tfarima (version 0.4.1)

nabla.ucarima: Unscramble I polynomial

Description

nabla multiplies the I polynomials of an object of the um class.

Usage

# S3 method for ucarima
nabla(x, i = NULL, lp = TRUE, ...)
nabla(x, ...)
# S3 method for um
nabla(x, ...)

Value

A numeric vector c(1, a1, ..., ad)

Arguments

x

an object of class um.

i

integer. Omit this component model.

lp

logical indicating the type of return: lagpol object or numeric vector.

...

additional arguments.

Examples

um1 <- um(i = "(1 - B)(1 - B^12)")
nabla(um1)