'at' parameter in mtext(.., adj=0, outer=T) (PR#396)
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
--please do not edit the information below-- Version: platform = Windows arch = x86 os = Win32 system = x86, Win32 status = major = 0 minor = 90.1 year = 1999 month = December day = 15 language = R Windows 9x 4.0 (build 1111) B Search Path: .GlobalEnv, Autoloads, package:base John Maindonald email : john.maindonald@anu.edu.au Statistical Consulting Unit, phone : (6249)3998 c/o CMA, SMS, fax : (6249)5549 John Dedman Mathematical Sciences Building Australian National University Canberra ACT 0200 Australia -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-devel mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-devel-request@stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._
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) 1 South Parks Road, +44 1865 272860 (secr) Oxford OX1 3TG, UK Fax: +44 1865 272595 -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-devel mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-devel-request@stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._