HP MLIB User's Guide Vol. 2 7th Ed.

814 HP MLIB User’s Guide
vsAtan, vdAtan The arctangent of the elements of a vector
Name vsAtan, vdAtan
The arctangent of the elements of a vector
Purpose vsAtan and vdAtan calculate the arctangent function of vector elements:
y[i] = atan(a[i]), for 0 <= i <= n-1
Usage VMATH:
#include <vmath.h>
void vsAtan (int n, const float a[ ], float y [ ] ) ;
void vdAtan (int n, const double a [ ], double y [ ] ) ;
VMATH8:
#include <vmath8.h>
void vsAtan (long long n, const float a[ ], float y [ ] ) ;
void vdAtan (long long n, const double a [ ], double y [ ] ) ;
Input n Number of elements to be calculated.
a Array of length at least n, specifying the input vector.
Output y Array of length at least n, specifying the output vector.