plotmath help with expression

2 messages · stephen sefick, Patrick Connolly

Wed, Sep 3, 2008 11:18 AM #

reg.line <- function(y, x, title)
{plot(y~x, main=title, xlab="TSS", ylab="Aluminum")
line <- lm(y~x)
d <- summary(line)
legend("topleft", legend=paste(expression(r^2), "=" ,d$r.squared,
sep=" "), bty="n")
abline(line)}

reg.line(1:10, 10:1, "line")

how do I get the legend to print the plotmath symbol expression(r^2)   ?

Stephen Sefick
Research Scientist
Southeastern Natural Sciences Academy

Let's not spend our time and resources thinking about things that are
so little or so large that all they really do for us is puff us up and
make us feel like gods. We are mammals, and have not exhausted the
annoying little problems of being mammals.

	-K. Mullis

Patrick Connolly

Wed, Sep 3, 2008 1:13 PM #

On Wed, 03-Sep-2008 at 02:18PM -0400, stephen sefick wrote:

|> reg.line <- function(y, x, title)
|> {plot(y~x, main=title, xlab="TSS", ylab="Aluminum")
|> line <- lm(y~x)
|> d <- summary(line)
|> legend("topleft", legend=paste(expression(r^2), "=" ,d$r.squared,
|> sep=" "), bty="n")
|> abline(line)}
|> 
|> reg.line(1:10, 10:1, "line")
|> 
|> how do I get the legend to print the plotmath symbol expression(r^2)   ?

I think you want your 'paste' part to look something like this:

legend = substitute(r^2 == rsq, list(rsq = d$r.squared))


It's quite a different approach from what is used with paste.

HTH

~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.   
   ___    Patrick Connolly   
 {~._.~}          		 Great minds discuss ideas    
 _( Y )_  	  	        Middle minds discuss events 
(:_~*~_:) 	       		 Small minds discuss people  
 (_)-(_)  	                           ..... Anon
	  
~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.~.