[R] problem in pot with subset selection

[Ronaldo Reis Jr.]

Hi,

I try to make a selective plot, but it make an error. The subset only work 
with length < 4, it is correct?

> 
plot((ocorrencia/isca)~frag,subset=especieama==c("grupo1","grupo2","grupo3","AnoplotermesSp1","NeocapritermesOpacus"),pch=c(1,2,3,4,5),xlab="Área 
(ha)",ylab="Proporção de iscas ocupadas por térmitas")
Warning messages: 
1: longer object length
	is not a multiple of shorter object length in: is.na(e1) | is.na(e2) 
2: longer object length
	is not a multiple of shorter object length in: "==.default"(especieama, 
c("grupo1", "grupo2", "grupo3", "AnoplotermesSp1",  

I make the plot using points, but I want to know if this is a bug or real 
limitation in subset comparison.

I use R-1.7.1

Thanks
Ronaldo
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