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When I run this code (R 2.13.2, caret 4.98 on windows 7):

library(caret)
data(iris)
TrainData <- iris[,1:4]
TrainClasses <- iris[,5]
rfFit <- train(TrainData, TrainClasses,
                 method = "rf",
                 tuneLength = 3,
                 trControl = trainControl(method = "oob"))

I get the following error:

Fitting: mtry=2 
Fitting: mtry=3 
Fitting: mtry=4 
Aggregating results
Selecting tuning parameters
Fitting model on full training set
Error in structure(list(method = method, modelType = modelType, results = performance,  : 
  object 'resampledCM' not found

What am I doing wrong?

/edit: I updated to caret 4.99 using R forge, and the problem goes away. It seems to have been unique to caret 4.98 and R 2.13.2.

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  • $\begingroup$ Which version of caret are you using? (It works for me with caret v. 5.01-001, R v. 2.13.2.) $\endgroup$ – chl Oct 7 '11 at 17:50
  • $\begingroup$ @chl: I'm using caret 4.98 and R 2.13.2. I guess I have to wait until the windows version of caret on CRAN is updated. $\endgroup$ – Zach Oct 7 '11 at 19:25
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I am using 4.98 and R.2.13.0 - and the code works for me as well. It looks similar to what happens when I break Caret when I forget to remove my own custom functions (I no longer modify the default for this reason). If you have checked:

trainControl()

and haven't found anything - that is my only suggestion.

I have broken Caret many, many times and have never seen that specific error. I have seen it with "object 'XXXXX' not found"

With XXXX being in some function I made.

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  • $\begingroup$ It works for me on R 2.12.1. The problem seems to be specific to R 2.13.1 and 2.13.2. $\endgroup$ – Zach Oct 13 '11 at 16:08

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