salad (version 1.2)

matmult: Matrix Arithmetic

Description

Methods and functions for dual matrix arithmetic

Usage

matrixprod_dn(x, y)
matrixprod_nd(x, y)
matrixprod_dd(x, y)
# S4 method for dual,numericOrArray
%*%(x, y)
# S4 method for numericOrArray,dual
%*%(x, y)
# S4 method for dual,dual
%*%(x, y)
# S4 method for dual,dual
crossprod(x, y)
# S4 method for dual,numericOrArray
crossprod(x, y)
# S4 method for numericOrArray,dual
crossprod(x, y)
# S4 method for dual,missing
crossprod(x, y)
# S4 method for dual,dual
tcrossprod(x, y)
# S4 method for dual,numericOrArray
tcrossprod(x, y)
# S4 method for numericOrArray,dual
tcrossprod(x, y)
# S4 method for dual,missing
tcrossprod(x, y)

Value

A dual object.

Arguments

x, y

Dual or numeric matrices or vectors

Details

All methods are the analog of the corresponding methods for matrices. The functions `matrixprod_dd`, `matrixprod_nd` and `matrixprod_dn` are for multiplication of two dual objects, of a numeric and a dual object, or of a dual and a numeric object, respectively. You may use these functions to save the method dispatching time.

Examples

x <- dual( matrix(c(0,1,3,1), 2, 2) )
y <- x %*% c(2,-2)
d(y, "x1.1")