[Rd] plot(x) in 2.7.0 (with y=NULL) proposed code correction

[Sklyar, Oleg (MI London)]

Hi all:

following the previous discussion, it looks like plot(x) with y=NULL
still does not work correctly. If one tries for example plot(1:5) it
works, but already for plot(runif(100)) it does not. I posted the
proposed correction for plot.POSIXct and plot.POSIXlt before. Please
voice your opinions whether the following fix for plot.default could be
reasonable? I include the full function and the diff.

Thanks,
Oleg

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, ...)
{
    ## These col, bg, pch, cex can be vectors, so exclude them
    ## Also, axis and box accept some of these
    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(...)
    if (!is.null(y)) {
        ## normal plot x against y 
        xlabel <- if (!missing(x)) deparse(substitute(x))
        ylabel <- 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
xlim
        ylim <- if (is.null(ylim)) range(xy$y[is.finite(xy$y)]) else
ylim
                
    } else {
        ## plot x on the vertical axis against index
        ## exchange given x* and y* attributes. One actually needs to
        ## exchange other attributes like xaxt/yaxt etc, but the same
flaw
        ## is in the original implementation
        xlabel <- "Index"
        ylabel <- if (!missing(x)) deparse(substitute(x))
        xy <- xy.coords(seq_along(x), x, "Index", ylabel, log)
        # if (!is.null(ylab)) warning("y is NULL, ylab will be ignored")
        ylab <- if (is.null(xlab)) xy$ylab else xlab
        xlab <- "Index"
        # if (!is.null(ylim)) warning("y is NULL, ylim is ignored")
        ylim <- if (is.null(xlim)) range(xy$y[is.finite(xy$y)]) else
xlim
        xlim <- range(xy$x[is.finite(xy$x)])
    }
    plot.new()
    localWindow(xlim, ylim, log, asp, ...)
    panel.first # eval() is wrong here {Ross I.}
    plot.xy(xy, type, ...)
    panel.last
    if (axes) {
    	localAxis(if(is.null(y)) xy$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()
}

=================== diff
=====================================================
57,81c57,63
<     if (!is.null(y)) {
<         ## normal plot x against y
<         xlabel <- if (!missing(x)) deparse(substitute(x))
<         ylabel <- 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
xlim
<         ylim <- if (is.null(ylim)) range(xy$y[is.finite(xy$y)]) else
ylim
<
<     } else {
<         ## plot x on the vertical axis against index
<         ## exchange given x* and y* attributes. One actually needs to
<         ## exchange other attributes like xaxt/yaxt etc, but the same
flaw
<         ## is in the original implementation
<         xlabel <- "Index"
<         ylabel <- if (!missing(x)) deparse(substitute(x))
<         xy <- xy.coords(seq_along(x), x, "Index", ylabel, log)
<         # if (!is.null(ylab)) warning("y is NULL, ylab will be
ignored")
<         ylab <- if (is.null(xlab)) xy$ylab else xlab
<         xlab <- "Index"
<         # if (!is.null(ylim)) warning("y is NULL, ylim is ignored")
<         ylim <- if (is.null(xlim)) range(xy$y[is.finite(xy$y)]) else
xlim
<         xlim <- range(xy$x[is.finite(xy$x)])
<     }
---
>     xlabel <- if (!missing(x)) deparse(substitute(x))
>     ylabel <- if (!missing(y)) deparse(substitute(y))
>     xy <- xy.coords(x, y, xlabel, ylabel, log)
>     xlab <- if (is.null(xlab)) xy$xlab else xlab
>     ylab <- if (is.null(ylab)) xy$ylab else ylab
>     xlim <- if (is.null(xlim)) range(xy$x[is.finite(xy$x)]) else xlim
>     ylim <- if (is.null(ylim)) range(xy$y[is.finite(xy$y)]) else ylim
88,89c70,71
<       localAxis(if(is.null(y)) xy$x else x, side = 1, ...)
<       localAxis(if(is.null(y))  x   else y, side = 2, ...)
---
>       localAxis(xy$x, side = 1, ...)
>       localAxis(xy$y, side = 2, ...)


Dr Oleg Sklyar
Technology Group
Man Investments Ltd
+44 (0)20 7144 3803
osklyar at maninvestments.com


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