[R-sig-Geo] Spplot error in change value color

[pierluigi de rosa]

Dear all,

I have a simple question.
I'm managing a SpatialPointsDataFrame with 12 columns

I'm able to plot it
this works:
> spplot(punti_eventi_siccita,zcol=6)  #only 6 column

I want to set value where change color
> custs=seq(20,250,50)
If I run this:

> spplot(punti_eventi_siccita,zcol=6,
colorkey=list(labels=list(at=cuts),at=cuts))
I have:
Error in legend[[i]]$fun : $ operator is invalid for atomic vectors

where I'm wrong?
I fund several example on internet and on several books but the code I
wrote above should work

Many thanks
Pierluigi


-- 
Ing. Pierluigi De Rosa (PhD)
cel: 3497558268 / fax: 075 7823038
skype: pierluigi.derosa

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