dvcal: Generalised AXPBY operation

In bigalgebra: 'BLAS' and 'LAPACK' Routines for Native R Matrices and 'big.matrix' Objects

Generalised AXPBY operation

Description

Computes the linear combination Y := \alpha X + \beta Y in place.

Usage

dvcal(N = NULL, ALPHA = 1, X, INCX = 1L, BETA = 1, Y, INCY = 1L)

Arguments

N	Optional integer giving the number of elements. Defaults to 'length(X)'.
ALPHA	Numeric scalar multiplying 'X'.
X	Double-precision vector, matrix or ['bigmemory::big.matrix'] input.
INCX	Integer stride for traversing 'X'.
BETA	Numeric scalar multiplying 'Y'.
Y	Double-precision object updated in place.
INCY	Integer stride for traversing 'Y'.

Value

Invisibly returns the modified 'Y'.

Examples

x <- 1:5
y <- rep(2, 5)
dvcal(ALPHA = 2, X = x, BETA = -1, Y = y)
y

bigalgebra documentation built on Sept. 9, 2026, 5:12 p.m.