);
void vvsinpif(float *y, float *x, const int n);
void vvsinpi(double *y, double *x, const int n);
SEE ALSO
__cospi(3), __tanpi(3), __sincospi(3), math(3)
BSD
December 15, 2012 BSD