[R] using subscripts in a plot title with 2 lines

Paul Murrell p.murrell at auckland.ac.nz
Tue Apr 20 04:24:03 CEST 2004


Liaw, Andy wrote:
> If I understood your problem correctly, one ugly way of getting around this
> is to use call mtext() twice to put the two lines in the title area, using
> the line argument to mtext to control the location of the lines.  E.g.,
> something like:
> plot(1, main="")
> mtext(expression(IC[50]), line=3, side=3, cex=1.2)
> mtext("of My Data", line=1.5, side=3, cex=1.2)

An alternative that keeps everything as one expression is to use atop() 
within the expression rather than the '\n'.  For example:

plot(1, main="")
mtext(expression(paste(atop(paste('Plot of Observed vs. Predicted 
-log(', IC[50], ') Values for the PDGFR'),'Dataset'))), side=3, line=1.5)

But this may still look too ugly :)

In general, '\n' will not be handled very well within mathematical 


>>From: Rajarshi Guha
>>  I'm making a plot in which the title takes up two lines. The title
>>contains a subscript but when I look at the plot it does'nt 
>>seem tocome
>>out properly. The code I'm using is:
>>   xtxt = expression(paste('Observed -log( ', IC[50], ' )'))
>>   ytxt = expression(paste('Predicted -log( ', IC[50], ' )'))
>>   mtxt = expression(paste('Plot of Observed vs. Predicted -log(',
>>IC[50], ') Values for the PDGFR\nDataset'))
>>   plot(tset$V2, tset$V3, xlim = c(-2,2), ylim = c(-2,2),
>>    pch = 19, col = "blue", 
>>    main=mtxt,
>>    xlab = xtxt,
>>    ylab = ytxt)
>>Removing the IC[50] term makes it come out OK. 
>>Is there any way to get around this?
>>Rajarshi Guha <rxg218 at psu.edu> <http://jijo.cjb.net>
>>GPG Fingerprint: 0CCA 8EE2 2EEB 25E2 AB04 06F7 1BB9 E634 9B87 56EE
>>Does Ramanujan know Polish?
>>-- E.B. Ross
>>R-help at stat.math.ethz.ch mailing list
>>PLEASE do read the posting guide! 
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Dr Paul Murrell
Department of Statistics
The University of Auckland
Private Bag 92019
New Zealand
64 9 3737599 x85392
paul at stat.auckland.ac.nz

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