[R] Using expression for Italics and object evaluation in plot title

[Gabor Grothendieck]

The expression in plotmath must be valid R syntax.

plot(1)
p.val <- .1
 title(sub=bquote(Log ~ rank ~ test ~ (italic(p)-value == .(p.val))))


On 10/10/07, Daniel Brewer <daniel.brewer at icr.ac.uk> wrote:
> Thanks.  That works great if I do this:
> title(sub=bquote(italic(p)-value == .(p.val)))
>
> But if I add text to the beginning e.g.
> title(sub=bquote(Log rank test italic(p)-value == .(p.val)))
> I get an error message saying,
> Error: syntax error, unexpected SYMBOL, expecting ',' in
> "title(sub=bquote(Log rank"
>
> Dan
>
> Gabor Grothendieck wrote:
> > Try bquote as in:
> >
> > http://tolstoy.newcastle.edu.au/R/e2/help/07/09/26353.html
> >
> > On 10/10/07, Daniel Brewer <daniel.brewer at icr.ac.uk> wrote:
> >> Hi,
> >>
> >> I am trying to get a title on a plot that contains both some formatting
> >> and prints the value of an object.  What I have been using to get the
> >> italics is:
> >>
> >> title(sub=expression(paste("Log-rank test ",italic("p"),"-value = ",p.val)))
> >>
> >> But this prints "p.val" rather than the object value.  I have tried
> >> various combinations of paste and expression but it seems that to get
> >> the italic expression function has to be called first.
> >>
> >> Any ideas on how to get round this problem?
> >>
> >> Thanks
> >>
> >> Dan
> --
> **************************************************************
> Daniel Brewer, Ph.D.
> Institute of Cancer Research
> Email: daniel.brewer at icr.ac.uk
> **************************************************************
>
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