[R] Plotting rpart trees with long list of class members

MarkBeauchene MarkBeauchene at hotmail.com
Mon Jul 9 22:42:32 CEST 2012

Here is some sample code.  It generates a class (list_var) that is used in
rpart.  list_val is the dependant variable.

The plot shows all the values of the class, which is a mess and makes the
plot unuseable.  I'd like to either suppress the list entirely or replace it
with something like "Group 1", "Group 2", etc.

list_var <- rep(NA,2000)
list_val <- rep(NA,2000)
for (i in 1:1000) {
list_var[i] <- paste("A",i%/%25,sep='')
list_val[i] <- runif(1,0,1) }
test_set <- data.frame(list_var, list_val )

testtree <- rpart ( list_val ~ list_var, data = test_set )
rpart.plot(testtree, type=3)

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