"plot"(x, uniform = FALSE, branch = 1, compress = FALSE, nspace, margin = 0, minbranch = 0.3, ...)
"rpart"
, containing a classification,
regression, or rate tree.
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.
FALSE
, the leaf nodes will be at the horizontal 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.
branch
.
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.
x
and y
.
text
command for adding labels, some extra information about the
plot needs be retained. This is kept in an environment in the package.plot
, for objects
of class rpart
.
The y-coordinate of the top node of the tree will always be 1.
rpart
, text.rpart
fit <- rpart(Price ~ Mileage + Type + Country, cu.summary)
par(xpd = TRUE)
plot(fit, compress = TRUE)
text(fit, use.n = TRUE)
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