expand.polynom | R Documentation |
Create a formula representing a polynomial, or expand polynomials in an existing formula.
expand.polynom(f)
sympoly(x, y, n)
f |
A formula. |
x , y |
Variable names. |
n |
Integer specifying the degree of the polynomial.
(If |
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
.
A formula
.
.
polynom
sympoly(A, 4)
sympoly(A, B, 3)
expand.polynom(U ~ A + polynom(B, 2))
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