[R] parameter las (function par / graphics) on right axis

[Uwe Ligges]

Paulo Barata wrote:
> Dear R users,
> 
> When trying to produce a graph with a scale on the right axis,
> I came across a possible problem with graph making in R.
> 
> When using plot or barplot, when the parameter las (used
> by the graphics function par) is set to 1 (axis labels always
> horizontal), labels on the right axis are cropped when they
> have more than two digits. It seems that the graphics window
> does not allow for the extra space needed when scale labels
> are horizontal and have more than two digits. Resizing the
> graphics window does not make the graphs to show correctly.
> 
> Should outer regions of the graph, or figure regions, or figure
> margins be somehow redefined when las = 1?


Yes, you can specify margins with par("las" = ....). See ?par for details.

Example:
  y <- c(100,100,100,150,150,150,150)
  par(mar = c(1,1,1,4) + 0.1)
  barplot(y, ylim=c(0,200), axes=FALSE)
  box()
  axis(side=4,las=1)


Uwe Ligges



> I use R 2.3.1, running under Windows XP. My monitor is a Samsung
> SyncMaster 794MB+, resolution is 1024 x 768 pixels. (The problem
> also occurs at the lower resolution 800 x 600 pixels).
> 
> Some simple examples - barplot:
> 
> # right scale shows correctly, labels are vertical
> y <- c(100,100,100,150,150,150,150)
> barplot(y, ylim=c(0,200), axes=FALSE)
> box()
> axis(side=4)
> 
> # the rightmost digit of (horizontal) scale labels is cropped
> y <- c(100,100,100,150,150,150,150)
> barplot(y, ylim=c(0,200), axes=FALSE)
> box()
> axis(side=4,las=1)
> 
> Some simple examples - plot:
> 
> # right scale shows correctly, labels are vertical
> x <- runif(25,0,2000)
> y <- runif(25,0,2000)
> plot(x,y,axes=FALSE)
> box()
> axis(side=4)
> 
> # the two rightmost digits of (horizontal) scale labels are cropped
> x <- runif(25,0,2000)
> y <- runif(25,0,2000)
> plot(x,y,axes=FALSE)
> box()
> axis(side=4,las=1)
> 
> Regards,
> 
> Paulo Barata
> 
> -------------------------------------------------------------------
> Paulo Barata
> Fundacao Oswaldo Cruz
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> E-mail: pbarata at infolink.com.br
> 
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