R help - Nov 2009 - how to display a string containing greek chrs and variables

I'm trying something that I thought would be pretty simple, but it's  
proving quite frustrating...

I want to display, for instance, the correlation coefficient "rho" in
a graph.

I can do something like:

text(x, y, paste("rho =", cor))

where cor would be my previously calculated correlation coefficient,  
and x and y the coordinates.
Obviously that displays "rho", not the greek letter rho.

I can do also this:

text(x, y, paste("\\*r =",cor), vfont = c("sans
serif","bold"))

that works, but that doesn't look very "pretty".
What looks good is doing something like:

text(x, y, expression(rho))

But I haven't managed to make it do what I need.

I can get this:
text(x, y, expression(rho == 0.8))

that looks good, but how can I substitute the "0.8" for teh name of a
numeric variable whose value is 0.8?

I'm going slightly mad... it can't be that hard.

Thanks for any help!

Jose


-- 
Dr. Jose I. de las Heras                      Email: J.delasHeras at ed.ac.uk
The Wellcome Trust Centre for Cell Biology    Phone: +44 (0)131 6513374
Institute for Cell & Molecular Biology        Fax:   +44 (0)131 6507360
Swann Building, Mayfield Road
University of Edinburgh
Edinburgh EH9 3JR
UK
*********************************************
NEW EMAIL from July'09: nach.mcnach at gmail.com
*********************************************

-- 
The University of Edinburgh is a charitable body, registered in
Scotland, with registration number SC005336.

Hi,

try this,

plot.new()
x=0.8
text(0.5, 0.5, bquote(rho == .(x)))


HTH,

baptiste
2009/11/3  <J.delasHeras at ed.ac.uk>:
>
> I'm trying something that I thought would be pretty simple, but
it's proving
> quite frustrating...
>
> I want to display, for instance, the correlation coefficient
"rho" in a
> graph.
>
> I can do something like:
>
> text(x, y, paste("rho =", cor))
>
> where cor would be my previously calculated correlation coefficient, and x
> and y the coordinates.
> Obviously that displays "rho", not the greek letter rho.
>
> I can do also this:
>
> text(x, y, paste("\\*r =",cor), vfont = c("sans
serif","bold"))
>
> that works, but that doesn't look very "pretty".
> What looks good is doing something like:
>
> text(x, y, expression(rho))
>
> But I haven't managed to make it do what I need.
>
> I can get this:
> text(x, y, expression(rho == 0.8))
>
> that looks good, but how can I substitute the "0.8" for teh name
of a
> numeric variable whose value is 0.8?
>
> I'm going slightly mad... it can't be that hard.
>
> Thanks for any help!
>
> Jose
>
>
> --
> Dr. Jose I. de las Heras ? ? ? ? ? ? ? ? ? ? ?Email: J.delasHeras at
ed.ac.uk
> The Wellcome Trust Centre for Cell Biology ? ?Phone: +44 (0)131 6513374
> Institute for Cell & Molecular Biology ? ? ? ?Fax: ? +44 (0)131 6507360
> Swann Building, Mayfield Road
> University of Edinburgh
> Edinburgh EH9 3JR
> UK
> *********************************************
> NEW EMAIL from July'09: nach.mcnach at gmail.com
> *********************************************
>
> --
> The University of Edinburgh is a charitable body, registered in
> Scotland, with registration number SC005336.
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>

Quoting baptiste auguie <baptiste.auguie at googlemail.com>:
> Hi,
>
> try this,
>
> plot.new()
> x=0.8
> text(0.5, 0.5, bquote(rho == .(x)))
>
>
> HTH,
>
> baptiste

Aha!

That does exactly what i wanted! Thanks!

Jose

-- 
The University of Edinburgh is a charitable body, registered in
Scotland, with registration number SC005336.