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))