marima (version 2.2)

short.form: short.form

Description

Function to condensate (and/or) print out matrix polynomium leaving out empty lag matrices and, if specified, the leading (unity) matrix.

Usage

short.form(poly = NULL, name = "Lag=", leading = TRUE, tail = FALSE, digits = 6)

Arguments

poly

matrix polynomium (0-1 array as construced by define.model, for example, or array of reals as estimated by marima).

name

character string used as header in output (default='lag').

leading

TRUE/FALSE. If leading=FALSE the leading (unity matrix) is to be left out/suppressed.

tail

TRUE/FALSE. If TRUE and the ar/ma-model only consists of coefficient matrice(s) where all coefficients (except the leading unity matrix) are all zero a first order coefficient matrix (being zero) is retained (in order to avoid a model containing only the leading unity matrix).

If tail=TRUE and the coefficients in the first coefficient matrix (after the leading unity matrix) are all zero, the leading unity matrix is always retained.

digits

the number of digits retained by short.form (default=6).

Examples

Model<-define.model(kvar=4, ar=c(1, 2, 4), ma=c(1), reg.var=4)
short.form(Model$ar.pattern)
short.form(Model$ma.pattern)
short.form(Model$ar.pattern, leading=FALSE)
short.form(Model$ar.pattern, leading=FALSE)
#
M<-define.model(kvar=4, ma=c(1))
short.form(M$ar.pattern)
short.form(M$ar.pattern, tail=TRUE)
short.form(M$ar.pattern, leading=FALSE, tail=TRUE)