See
Ligges, U. (2002): R Help Desk: Automation of Mathematical Annotation in
Plots. R News 2 (3), 32-34.
http://www.r-project.org/doc/Rnews/Rnews_2002-3.pdf
Uwe Ligges
Koen wrote:
Hello,
I am trying to include legend text with math symbols from a predefined
character variable that is read in from a file.
If there is only one line of text in the legend, the following, although
cumbersome, works for me:
> LegendText = " 'U' [infinity], '=10 m/s' " # (read in from a file)
> LegendName = paste("bquote(paste(",LegendText, "))")
> plot( c(1,2,3), c(1,2,3) )
> legend(‘topleft’,1, eval(parse(text=LegendName)) )
If I now have more than one line in a plot and hence want to include more
than one line of legendtext, I run into problems because
> legend(‘topleft’,1, c(
eval(parse(text=LegendName1)),eval(parse(text=LegendName2)) )
will not result in evaluation of the character string but just a paste of
the string and
> legend(‘topleft’,1, eval(parse(text=c(LegendName1, LegendName2))) )
will only evaluate the first element of the array.
Am I trying to do the impossible or is my approach totally wrong? Any help
would be greatly appreciated!
Koen
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