Re: [R] Rotate values on Y axis

From: Marc Schwartz <MSchwartz_at_mn.rr.com>
Date: Fri 09 Jun 2006 - 23:27:37 EST

On Fri, 2006-06-09 at 14:13 +0100, d d sutcliffe@durham ac uk wrote:
> Hi,
>
> I have been working through one of the examples on the FAQ about
> rotating the labels on the x axis, I need to do the same but for the y
> axis. I have managed to change some of the code, but I am still not
> getting there, there is still something wrong. My syntax is as follows:
>
>
> > par(mar = c(5, 7, 4, 2) + 0.1)
> > plot(1 : 8, yaxt = "n", ylab = "")
> > axis(2, labels = FALSE)
> > labels <- paste("Label", 1:8, sep = " ")
> > text(1:8, par("usr")[3] - 0.25, srt = 45, adj = 1,
> + labels = labels, xpd = TRUE)
>
> If anybody knows what is wrong then I would appreciate your help...been
> working on this for far too long already!
>
> Regards,
>
> Dan

Dan,

You need to adjust two things:

  1. par("usr")[3] is the minimum value of the y axis. You would use this (as in the FAQ example) when you want to move the text vertically below the x axis. See ?par for more information.

In your case, you want to move the text to the left of the y axis. Thus you need to use par("usr")[1] instead, which is the minimum value of the x axis.

2. In the text call, you are setting the 'x' coordinate to 1:8, which is why the labels are appearing along the x axis, rather than along the y axis. So you want to set the y coordinate to 1:8 instead.

So, the adjusted sequence would be:

 par(mar = c(5, 7, 4, 2) + 0.1)
 plot(1 : 8, yaxt = "n", ylab = "")
 axis(2, labels = FALSE)
 labels <- paste("Label", 1:8, sep = " ")

 text(par("usr")[1] - 0.25, 1:8, srt = 45, adj = 1,

      labels = labels, xpd = TRUE)

HTH, Marc Schwartz



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