[R] negative and positive values in diff. colors

[Rado Bonk]

Hi R-users,

I have a set of elevation residuals as geodata points. I would like to
display them in the following way:
-negative values using pch=20 (filled circle)
-positive values using pch=1  (empty circle)

while using the cex.max=5, cex.min=0.1 for points() to represent the
residuals value. Basically I would like to distinguish neagtive and
positive values at my map. How to do this.

Thanks in advance,

Rado

-- 
Radoslav Bonk M.S.
Dept. of Physical Geography and Geoecology
Faculty of Sciences, Comenius University
Mlynska Dolina 842 15, Bratislava, SLOVAKIA
tel: +421 2 602 96 250 e-mail: rbonk at host.sk
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