Classifying boolean values

Hi to all, I'm new to this forum and new to R. I have to build a tree
classifier that has boolean values as response.
When I build the tree with:

echoknn.tree <- tree(class ~ ., data=echoknn.train)

where "class" is a coloumn of my dataset (echoknn.train) of boolean values,
the result is a tree where leaf nodes are numbers in the range [0,1]; but
this isn't the result that I expect to have. I'd want that result of
classifier is TRUE or FALSE.
Can someone help me?

Thanks.

Fabio


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