plot.rpart(rpart)
plot.rpart()所属R语言包：rpart
Plot an Rpart Object
绘制的软件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.
在当前图形上设备绘图的软件rpart的对象。
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.
一个装类的对象rpart，包含一个分类，回归，或速率树的。
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，均匀的垂直间距的节点，这可能是装修时更简洁到一个页面上的一个大图。默认的是使用在拟合的误差成比例的非均匀间距。
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.
控制形状的树枝从父到子节点。允许在任何数量从0到1。值为1给出了方肩分支，值0给V形分支，与其他值中间。
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，叶节点将在该的水平图坐标的1:nleaves。如果TRUE，程序将尝试安排比较紧凑的树。压实算法假定uniform=TRUE;令人惊讶的是，其结果通常是一个改进，即使当该情况并非如此。
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.
额外的空间之间的子节点的节点和叶的量相比，叶片之间的最小空间。适用于压缩树。默认是的branch。
参数：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).
一个额外的部分离开的空白边框周围的树。 （长的标签有时会被切掉的默认计算）。
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.
设置最小长度minbranch倍，平均枝长的一个分支。此参数被忽略，如果uniform=TRUE。分裂有时会非常小的改善，甚至是在所有的分类情况下没有改善。一个树的分支长度的严格比例，以改善留下任何余地地挤在节点标签。
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
详细信息----------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.
此功能的方法的通用函数plot，的对象类rpart。在树的顶部节点的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.
节点的坐标的形式返回一个列表，组件x和y。
副作用----------Side Effects----------
An unlabeled plot is produced on the current graphics device.
未标记的图是在当前图形上设备。
参见----------See Also----------
rpart, text.rpart
rpart，text.rpart
实例----------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。
|
发表于 2012-9-27 23:48:54
