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How to join two plotmath type expressions

6 messages · Pascal Oettli, S Ellison, arun +2 more

Trevor Carey-Smith
# 
If I have two variables set, one of which holds an expression, for example:

 > label <- 'Temperature'
 > unit <- expression(paste(degree,'C'))

how can I join them together for use in mtext (or equivalent)? The
following is conceptually what I want to do, but will obviously not work:

 > plot(0:1)
 > mtext(paste(label,unit))

Preferably, I would like this to work if one, both or neither of label
and unit are expressions.

Thanks,
Trevor.
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Pascal Oettli
# 
Hello,

Try this one:

 > mtext(expression(Temperature(degree*C)))

Hope this help

Regards,
Pascal

Le 12/08/15 12:56, Trevor Carey-Smith a ?crit :
S Ellison
# 
This seems to work:

plot(1:10, type='n')

label <- 'Temperature'
unit <- bquote(degree*C)
text(5,5,substitute(l~u, list(l=label, u=unit)))
 
S Ellison

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arun
# 
HI,
Try this:
plot(1:10, type='n')
?newtxt<-bquote(paste("Temperature", "(",degree*C,")",sep=""))
?mtext(newtxt,3)

A.K.



----- Original Message -----
From: Trevor Carey-Smith <trevor.carey-smith at niwa.co.nz>
To: r-help at r-project.org
Cc: 
Sent: Tuesday, August 14, 2012 11:56 PM
Subject: [R] How to join two plotmath type expressions

If I have two variables set, one of which holds an expression, for example:
how can I join them together for use in mtext (or equivalent)? The
following is conceptually what I want to do, but will obviously not work:
Preferably, I would like this to work if one, both or neither of label
and unit are expressions.

Thanks,
Trevor.
--
Please consider the environment before printing this email.
NIWA is the trading name of the National Institute of Water & Atmospheric Research Ltd.

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Trevor Carey-Smith
#
On 08/15/2012 10:45 PM, S Ellison wrote:
Thanks, that's exactly what I was after.
Regards,
Trevor.
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Please consider the environment before printing this email.
NIWA is the trading name of the National Institute of Water & Atmospheric Research Ltd.
1 day later
Peter Dalgaard
#
On Aug 15, 2012, at 23:17 , Trevor Carey-Smith wrote:

            

      
      
      
    

        
A curious application of bquote though. How about using it where it matters?

plot(5, 4)
label <- 'Temperature'
unit <- quote(degree*C)
text(5, 5, bquote(.(label) ~ .(unit)))