Plot a tree object on the current graphical device
# S3 method for tree
plot(x, y = NULL, type = c("proportional", "uniform"), ...)
an object of class "tree"
.
ignored. Used for positional matching of type
.
character string. If this partially matches
"uniform"
, the branches are of uniform
length. Otherwise they are proportional to the decrease in impurity.
graphical parameters.
An (invisible) list with components x
and y
giving the coordinates of the tree nodes.
As a side effect, the value of type == "uniform"
is stored in
the variable .Tree.unif.?
in the global environment, where ?
is the device number.