[19198] in s-news-athena
[S] Summary: plot two 'y' variables vs. x, with different scales
daemon@ATHENA.MIT.EDU (David Parkhurst)
Sun Sep 12 23:58:53 1999
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From: "David Parkhurst" <parkhurs@ophelia.ucs.indiana.edu>
To: "s-news" <s-news@wubios.wustl.edu>
Date: Sun, 12 Sep 1999 22:51:47 -0500
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Recently I asked how to create a plot of two y vectors against one x
vector, when the y's had substantially different ranges. I wanted one
y axis on the left, and another on the right with different scales.
About ten minutes later, I had an answer from Bill Venables, up there
in Australia. I've had other replies since---thank you, all---but none
so direct or succinct as his, which was:
It's pretty straightforward, in fact. Here's one way
> ## (open the graphics device, if necessary)
> x <- 1:10; y1 <- 1:10; y2 <- (10:1)*10
> plot(x, y1, type = "l")
> par(new = T) ## fool it into thinking it has a blank screen
> plot(x, y2, type = "l", axes = F, xlab = "", ylab = "")
> axis(4)
That should do it.
That does do it---thank you. (But if you have to "fool it," is the
solution really "straightforward" <g>?)
Dave Parkhurst
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