Proposal for improved grid() [non-backward compatible]

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Subject: Proposal for improved grid() [non-backward compatible]
From: Martin Maechler (maechler@stat.math.ethz.ch)
Date: Mon 06 Sep 1999 - 18:47:10 EST


Message-Id: <199909060847.KAA01186@sophie.ethz.ch>

Not many of you will use grid() widely, probably.
Also, two months ago, Paul Murrell said on R-help (topic "grid command")

PM>> i think the abline() solution is the best for doing what grid() won't.
PM>> like you say, grid() is just a simple front-end to abline().

grid() *is* too simple to be of practical use.

I propose the following which is of some practical use,
since it uses much more useful defaults:

    grid <- function (nx=NULL, ny=NULL, col="lightgray", lty="dotted")
    {
        if (is.null(nx)|| nx >= 1) {
            axp <- par("xaxp")
            if(is.null(nx)) nx <- axp[3]
            abline(v = seq(axp[1],axp[2],len=1+nx), col = col, lty = lty)
        }
        if (is.null(ny)|| ny >= 1) {
            axp <- par("yaxp")
            if(is.null(ny)) ny <- axp[3]
            abline(h = seq(axp[1],axp[2],len=1+ny), col = col, lty = lty)
        }
    }

Try e.g.

plot(1:10, panel.first = grid(col="red"))
qqnorm(rnorm(100), panel.first=grid())
plot(1:10, panel.first=grid(ny=4))
plot(1:10, panel.first=grid(ny=0))

-----------

The only "problem": It's not backwards compatible.
Does anyone have a problem with that?

Martin Maechler <maechler@stat.math.ethz.ch> http://stat.ethz.ch/~maechler/
Seminar fuer Statistik, ETH-Zentrum LEO D10 Leonhardstr. 27
ETH (Federal Inst. Technology) 8092 Zurich SWITZERLAND
phone: x-41-1-632-3408 fax: ...-1228 <><
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