vcreal - Vector complex real compoment Re(x)

16.1 vcreal - Vector complex real compoment $Re(x)$

subroutine vcreal (n, y, incy, x, incx); 
subroutine vcrealf(n, y, incy, x, incx); 
 
subroutine vcreal_64 (n, y, incy, x, incx); 
subroutine vcrealf_64(n, y, incy, x, incx);

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

y= Re(x)

Where $x∈ C$ and $y∈ R$ .

16.1.1 Parameters

N - INTEGER: ENTRY: Number of elements of $x$ and $y$ .
CONSTRAINT: $n ≥1$ .
Y - ARRAY OF REAL: 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.

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