inverse.form {marima}

inverse.form

Description

Calculation of inverse form for arma model

Usage

inverse.form(ar.poly, ma.poly, L)

Arguments

ar.poly

=autoregressive matrix part of model (array(k, k, ar-order)).

ma.poly

=moving average matrix part of model (array(k, k, ma-order)).

L

=order of return polynomial (length=L+1 including leading unity matrix).

Value

inverse form for arma model up to order L (array(k, k, L+1)).

Examples

set.seed(4711)
p1  <- check.one(matrix(rnorm(16), nrow=4))
p2  <- check.one(array(rnorm(32),dim=c(4, 4, 2)))
inverse <- inverse.form(ar.poly=p1, ma.poly=p2, L=6)
short.form(inverse)