[R] Expression: +/-sigma

[David Winsemius]

On Jul 27, 2011, at 8:57 AM, ogbos okike wrote:

> Dear List,
> I am trying to label a plot with the symbol +/- sigma. Using  
> something like
> - expression (2*sigma) gives me the symbol 2ó. However, adding +/-  
> to it
> beats me.
> The code I am using is:  plot(x,y,type="l",main="  
> expression(paste("±",
> plain(2*ó)),sep="").
> Any suggestion will be appreciated.

1) If you are getting errors then you should post them.

2) There is no `sep =` argument in plotmath's paste function.

3) It is an error to put double quotes before the `expression`  
function call.

4) once those errors are corrected the "±" is properly rendered in the  
title.

> Best
> Ogbos
>
> 	[[alternative HTML version deleted]]
>
> ______________________________________________
> 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.

David Winsemius, MD
West Hartford, CT