Try this:

titleline=expression(paste("Time evolution with ", alpha, "=0.2"))
plot(x, main=titleline,col="orange")

--Mark J. Lamias





________________________________
 From: bgnumis <bgnumis@gmail.com>
To: r-help@r-project.org 
Sent: Tuesday, November 20, 2012 3:47 PM
Subject: [R] Greek letters on title

Hi all,

I want to plot a series "x" and I want to put on title "Time evolution with
alpha=0.2", e.g.,

plot(x, main="Time evotion with alpha=0.2",col="orange")

Is there any posibility to put the greek letter and avoid  written the word?

Many thanks in advance.

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