[R] changing coordinates?
siim at obs.ee
Tue Oct 29 08:09:41 CET 2002
On Mon, 28 Oct 2002, Richard Mueller wrote:
|I just detected R and have, after browsing the manual, one question:
|I look for quite a lot of time for graphical software which allows to
|plot data from a table or external file _with the axes of the coordinate
|system changed_, i.e. the x-axis should run from top left to bottom
|left, and the y-axis from top-left to top-right. It is of no use to
|interchange the rows in the table, the coordinate system should rely of
|that definition. This type of plot is used in limnological and
|oceanological graphs. Until now I could find no software which can do
|that job. Perhaps one of you can answer this beginner's question with a
|simple yes or no?
|Thank you, Richard
Short answer is yes, you can do it.
There is no pre-programmed plot command in order to do that, however. You
have to transform you data a bit, e.g. changing the sign. Suppose you have
> x <- c(1,2,3,-1)
> y <- 1:4
In that case you can do something like
> plot(y, -x, yaxt="n", xaxt="n")
> axis(2, at=pretty(-x), labels=as.character(-pretty(-x)))
Perhaps you get an idea.
otoomet at econ.au.dk
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