`library(caret) set.seed(1) x <- data.frame(runif(10),runif(10)) y <- rnorm(10) rfeModel <- rfe(x,y,rfeControl = rfeControl(functions = lmFuncs)) `

returns:

Error in { : task 1 failed – "undefined columns selected"

While this code:

`data(BloodBrain) x <- scale(bbbDescr[,-nearZeroVar(bbbDescr)]) x <- x[, -findCorrelation(cor(x), .8)] x <- as.data.frame(x) lmProfile <- rfe(x, logBBB,rfeControl = rfeControl(functions = lmFuncs)) `

Works fine. What am I doing wrong in the 1st example? (I get the same error in R 2.14.0 and 2.13.2)

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#### Best Answer

You have to specify the `sizes`

argument ($leq 2$ in your example). The default value in `rfe`

is `sizes=2^(2:4)`

, but you only have two features.

`?rfe`

Arguments

- …
sizes

a numeric vector of integers corresponding to the number of features that should be retained

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