[Rd] I wish xlim=c(0, NA) would work. How about I send you a patch?

[ghostwheel]

The following seems to work well, and I don't think it'll break anything.
The only problem I see is if someone says xlim=c(min=9, max=0), which should
give an error/warning message, but won't.

Michael
---
plot.default=
function (x, y = NULL, type = "p", xlim = NULL, ylim = NULL,
      log = "", main = NULL, sub = NULL, xlab = NULL, ylab = NULL,
      ann = par("ann"), axes = TRUE, frame.plot = axes, panel.first = NULL,
      panel.last = NULL, asp = NA, ...)
  {
        localAxis <- function(..., col, bg, pch, cex, lty, lwd) Axis(...)
            localBox <- function(..., col, bg, pch, cex, lty, lwd) box(...)
            localWindow <- function(..., col, bg, pch, cex, lty, lwd)
plot.window(...)
            localTitle <- function(..., col, bg, pch, cex, lty, lwd)
title(...)
            xlabel <- if (!missing(x))
                      deparse(substitute(x))
            ylabel <- if (!missing(y))
                      deparse(substitute(y))
            xy <- xy.coords(x, y, xlabel, ylabel, log)
            xlab <- if (is.null(xlab))
                      xy$xlab
            else xlab
            ylab <- if (is.null(ylab))
                      xy$ylab
            else ylab
            xlim <- if (is.null(xlim))
                      range(xy$x[is.finite(xy$x)])
            else if( length(xlim)==1 & names(xlim)=="min" ) {
              c(xlim,range(xy$x[is.finite(xy$x)])[2]) }
            else if( length(xlim)==1 & names(xlim)=="max" ) {
              c( range(xy$x[is.finite(xy$x)])[1], xlim) }        
        else xlim
        ylim <- if (is.null(ylim))
                      range(xy$y[is.finite(xy$y)])
            else if( length(ylim)==1 & names(ylim)=="min" ) {
              c( ylim,range(xy$y[is.finite(xy$y)])[2]) }
            else if( length(ylim)==1 & names(ylim)=="max" ) {
              c( range(xy$y[is.finite(xy$y)])[1], ylim) }        
            else ylim
            dev.hold()
            on.exit(dev.flush())
            plot.new()
            localWindow(xlim, ylim, log, asp, ...)
            panel.first
            plot.xy(xy, type, ...)
            panel.last
            if (axes) {
                      localAxis(if (is.null(y))
                                            xy$x
                                        else x, side = 1, ...)
                              localAxis(if (is.null(y))
                                                    x
                                                else y, side = 2, ...)
                    }
            if (frame.plot)
                      localBox(...)
            if (ann)
                      localTitle(main = main, sub = sub, xlab = xlab, ylab =
ylab,
                                             ...)
            invisible()
      }

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