vatan2 - Vector arctangent tan-1(x/y)

6.7 vatan2 - Vector arctangent $tan-1(x/y)$

#include <mvec.h> 
 
void vatan2 (int n, double *restrict z, int incz, const double *restrict x, 
             int incx, const double *restrict y, int incy); 
void vatan2f(int n, float *restrict z, int incz, const float *restrict x, 
             int incx, const float *restrict y, int incy); 
 
void vatan2_64 (long n, double *restrict z, long incz, const double *restrict x, 
                long incx, const double *restrict y, long incy); 
void vatan2f_64(long n, float *restrict z, long incz, const float *restrict x, 
                long incx, const float *restrict y, long incy);

Given input vectors $x$ and $y$ and a result vector $z$ , this function computes:

z= tan -1(x/y)

6.7.1 Parameters

N - INTEGER: ENTRY: Number of elements of $x$ , $y$ and $z$ .
CONSTRAINT: $n ≥1$ .
Z - ARRAY OF REAL: EXIT: Result vector $z$ .
CONSTRAINT: Must contain $n× incz$ elements.
CONSTRAINT: Must not overlap with array $x$ or $y$ .
INCZ - INTEGER: ENTRY: Stride for the vector $z$ .
CONSTRAINT: $incz̸= 0$ .
BEHAVIOR: A negative stride will traverse the array in reverse.
X - ARRAY OF REAL: ENTRY: Input vector $x$ .
CONSTRAINT: Must contain $n× incx$ elements.
CONSTRAINT: Must not overlap with array $z$ or $y$ .
INCX - INTEGER: ENTRY: Stride for the vector $x$ .
CONSTRAINT: $incx̸= 0$ .
BEHAVIOR: A negative stride will traverse the array in reverse.
Y - ARRAY OF REAL: ENTRY: Input vector $y$ .
CONSTRAINT: Must contain $n× incy$ elements.
CONSTRAINT: Must not overlap with array $z$ or $x$ .
INCY - INTEGER: ENTRY: Stride for the vector $y$ .
CONSTRAINT: $incy̸= 0$ .
BEHAVIOR: A negative stride will traverse the array in reverse.

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