[R] problems with extractPrediction in package caret

[Uwe Ligges]

Häring, Tim (LWF) wrote:
> Hi list,
> 
> I´m working on a predictive modeling task using the caret package.
> I found the best model parameters using the train() and trainControl() command. Now I want to evaluate my model and make predictions on a test dataset. I tried to follow the instructions in the manual and the vignettes but unfortunately I´m getting an error message I can`t figure out.
> Here is my code:
> rfControl <- trainControl(method = "oob", returnResamp = "all", returnData=TRUE, verboseIter = TRUE)
> rftrain <- train(x=train_x, y=trainclass, method="rf", tuneGrid=tuneGrid, tr.control=rfControl)
> 
> pred <- predict(rftrain) 
> pred	# this works fine
> expred <- extractPrediction(rftrain)
> 
> Error in models[[1]]$trainingData : 
>   $ operator is invalid for atomic vectors


I cannot reproduce it (not having your data) and I doubt you are using 
the most recent version which is 3.51.
Anyway, *if* it is a bug, then please report to the package maintainer.

Best,
Uwe Ligges


> My predictors are 28 numeric attributes and one factor.
> I`m working with the latest version of caret and R 2.7.2 on WinXP.
> 
> Any advice is very welcome.
> 
> Thanks.
> TIM
> 
> 
> ------------------------------------------------------------------------------- 
> Dipl.-Geogr. Tim Häring
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