# plot.polynom: Graphical display of polynomial objects In PolynomF: Polynomials in R

## Description

Standard displsy methods for polynomial or lists of polynomials.

## Usage

 ``` 1 2 3 4 5 6 7 8 9 10 11 12 13 14``` ```## S3 method for class 'polynom' plot(x, xlim = 0:1, ylim = range(Px), type = "l", xlab = "x", ylab = "p(x)", ..., len = 1000) ## S3 method for class 'polylist' plot(x, xlim = 0:1, ylim = range(Px), type = "l", xlab = "x", ylab = "P(x)", ..., len = 1000) ## S3 method for class 'polylist' lines(x, ..., len = 1000) ## S3 method for class 'polynom' lines(x, ..., len = 1000) ## S3 method for class 'polylist' points(x, ..., len = 100) ## S3 method for class 'polynom' points(x, ..., at = seq(pu[1], pu[2], len = len), len = 100) ```

## Arguments

 `x` A `polynom` or `polylist` object. `xlim, ylim, xlab, ylab, type` As for `plot`. `...` Additional arguments sent to `plot`, `points` or `lines` `len` The number of linear line segments to use to present the polynomial curve. `at` the \$x-\$values where the points are to appear.

## Details

`plot.polynom` will by default choose `x` limits to cover the (real parts of) the zeros, stationary points and points of inflexion of the ploynomial being plotted. `plot.polylist` chooses by default an x region to accommodate all polynomials on the list in this way. The current palette of colours is used for different components. `lines.polynom` may be used to add individual polynomials to the plot. The argument `len` may be used to increase or decrease the number of straight line segments used to represent the curves.

Nothing of use.

## Author(s)

Bill Venables, with contributions by Kurt Hornik.

Nont

`curve`

## Examples

 ```1 2 3 4 5 6 7``` ```x <- polynom() L <- polylist(1, 1-x) for(j in 2:10) L[[j+1]] <- (2*j - 1 - x)*L[[j]] - (j-1)^2*L[[j-1]] plot(L[1:5], xlim = c(0,5), xaxs = "r", ylab = expression(L[j](z)), xlab = "z", main = "Laguerre polynomials to degree 4") lines(L[[6]], col = "grey", lwd = 2) ```

PolynomF documentation built on May 17, 2018, 9:04 a.m.