polynomial (version 0.1.0)

polynomial: Polynomials

Description

Functions to create, coerce and check for polynomials.

Usage

polynomial(length = 0)
as.polynomial(x, exponents = NULL, ...)
is.polynomial(x)

Arguments

length

A non-negative integer specifying the desired length. Double values will be coerced to integer: supplying an argument of length other than one is an error.

x

object to be coerced or tested.

exponents

NULL or an integer vector of the same length as x.

…

further arguments passed to as.numbers.

Value

polynomial and as.polynomial both return polynomial objects.

is.polynomial returns TRUE or FALSE depending on whether its argument is a polynomial or not.

Details

polynomial creates a double-precision vector of the specified length with each coefficient equal to 0 and exponents equal to seq(0L, length.out = length).

as.polynomial returns x if x is a polynomial. If not, it attempts to coerce its argument to be of double or complex type: most attributes will be stripped (excluding dim, dimnames and names). Finally, the "class" and "exponents" attibutes are populated.

Examples

# NOT RUN {
as.polynomial(c(0, 4, 2, -1))


## 'as.polynomial' reduces complex numbers to real numbers if appropriate.
## You can use 'strict = FALSE' to stop this conversion.
as.polynomial(complex(real = c(0, 4, 2, -1)))
as.polynomial(complex(real = c(0, 4, 2, -1)), strict = FALSE)
# }