| expand.polynom {spatstat.utils} | R Documentation |
Expand Symbolic Polynomials in a Formula
Description
Create a formula representing a polynomial, or expand polynomials in an existing formula.
Usage
expand.polynom(f)
sympoly(x, y, n)
Arguments
f |
A formula. |
x, y |
Variable names. |
n |
Integer specifying the degree of the polynomial.
(If |
Details
These functions expand a polynomial into its homogeneous terms and return a model formula.
sympoly(x, n) creates a formula whose right-hand side represents the
polynomial of degree n in the variable x. Each
homogeneous term x^k is a separate term in the formula.
sympoly(x, y, n) creates a formula representing the
polynomial of degree n in the two variables x and
y.
If f is a formula containing a term of the form
polynom(...) then expand.polynom(f) replaces this term
by its expansion as a sum of homogeneous terms, as defined in
the help for polynom.
Value
A formula.
Author(s)
Adrian Baddeley Adrian.Baddeley@curtin.edu.au, Rolf Turner rolfturner@posteo.net and Ege Rubak rubak@math.aau.dk.
See Also
Examples
sympoly(A, 4)
sympoly(A, B, 3)
expand.polynom(U ~ A + polynom(B, 2))