R help - Jan 2010 - Greek letters on a multi-line plot title

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

Jason Rupert wrote:
> 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()
> 
When confronted with this problem, after many failed attempts, I have 
had to resort to mtext.

David Scott


-- 
_________________________________________________________________
David Scott	Department of Statistics
		The University of Auckland, PB 92019
		Auckland 1142,    NEW ZEALAND
Phone: +64 9 923 5055, or +64 9 373 7599 ext 85055
Email:	d.scott at auckland.ac.nz,  Fax: +64 9 373 7018

Director of Consulting, Department of Statistics