R help - Dec 2000 - Reversing x-axis

Dear all,

I'm making a system to create a star-chart, and I have encountered one of
the intuitive and clearly thoughtful conventions that are so common in
astronomy :-J... Well, the point being, I have to reverse the x-axis.
I figured, I might just set xlim=rev(range(x)). Do e.g.
> x <- 0:5
> y <- (0:5)^3
> plot(x, y)
> plot(x, y, xlim=rev(range(x)))
The problem is that here (R-1.1.1.1, osf4.0e), the numbers on the axis
doesn't come out right when I do this. Only the last tick mark has a
number, namely min(x). Is this a bug or a feature?

Anybody have a good workaround? I've tried (for this example)
axis(1, rev(x), rev(x))

Best,

Kjetil
-- 
Kjetil Kjernsmo
Graduate astronomy-student                    Problems worthy of attack
University of Oslo, Norway            Prove their worth by hitting back
E-mail: kjetikj at astro.uio.no                                - Piet Hein
Homepage <URL:http://www.astro.uio.no/~kjetikj/>
Webmaster at skepsis.no

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http://www.ens.gu.edu.au/robertk/R/devel/00b/0206.html
http://www.ens.gu.edu.au/robertk/R/devel/00a/0419.html

  At this time, you have to do something like

x <- rnorm(100)
y <- rnorm(100)
plot(max(x)-x,max(y)-y,axes=FALSE)
xlabvals <- pretty(x,5)
ylabvals <- pretty(y,5)
axis(side=1,at=max(x)-xlabvals,labels=xlabvals)
axis(side=2,at=max(y)-ylabvals,labels=ylabvals)

  I think it's time to put this one in the FAQ ... (although, again, I
don't know if I would have found it just searching the archives if I
hadn't remembered that it was there in the first place).


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318 Carr Hall                                bolker at zoo.ufl.edu
Zoology Department, University of Florida    http://www.zoo.ufl.edu/bolker
Box 118525                                   (ph)  352-392-5697
Gainesville, FL 32611-8525                   (fax) 352-392-3704


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