[R] Simple question about symbols()

[murilofm]

I'm new to R and i'm having some trouble with a bubble chart.
Basically I have 3 series (a,b,c), but the third one is a binnary variable
(assumes only 0 or 1 to the entire data).
How can I use these binnary information to make 2 different colours in a
bubble chart?. I.e., I'm using this code:


symbols(inv$a, inv$b, circles=radius, inches=0.35, fg="white",
bg="red", xlab="aa", ylab="bb", add=TRUE)

and i want the bg color to be red if c=1 and blue if c=0.

thanks,

Murilo

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