'at' parameter in mtext(.., adj=0, outer=T) (PR#396)
Prof Brian D Ripley
ripley@stats.ox.ac.uk
Sat, 15 Jan 2000 18:46:44 +0000 (GMT)
On Mon, 10 Jan 2000 john.maindonald@anu.edu.au wrote:
> Depending on the setting of par()$usr,
> the 'at' setting in mtext(.., adj=0, outer=T) may cause the
> text to appear in an anomalous position (e. g. in the first
> instance below, at the left of the plot region rather than
> at 'at=0' in the figure region), or the text may not appear
> at all.
>
> If one does not set the 'at' parameter the text appears
> (with 'adj=0') on the far left of the plot region. I assume
> this is also anomalous; at all events it is the behaviour
> that I wished to circumvent.
I am afraid this is documentation confusion. There are no user
coordinates in the outer margins, and at works like adj if outer=TRUE.
Indeed the example
mtext(side=1,line=0.5,"Outer text",outer=T, adj=0)
does work correctly for me: specifying adj=0 means put it at the extreme
left, adj=1 at the extreme right, and adj=0 to centre it (on the
display region, not the figure region).
I will re-write the documentation.
>
> The function plot.test() demonstrates the behaviour:
>
> plot.test <-
> function(xval=0:4, pos=NULL){
> oldpar<-par(oma=c(2,0,0,0))
> on.exit(par(oldpar))
> plot(xval,xval)
> if(is.null(pos))pos<-min(xval)
> print(pos)
> print(par()$usr)
> mtext(side=1,line=3.5,"Marginal text",adj=0,at=pos)
> mtext(side=1,line=0.5,"Outer text",outer=T, adj=0,at=min(xval))
> }
>
> > plot.test(xval=0:4) # "Outer text appears on left of the figure region
> [1] 0
> [1] -0.16 4.16 -0.16 4.16
> > plot.test(xval=20:24) # "Outer text does not appear at all
> [1] 20
> [1] 19.84 24.16 19.84 24.16
> > # Check that at=0 does not work
> > plot.test(xval=20:24, pos=0) # "Outer text does not appear at all
> [1] 0
> [1] 19.84 24.16 19.84 24.16
> >
>
>
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> os = Win32
> system = x86, Win32
> status =
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> minor = 90.1
> year = 1999
> month = December
> day = 15
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>
> Windows 9x 4.0 (build 1111) B
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> John Maindonald email : john.maindonald@anu.edu.au
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--
Brian D. Ripley, ripley@stats.ox.ac.uk
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
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