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2009 Apr 19
1
data$ID -> I always get a NULL
...from my database I get NULL, but I know that there is
sth!
For example:
> data$ID
NULL
> data$kod
NULL
but command like below is always recognize by R
> data[2,3]
[1] '082'
In my opinion this problem is also connect with my attempt to create a tree.
I always get errors.
> t.tree0=rpart(ID~.,t.train)
Error in eval(expr, envir, enclos) : object "ID" not found
> t.tree0=rpart(kod~.,t.train)
Error in eval(expr, envir, enclos) : object "kod" not found
What I should do to create my simple trees?
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