  Hi,

You may try something like:

    plot(rnorm(10), rnorm(10), main=expression("" %+-% 2*sigma))

HTH,
Yves

Le 27/07/2011 14:57, ogbos okike a écrit :
> 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.
> Best
> Ogbos
>
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