From: Martin Maechler <maechler_at_stat.math.ethz.ch>

Date: Fri 30 Dec 2005 - 08:06:42 EST

ss <- lapply(seq(along = at),

}

R-help@stat.math.ethz.ch mailing list

https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Fri Dec 30 08:13:17 2005

Date: Fri 30 Dec 2005 - 08:06:42 EST

>>>>> "Marc" == Marc Schwartz (via MN) <mschwartz@mn.rr.com> >>>>> on Wed, 28 Dec 2005 15:46:37 -0600 writes:

Marc> On Wed, 2005-12-28 at 20:15 +0000,
Marc> R.C.GILL@soton.ac.uk wrote:

>> Dear All,

* >>
** >> Apologies for this simple question and thanks in advance
** >> for any help given.
** >>
** >> Suppose I wanted to plot 1 million observations and
** >> produce the command
** >>
** >> plot(rnorm(1000000))
** >>
** >> The labels of the xaxis are 0, e+00 2 e+05 etc. These are
** >> clearly not very attractive (The plots are for a
** >> PhD. thesis).
** >>
** >> I would like the axes to be 0,2,4,6,8,10 with a *10^5 on
** >> the right hand side.
** >>
** >> Is there a simple command for this?
** >>
** >> Best Wishes
** >>
** >> Roger
*

Marc> See ?plotmath for some additional examples and there Marc> are some others in the list archives.

Yes, I think this one is there too:

It has the "* 10^k" after each number;

the nice thing about it is that it works for all kind of data
-- and of course, in principle it could be built into R ...

###----------------- Do "a 10^k" labeling instead of "a e<k>" --- axTexpr <- function(side, at = axTicks(side, axp=axp, usr=usr, log=log), axp = NULL, usr = NULL, log = NULL){

## Purpose: Do "a 10^k" labeling instead of "a e<k>" ## this auxiliary should return 'at' and 'label' (expression) ## ---------------------------------------------------------------------- ## Arguments: as for axTicks() ## ---------------------------------------------------------------------- ## Author: Martin Maechler, Date: 7 May 2004, 18:01 eT <- floor(log10(abs(at)))# at == 0 case is dealt with belowmT <- at / 10^eT

ss <- lapply(seq(along = at),

function(i) if(at[i] == 0) quote(0) else substitute(A %*% 10^E, list(A=mT[i], E=eT[i])))do.call("expression", ss)

}

x <- 1e7*(-10:50)

y <- dnorm(x, m=10e7, s=20e7)

plot(x,y) ## ^^^^^^ not so nice; ok, try

par(mar=.1+c(5,5,4,1))## << For the horizontal y-axis labels, need more space
plot(x,y, axes= FALSE, frame=TRUE)

aX <- axTicks(1); axis(1, at=aX, label= axTexpr(1, aX))
if(FALSE) # rather the next one

{ aY <- axTicks(2); axis(2, at=aY, label= axTexpr(2, aY))}
## or rather (horizontal labels on y-axis):
aY <- axTicks(2); axis(2, at=aY, label= axTexpr(2, aY), las=2)

R-help@stat.math.ethz.ch mailing list

https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Fri Dec 30 08:13:17 2005

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