| plot.rpart {rpart} | R Documentation |
Plots an rpart object on the current graphics device.
## S3 method for class 'rpart':
plot(x, uniform=FALSE, branch=1, compress=FALSE, nspace,
margin=0, minbranch=.3, ...)
x |
a fitted object of class rpart, containing a classification,
regression, or rate tree.
|
uniform |
if TRUE, uniform vertical spacing of the nodes is used; this may be
less cluttered when fitting a large plot onto a page.
The default is to use a non-uniform spacing proportional to the
error in the fit.
|
branch |
controls the shape of the branches from parent to child node. Any number from 0 to 1 is allowed. A value of 1 gives square shouldered branches, a value of 0 give V shaped branches, with other values being intermediate. |
compress |
if FALSE, the leaf nodes will be at the horzontal plot coordinates of
1:nleaves.
If TRUE, the routine attempts a more compact arrangement of
the tree.
The compaction algorithm assumes uniform=TRUE; surprisingly, the result
is usually an improvement even when that is not the case.
|
nspace |
the amount of extra space between a node with children and
a leaf, as compared to the minimal space between leaves.
Applies to compressed trees only. The default is the value of
branch.
|
margin |
an extra percentage of white space to leave around the borders of the tree. (Long labels sometimes get cut off by the default computation). |
minbranch |
set the minimum length for a branch to minbranch times the average
branch length. This parameter is ignored if uniform=TRUE.
Sometimes a split will give very little improvement, or even (in
the classification case) no improvement at all.
A tree with branch lengths strictly proportional to improvement
leaves no room to squeeze in node labels.
|
... |
arguments to be passed to or from other methods. |
This function is a method for the generic function plot, for objects
of class rpart.
The y-coordinate of the top node of the tree will always be 1.
the coordinates of the nodes are returned as a list, with
components x and y.
an unlabeled plot is produced on the current graphics device.
data(cu.summary) fit <- rpart(Price ~ Mileage + Type + Country, cu.summary) plot(fit, compress=TRUE) text(fit, use.n=TRUE)