# Re: R-beta: par --- how to do custom axes

Martin Maechler (maechler@stat.math.ethz.ch)
Wed, 13 May 1998 12:04:54 +0200

```Date: Wed, 13 May 1998 12:04:54 +0200
Message-Id: <199805131004.MAA10333@sophie.ethz.ch>
From: Martin Maechler <maechler@stat.math.ethz.ch>
To: moro@percol.ethz.ch
Subject: Re: R-beta: par --- how to do custom axes

Some of your problems should be gone

0.61.2 und xx.3 have explicitly been  Bug-fix releases
``that everybody should install'' (:-)   --- of course, not really)

>> 2. In a log="x" plot, labels are drawn in exp.mode: 1e-02, 1e-01,..
>>    How can I change it to 0.01, 0.1, ... ?

You can work with
axes = FALSE
and later explicit

axis(1, at = ..., labels= ...)
axis(2, at = ..., labels= ...)

Here is an example ((which also exhibits a long standing bug for pch="."
AND a bug in 0.62 [no ticks !!]))

##--- Log-Log Plot  with  custom axes
lx <- seq(1,5, length=41)
yl <- expression(e^{-frac(1,2) * {log[10](x)}^2})
y <- exp(-.5*lx^2)
op <- par(mfrow=c(2,1), mar=par("mar")+c(0,1,0,0))

plot(10^lx, y, log="xy", type="l", col="purple",
main="Log-Log plot", ylab=yl, xlab="x")

plot(10^lx, y, log="xy", type="o", pch='.', col="forestgreen",
main="Log-Log plot with custom axes", ylab=yl, xlab="x",
axes = FALSE, frame.plot = TRUE)

axis(1, at = my.at <- 10^(1:5), labels = formatC(my.at))
at.y <- 10^(-5:-1)
axis(2, at = at.y, labels = formatC(at.y))
par(op)
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```