[R] math symbols and text with mtext()

[Peter Dalgaard]

Juan Lewinger <lewinger at usc.edu> writes:

> Dear R users,
> 
> Two questions:
> 
> 1) Is there a way to simplify the mtext() line below ?
> 
> beta=c(1,-1)
> m=5
> plot(1)
> mtext( bquote(paste( beta == .(paste( "(", paste(beta, collapse=", "), ")" )) )), outer=TRUE,line=-3)
> 

The outer paste() is superfluous, but apart from that: Not really.
You're specifying a nonstandard formatting of beta, "(1, -1)" so you
also need to give all details. If you can live with a slightly
different format, try

mtext( bquote(beta == .(deparse(beta) ) ), outer=TRUE,line=-3)

and in fact,  

mtext(bquote( beta == .(substring(deparse(beta), 2)) ), outer=TRUE,line=-3)

will strip off the leading "c" and give you what you want, but only
slightly less cryptically.


> 2) How do I get the embedded carriage return "\n" below to work, i.e for the text that follows it to appear on the next line?
> 
> beta=c(1,-1)
> m=5
> plot(1)
> mtext( bquote(paste( beta == .(paste( "(", paste(beta, collapse=", "), ") " )), 
>                          "\n Expected # of true positives = ", .(m))), outer=TRUE, line=-3)
> 
> Thanks in advance! 
> 
> Juan Pablo Lewinger, Ph.D. 
> Department of Preventive Medicine 
> Keck School of Medicine 
> University of Southern California
> 
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> 

-- 
   O__  ---- Peter Dalgaard             Øster Farimagsgade 5, Entr.B
  c/ /'_ --- Dept. of Biostatistics     PO Box 2099, 1014 Cph. K
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