Plot an Rpart Object
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 = 0.3, ...)x |
a fitted object of class |
uniform |
if |
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 |
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
|
margin |
an extra fraction 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 |
... |
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: one being opened if needed.
In order to build up a plot in the usual S style, e.g., a separate
text command for adding labels, some extra information about the
plot needs be retained. This is kept in an environment in the package.
fit <- rpart(Price ~ Mileage + Type + Country, cu.summary) par(xpd = TRUE) plot(fit, compress = TRUE) text(fit, use.n = TRUE)
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