dadd: Add two double-precision vectors.

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

Add two double-precision vectors.

Description

Compute double precision DY := DX + DY for N elements, applying the specified storage increments. This routine mirrors the BLAS DAXPY operation with a unit scaling factor.

Usage

dadd(N = NULL, X, INCX = 1L, Y, INCY = 1L)

Arguments

N	number of elements in the input vectors. Defaults to the length of X if NULL.
X	double precision vector or matrix providing the addend.
INCX	storage spacing between elements of X.
Y	double precision vector or matrix that is updated in place.
INCY	storage spacing between elements of Y.

Details

The implementation delegates to the BLAS DAXPY routine with a unit scaling factor, making it equivalent to daxpy(1.0, X, Y) while exposing an interface consistent with other low-level wrappers such as dcopy and dscal.

Value

The modified object Y containing the element-wise sums.

Examples

set.seed(4669)
X <- matrix(runif(6), 3, 2)
Y <- matrix(runif(6), 3, 2)
dadd(X = X, Y = Y)
all.equal(Y, X + Y)

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