matmult {salad}

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 signature 'dual,numericOrArray'
x %*% y

## S4 method for signature 'numericOrArray,dual'
x %*% y

## S4 method for signature 'dual,dual'
x %*% y

## S4 method for signature 'dual,dual'
crossprod(x, y)

## S4 method for signature 'dual,numericOrArray'
crossprod(x, y)

## S4 method for signature 'numericOrArray,dual'
crossprod(x, y)

## S4 method for signature 'dual,missing'
crossprod(x, y)

## S4 method for signature 'dual,dual'
tcrossprod(x, y)

## S4 method for signature 'dual,numericOrArray'
tcrossprod(x, y)

## S4 method for signature 'numericOrArray,dual'
tcrossprod(x, y)

## S4 method for signature 'dual,missing'
tcrossprod(x, y)

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.

Value

A dual object.

Examples

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