Hi Gabor,

This works. This is exactly what I want. According to John Fox's reply, I used expression(NA>=1) and it also worked. Thanks for the kind and clever help.

Bingshan


Gabor Grothendieck wrote:
On Sun, Sep 21, 2008 at 11:23 AM, Li, Bingshan <[EMAIL PROTECTED]> wrote:
Hi John,

Yes, you are right. I meant "greater-than-or-equal". According to your suggestion, I can plot the symbol only. But what I want is 
to have >=1, >=2 and so on as labels on xaxis. I did not make it work. Do you know how to make it? The 
expression("">=1"") did not work, and paste(expression("">=""), 1)
did not work either.


Try this:

plot(1:10, xaxt = "n")
for(i in 1:10) axis(1, i, bquote(phantom(0) >= .(i)))


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