mvp (version 1.0-8)

mvp: Multivariate polynomials, mvp objects

Description

Create, test for, an coerce to, mvp objects

Usage

mvp(vars, powers, coeffs)
is_ok_mvp(vars,powers,coeffs)
is.mvp(x)
as.mvp(x,...)

Arguments

vars

List of variables comprising each term of an mvp object

powers

List of powers corresponding to the variables of the vars argument

coeffs

Numeric vector corresponding to the coefficients to each element of the var and powers lists

x

Object possibly of class mvp

...

Further arguments, passed to the methods

Details

Function mvp() is the formal creation mechanism for mvp objects. However, it is not very user-friendly; it is better to use as.mvp() in day-to-day use.

Function is_ok_mvp() checks for consistency of its arguments.

Examples

# NOT RUN {
mvp(list("x" , c("x","y"), "a",c("y","x")),list(1,1:2,3,c(-1,4)),1:4)

## Note how the terms appear in an arbitrary order, as do
## the symbols within a term.


kahle  <- mvp(
    vars   = split(cbind(letters,letters[c(26,1:25)]),rep(seq_len(26),each=2)),
    powers = rep(list(1:2),26),
    coeffs = 1:26
)

## again note arbitrary order of terms and symbols within a term




# }