I have an instance where I need to include Greek letters on a plot title that 
is multiple lines. 
 
I've searched the forums for an approach to do this, but most of the previous 
posts and replies seem to just address instances of single line examples and 
problems:, e.g. 
 
https://stat.ethz.ch/pipermail/r-help/1999-October/005096.html
 
I tried implementing those suggestions, e.g. "expression(paste(...))", but that 
seemed to remove all the line split formating, i.e. "\n".
 
In the example code below I would like the sigma to be the lower case Greek 
symbol for sigma.  Actually I would like the x and y to be subscripts of the 
lower case Greek symbol, but I suppose that is the next step.  I guess the key 
is that I would like to maintain the multiple line title while having the Greek 
letters.  
 
Thanks again for any feedback. and insights.
 
 
 
number_vals<-100
x<-rnorm(number_vals)
y<-rnorm(number_vals)
plot(1, 1,
     xlim= c(min(x), max(x)),
     ylim= c(min(y), max(y)), col=0)
points(x, y)
the_expression<-paste("Plotting y vs. x", 
                      "\n sigma x = ", format(sd(x), digits=4, scientific=F), 
                      "\n sigma y = ", format(sd(y), digits=4, scientific=F),  
sep="")
                      
title(the_expression)
grid()
 
 
 
Oh yeah...
> sessionInfo(package=NULL)
R version 2.9.2 (2009-08-24) 
i386-pc-mingw32 




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