vssub - Vector scalar subtraction x-α

15.4 vssub - Vector scalar subtraction $x -α$

subroutine vssub (n, y, incy, x, incx, a); 
subroutine vssubf(n, y, incy, x, incx, a); 
 
subroutine vssub_64 (n, y, incy, x, incx, a); 
subroutine vssubf_64(n, y, incy, x, incx, a);

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

y= x- α

15.4.1 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 REAL: 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.
A - REAL: ENTRY: Scalar constant $α$ .

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