dsymm: Symmetric matrix-matrix multiplication

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

Symmetric matrix-matrix multiplication

Description

Computes C := \alpha \operatorname{op}(A) B + \beta C when 'A' is symmetric.

Usage

dsymm(
  SIDE = "L",
  UPLO = "U",
  M = NULL,
  N = NULL,
  ALPHA = 1,
  A,
  LDA = NULL,
  B,
  LDB = NULL,
  BETA = 0,
  C,
  LDC = NULL
)

Arguments

SIDE	Character specifying whether 'A' multiplies from the left ('"L"') or right ('"R"').
UPLO	Character indicating whether 'A' stores the upper ('"U"') or lower ('"L"') triangle.
M, N	Optional integers for the output dimensions.
ALPHA, BETA	Numeric scalars.
A	Symmetric matrix or big.matrix.
LDA, LDB, LDC	Leading dimensions.
B	Input matrix.
C	Optional output container updated in place.

Value

Invisibly returns 'C'.

Examples

A <- matrix(c(2, 1, 1, 3), 2, 2)
B <- diag(2)
C <- matrix(0, 2, 2)
dsymm(A = A, B = B, C = C)
C

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