This function provides labels for the branches of an rpart tree.
# S3 method for rpart
labels(object, digits = 4, minlength = 1L, pretty, collapse = TRUE, ...)
Vector of split labels (collapse = TRUE) or matrix of left and
right splits (collapse = FALSE) for the supplied rpart
object. This function is called by printing methods for rpart
and is not intended to be called directly by the users.
fitted model object of class "rpart". This is assumed to be the
result of some function that produces an object with the same named
components as that returned by the rpart function.
the number of digits to be used for numeric values.
All of the rpart functions that call labels
explicitly set this value, with options("digits")
as the default.
the minimum length for abbreviation of character or factor variables.
If 0 no abbreviation is done; if 1 single English letters are
used, first lower case than upper case (with a maximum of 52
levels). If the value is greater than , the abbreviate
function is used, passed the minlength argument.
an argument included for compatibility with the tree package:
pretty = 0 implies minlength = 0L,
pretty = NULL implies minlength = 1L, and
pretty = TRUE implies minlength = 4L.
logical. The returned set of labels is always of the same length as the number of nodes in the tree.
If collapse = TRUE (default),
the returned value is a vector of labels for the branch leading into
each node, with "root" as the label for the top node.
If FALSE, the returned value is a two
column matrix of labels for the left and right branches leading
out from each node, with "leaf" as the branch labels for terminal
nodes.
optional arguments to abbreviate.