R help - Mar 2010 - expression over-plotted

When I try to add the following annotation to a plot the entries are plotted
   one on top of the other.  I'm trying to get something that looks like
" eta
   =  0.2  "  where the Greek letter is used on the plot.  I realize that
   expression( eta == 0.2) is one solution, but ultimately I'd like to use
this
   in a legend that uses a loop to fill the entries so I don't want the 0.2
   entered manually.
   val <- 0.2
   plot( c(0,1), c(0,1) )
   text(  0.5, 0.5, c( expression( eta ), paste( ' = ', val ) ) )
   Thanks,
   Brad

On Fri, Mar 26, 2010 at 16:05, Brad Eck <brad.eck at mail.utexas.edu>
wrote:
>
> ? When I try to add the following annotation to a plot the entries are
plotted
> ? one on top of the other. ?I'm trying to get something that looks like
" eta
> ? = ?0.2 ?" ?where the Greek letter is used on the plot. ?I realize
that
> ? expression( eta == 0.2) is one solution, but ultimately I'd like to
use this
> ? in a legend that uses a loop to fill the entries so I don't want the
0.2
> ? entered manually.
> ? val <- 0.2
> ? plot( c(0,1), c(0,1) )
> ? text( ?0.5, 0.5, c( expression( eta ), paste( ' = ', val ) ) )
> ? Thanks,
> ? Brad
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>

Your text is a vector of length 2 and you are plotting each element
over the same x,y coordinates, hence the overlap.  You could either
add a second x-coordinate to spread things out:

text(  c(0.5,0.55), 0.5, c( expression( eta ), paste( ' = ', val ) ) )

or use bquote:

text(  0.5, 0.5, bquote(eta == .(val) ) )

Hope that helps