arma.roots: AR or MA Polynomial Roots

In wqmeeker/RTseries: Interactive Time Series Analysis Tools

AR or MA Polynomial Roots

Description

Compute and display an AR or an MA polynomial and its roots, relative to the 'unit circle'.

Usage

arma.roots(coeficients, nplot = 400, my.title = NULL, digits = 4)

Arguments

coeficients	A vector of coefficients of polynomial.
nplot	The number of points used to display the plot (default is 400).
my.title	If my.title = NULL, it will display coefficient on middle top of graph; otherwise, it will not display coeeficient on graph.
digits	The number of decimal places to be used in numeric output (default is 4).

Value

The roots of the polynomial are returned as a vector, but invisibly.

Examples

arma.roots(c(1.6,0.4))
arma.roots(c(.5,-.1))
arma.roots(c(.5,-.9,.1,.5))
# trivial (first order or linear polynomial) example
arma.roots(.5)

wqmeeker/RTseries documentation built on Dec. 31, 2022, 10 a.m.