polyMul {astsa}

Multiplication of Two Polynomials

Description

Multiplication of two polynomials.

Usage

polyMul(p, q)

Arguments

p

coefficients of first polynomial

q

coefficients of second polynomial

Details

inputs are vectors of coefficients a, b, c, ..., in order of power ax^0 + bx^1 + cx^2 + ...

Value

coefficients of the product in order of power

Author(s)

D.S. Stoffer

Source

based on code from the polynom package https://CRAN.R-project.org/package=polynom

References

You can find demonstrations of astsa capabilities at FUN WITH ASTSA.

The most recent version of the package can be found at https://github.com/nickpoison/astsa/.

In addition, the News and ChangeLog files are at https://github.com/nickpoison/astsa/blob/master/NEWS.md.

The webpages for the texts and some help on using R for time series analysis can be found at https://nickpoison.github.io/.

Examples

a = 1:3  # 1 + 2x + 3x^2
b = 1:2  # 1 + 2x
polyMul(a, b)
# [1] 1 4 7 6
# 1 + 4x + 7x^2 + 6x^3