[Rd] wishlist: xlim in lines.polynomial (PR#9362)

From: <tpapp_at_princeton.edu>
Date: Mon 13 Nov 2006 - 19:00:00 GMT

Full_Name: Tamas K Papp
Version: 2.4.0
OS: linux
Submission from: (NULL) (

I was using the lines.polynomial method for plotting piecewise polynomials (parts of splines). I needed a feature to limit the range of plotting using a parameter given to the function (as opposed to par("usr")). I think that the following changes would be a nice addition:

lines.polynomial <- function (x, len = 100, xlim=par("usr")[1:2],

    p <- x
    x <- seq(xlim[1], xlim[2], len = len)
    y <- predict(p, x)

    y[y <= ylim[1] | y >= ylim[2]] <- NA     lines(x, y, ...)
Package:       polynom
Version:       1.2-3
Date:          2006-09-09

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