R help - Dec 2000 - Expression in plot text

I'd like to put a degree symbol in the title of a plot.  Something like:

plot(1,main=expression("Data at " * 45 * degree * " North"))

That works fine, but I like the 45 to be the value of a variable, instead of a
constant, an in:

lat <- 45
plot(1,main=expression("Data at " * lat * degree * "
North"))

But this doesn't work of course, the graph title is "Data at lat°
North".  If
I try to paste expressions and strings together, that doesn't work either.

Now, I can figure out how to stick an ASCII 176 character into a text file and
get an actual degree symbol inside a literal string that way, though it's
rather a pain, and it shows up as "45\260 North" in an xterm.  But
what if I
want some other kind of expression that I can't just type in as a string?

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On Wed, 6 Dec 2000, Trent Piepho wrote:
> I'd like to put a degree symbol in the title of a plot.  Something
like:
> 
> plot(1,main=expression("Data at " * 45 * degree * "
North"))
> 
> That works fine, but I like the 45 to be the value of a variable, instead
of a
> constant, an in:
> 
> lat <- 45
> plot(1,main=expression("Data at " * lat * degree * "
North"))
I think you'll find this in the FAQ. In any case.

lat<-45
plot(1,main=substitute("Data at "*lat*degree*"
North",list(lat=lat)))


	-thomas

Thomas Lumley
Assistant Professor, Biostatistics
University of Washington, Seattle

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As it happens I was also trying to do something similar and had a window
open with Brian's response to a similar question last August.  Here is it:


On Tue, 29 Aug 2000, Yudi Pawitan wrote:
> I'm putting a title over different plots, where 'that'
> varies. How do I make the value appear? Example:
>
> that <- 1
> plot(1:10)
> title(m

expression(paste(hat(theta),'= ',that)))

We've been here before. To get an expression either use parse on your
pasted character string or substitute on an expression.  There are worked
examples in the list achives. The neatest is

title(substitute(hat(theta) == that, list(that=that)))

(note it is == not =)





url:	http://www.econ.uiuc.edu		Roger Koenker	
email	roger at ysidro.econ.uiuc.edu		Department of Economics
vox: 	217-333-4558				University of Illinois
fax:   	217-244-6678				Champaign, IL 61820

On Wed, 6 Dec 2000, Trent Piepho wrote:
> I'd like to put a degree symbol in the title of a plot.  Something
like:
> 
> plot(1,main=expression("Data at " * 45 * degree * "
North"))
> 
> That works fine, but I like the 45 to be the value of a variable, instead
of a
> constant, an in:
> 
> lat <- 45
> plot(1,main=expression("Data at " * lat * degree * "
North"))
> 
> But this doesn't work of course, the graph title is "Data at lat°
North".  If
> I try to paste expressions and strings together, that doesn't work
either.
> 
> Now, I can figure out how to stick an ASCII 176 character into a text file
and
> get an actual degree symbol inside a literal string that way, though
it's
> rather a pain, and it shows up as "45\260 North" in an xterm. 
But what if I
> want some other kind of expression that I can't just type in as a
string?
> 
>
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> r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html
> Send "info", "help", or "[un]subscribe"
> (in the "body", not the subject !)  To: r-help-request at
stat.math.ethz.ch
>
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> 
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