[R] contingency table

[John Kane]

Have a look at 
length(iris$Species)
length(prev)
--- Carla Rebelo <crebelo at liaad.up.pt> wrote:

> Hello!
> 
> May you help me? I'm trying to do a contingency
> table using this
> 
>  > data(iris)
>  > library(rpart)
>  > modelo <- rpart(Species ~., iris)
>  > prev <- predict(modelo, iris)
> 
> Finally the contingency table
>  > table(iris$Species, prev)
> But an error occurs:
> Error in table(iris$Species, prev) :
>   all arguments must have the same length
> 
> And I do not understand why, may you help me?
> 
> Thank You!
> 
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