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I'm using rpart to fit a tree using a large dataset: 7000 observations, 4651 variables. All but one of the variables (age) are binary. When I run the code: fit1 <- rpart(lowergi ~ ., data=dset,method="class") I get the error: Error in dimnames(X) <-list(dn[1L]], unlist(collabs, use.names=FALSE)) : Length of `dimnames' [2] not equal to array extent I have no idea what this error means or what is causing the problem. I'm wondering if my dataset is...