vatcatan - Vector complex arctangent tan-1(x)

20.9 vatcatan - Vector complex arctangent $tan-1(x)$

subroutine vatcatan (n, y, incy, x, incx); 
subroutine vatcatanf(n, y, incy, x, incx); 
 
subroutine vatcatan_64 (n, y, incy, x, incx); 
subroutine vatcatanf_64(n, y, incy, x, incx);

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

y= tan-1(x)

20.9.1 Parameters

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

20.9.2 Function Graphs

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