R help - Mar 2011 - Greek character and R

Dear R users.

In a loop, I set the title of my graph with :

	mytitle = expression(paste(delta^13,'C Station ', i)
	title(mytitle)

However, instead of using value of i, it will literally use "i"
character.

Any one know the way to concatenate the value of i to the mathematical
expression?

With regards,
Phil



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mytitle = parse(text=paste("expression(paste(delta^13,'C Station
',",i,"))"))
title(mytitle)

-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org]
On Behalf Of Filoche
Sent: Thursday, March 03, 2011 8:16 AM
To: r-help at r-project.org
Subject: [R] Greek character and R

Dear R users.

In a loop, I set the title of my graph with :

        mytitle = expression(paste(delta^13,'C Station ', i)
        title(mytitle)

However, instead of using value of i, it will literally use "i"
character.

Any one know the way to concatenate the value of i to the mathematical
expression?

With regards,
Phil



--
View this message in context:
http://r.789695.n4.nabble.com/Greek-character-and-R-tp3333304p3333304.html
Sent from the R help mailing list archive at Nabble.com.

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On 11-03-03 8:15 AM, Filoche wrote:
> Dear R users.
>
> In a loop, I set the title of my graph with :
>
> 	mytitle = expression(paste(delta^13,'C Station ', i)
> 	title(mytitle)
>
> However, instead of using value of i, it will literally use "i"
character.
>
> Any one know the way to concatenate the value of i to the mathematical
> expression?
>
Use

mytitle <- substitute(paste(delta^13,'C Station ', ival),
list(ival=i))

Duncan Murdoch