polynomial | R Documentation |
Construct, coerce to, test for, and print polynomial objects.
polynomial(coef = c(0, 1)) as.polynomial(p) is.polynomial(p) ## S3 method for class 'polynomial' as.character(x, decreasing = FALSE, ...) ## S3 method for class 'polynomial' print(x, digits = getOption("digits"), decreasing = FALSE, ...)
coef |
numeric vector, giving the polynomial coefficients in increasing order. |
p |
an arbitrary R object. |
x |
a |
decreasing |
a logical specifying the order of the terms; in increasing (default) or decreasing powers. |
digits |
the number of significant digits to use for printing. |
... |
potentially further arguments passed to and from other methods. |
polynomial
constructs a polynomial from its coefficients,
i.e., p[1:k]
specifies the polynomial
p[1] + p[2]* x + p[3]* x^2 + ... + p[k]* x^(k-1).
Internally, polynomials are simply numeric coefficient vectors of
class "polynomial"
. Several useful methods are available for
this class, such as coercion to character (as.character()
) and
function (as.function.polynomial
), extraction of
the coefficients (coef()
), printing (using as.character
),
plotting (plot.polynomial
), and computing sums and
products of arbitrarily many polynomials.
as.polynomial
tries to coerce its arguments to a polynomial.
is.polynomial
tests whether its argument is a polynomial (in
the sense that it has class "polynomial"
.
polynomial(1:4) p <- as.polynomial(c(1,0,3,0)) p print(p, decreasing = TRUE) stopifnot(coef(p) == c(1,0,3)) polynomial(c(2,rep(0,10),1))
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