[R] how to print "<=" in plot title

[array chip]

Thank you David and Bert. 

x<-3plot(1:10)
title(bquote( x <= .(x) ))

would do what I want. But I also want the title printed in bold font. so I tried

x<-3
plot(1:10)
title(bquote(bold(x <= .(x)) ))

But this did not print the "less than equal to" symbol and the number 3 (from 
variable x) in bold. Anyway to solve that?

Thanks again!

John




----- Original Message ----
From: David Winsemius <dwinsemius at comcast.net>
To: Peter Ehlers <ehlers at ucalgary.ca>
Cc: array chip <arrayprofile at yahoo.com>; R <r-help at r-project.org>
Sent: Tue, June 28, 2011 11:04:07 AM
Subject: Re: [R] how to print "<=" in plot title


On Jun 28, 2011, at 1:52 PM, Peter Ehlers wrote:

> On 2011-06-28 10:25, array chip wrote:
>> Hi, how can I print "<=" (I mean the symbol of just one character) in the 
main
>> title of a plot?
>> 
>> for example:
>> 
>> plot(1:10, main=paste("x<=", x))
>> 
>> where variable x is some number generated on the fly.
> 
>  x <- 2.718
>  plot(0, 0)
>  title(bquote( x %<=% .(x) ))

I think John wants the mathematical symbol. As was pointed out in a question 
last week, the `<=` plotmath symbol needs to be flanked by operands. 
Non-printing operands can be created with the phantom function:

title(main=expression(phantom("")<=phantom("")) )

Contrary to Gunters's comment, this is probably going to work on all the three 
major OS platforms. It depends only on whether there is a Symbol font mapped to 
the output device.
> 
> ?plotmath

Yes. The details are there.

> 
> Peter Ehlers
> 


David Winsemius, MD
West Hartford, CT