[R] a scope problem

Tony Plate tplate at blackmesacapital.com
Fri Jun 11 02:40:10 CEST 2004

This looks like it probably is a scope problem with non-standard evaluation 
rules for the argument subset= of nnet.

Instead of subset=sub[-i], try data=dftc[-i,]  (I've not tested this since 
I don't have the data objects you used.)

hope this helps,

Tony Plate

At Thursday 04:38 PM 6/10/2004, you wrote:
>  I have some code that looks like:
>     dftc <- df[sets$tcset,]
>     pt <- numeric(nrow(dftc))
>     sub <- 1:nrow(dftc)
>     for (i in 1:nrow(dftc)) {
>         n <- nnet( fmla, data=dftc, weights=wts, subset=sub[-i], size=4,
>         pt[i] <- predict( n, dftc[ i, ], type='class' )
>     }
>However running this give me the error:
>Error in eval(expr, envir, enclos) : Object "i" not found
>I have noted this problem in some other instances. For example if I
>define a function
>f <- function( dat, sets ) {
>   # use sets
>I sometimes get an error similar to that above.
>Does anybody know why this would happen?
>(R 1.9.0 on Fedora Core 2)
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