plot.rpart(rpart)
plot.rpart()所属R语言包：rpart
Plot an Rpart Object
绘制软件rpart对象
译者：生物统计家园网 机器人LoveR
描述----------Description----------
Plots an rpart object on the current graphics device.
图当前图形设备上的软件rpart对象。
用法----------Usage----------
## S3 method for class 'rpart'
plot(x, uniform=FALSE, branch=1, compress=FALSE, nspace,
margin=0, minbranch=.3, ...)
参数----------Arguments----------
参数：x
a fitted object of class rpart, containing a classification, regression, or rate tree.
装一类对象rpart，包含分类，回归，或利率树。
参数：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.
如果TRUE，统一垂直间距节点使用，这可能是装修时不凌乱到一个页面上的一个大图。默认的是使用非均匀间距成正比，在合适的错误。
参数：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.
从父到子节点控制树枝的形状。允许任何数量从0到1。值1提供方承担分支，值为0 V形分行，其他值中间。
参数：compress
if 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.
如果FALSE，叶节点是在横向的图1:nleaves坐标。如果TRUE例行试图树的安排比较紧凑。压缩算法假定uniform=TRUE;令人惊讶的是，结果通常是一个进步，即使是情况并非如此。
参数：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.
一个孩子的节点和叶之间的额外空间量相比，叶之间的最小空间。适用于仅压缩树木。默认是值branch。
参数：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).
一个空白的额外百分比离开周围的树的边界。 （长的标签，有时会默认计算）。
参数：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.
设置一个分支minbranch倍，平均枝长的最小长度。如果uniform=TRUE此参数被忽略。有时分裂会给很少的改善，甚至（分类情况）没有任何改善。具有严格的比例，以改善树分支长度，叶无房挤在节点的标签。
参数：...
arguments to be passed to or from other methods. </table>
参数被传递到或从其他方法。 </ TABLE>
Details
详情----------Details----------
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.
这个函数是一个方法，泛型函数plot类rpart的对象。树的顶端节点y坐标将始终为1。
值----------Value----------
The coordinates of the nodes are returned as a list, with components x and y.
节点的坐标返回一个列表，组件x和y。
副作用----------Side Effects----------
An unlabeled plot is produced on the current graphics device.
当前图形设备上产生的未标记的图。
参见----------See Also----------
rpart, text.rpart
rpart，text.rpart
举例----------Examples----------
fit <- rpart(Price ~ Mileage + Type + Country, cu.summary)
plot(fit, compress=TRUE)
text(fit, use.n=TRUE)
转载请注明:出自 生物统计家园网(http://www.biostatistic.net)。
注：
注1：为了方便大家学习，本文档为生物统计家园网机器人LoveR翻译而成，仅供个人R语言学习参考使用，生物统计家园保留版权。
注2：由于是机器人自动翻译，难免有不准确之处，使用时仔细对照中、英文内容进行反复理解，可以帮助R语言的学习。
注3：如遇到不准确之处，请在本贴的后面进行回帖，我们会逐渐进行修订。
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发表于 2012-2-16 19:29:18
