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.
title.
a title which appears at the top of the plot. By default, the
name of the rpart endpoint is printed out.
filename
ASCII file to contain the output. By default, the name of the file is
the name of the object given by rpart (with the suffix .ps added). If
filename = "", the plot appears on the current graphical device.
digits
number of significant digits to include in numerical data.
pretty
an integer denoting the extent to which factor levels will be
abbreviated in the character strings defining the splits;
(0) signifies no abbreviation of levels. A NULL signifies using
elements of letters to represent the different factor levels. The
default (TRUE) indicates the maximum possible abbreviation.
use.n
Logical. If TRUE (default), adds to label
(#events level1/ #events level2/etc. for method class, n for
method anova, and #events/n for methods poisson and exp).
horizontal
Logical. If TRUE (default), plot is horizontal. If FALSE, plot
appears as landscape.
...
other arguments to the postscript function.
Details
The plot created uses the functions plot.rpart and text.rpart (with
the fancy option). The settings were chosen because they looked
good to us, but other options may be better, depending on the rpart
object.
Users are encouraged to write their own function containing favorite
options.
Side Effects
a plot of rpart is created using the postscript driver, or
the current device if filename = "".
See Also
plot.rpart, rpart, text.rpart, abbreviate
Examples
z.auto <- rpart(Mileage ~ Weight, car.test.frame)
post(z.auto, file = "") # display tree on active device
# now construct postscript version on file "pretty.ps"
# with no title
post(z.auto, file = "pretty.ps", title = " ")
z.hp <- rpart(Mileage ~ Weight + HP, car.test.frame)
post(z.hp)