snip.rpart(rpart)
snip.rpart()所属R语言包：rpart
Snip Subtrees of an Rpart Object
剪断的子树的一个软件rpart的对象
译者：生物统计家园网 机器人LoveR
描述----------Description----------
Creates a "snipped" rpart object, containing the nodes that remain after selected subtrees have been snipped off. The user can snip nodes using the toss argument, or interactively by clicking the mouse button on specified nodes within the graphics window.
创建一个“剪断”的的软件rpart对象，节点后仍然选定的子树都被剪掉。用户可以剪掉节点使用折腾参数，或以交互方式在图形窗口中指定的节点上单击鼠标按钮。
用法----------Usage----------
snip.rpart(x, toss)
参数----------Arguments----------
参数：x
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.
拟合模型对象的类rpart。这被认为是一些函数，该函数产生的对象具有相同的命名组件rpart函数返回的结果。
参数：toss
an integer vector containing indices (node numbers) of all subtrees to be snipped off. If missing, user selects branches to snip off as described below. </table>
一个整数向量指数（节点编号），所有的子树被剪掉。如果缺少，用户选择分支剪掉，如下所述。 </ TABLE>
Details
详细信息----------Details----------
A dendrogram of rpart is expected to be visible on the graphics device, and a graphics input device (e.g., a mouse) is required. Clicking (the selection button) on a node displays the node number, sample size, response y-value, and Error (dev). Clicking a second time on the same node snips that subtree off and visually erases the subtree. This process may be repeated an number of times. Warnings result from selecting the root or leaf nodes. Clicking the exit button will stop the snipping process and return the resulting rpart object.
rpart进行的聚类分析，预计在图形设备上是可见的，并需要一个图形输入设备（如鼠标）。单击（选择按钮）的节点上显示的节点数量，样本大小，响应y值和错误（DEV）。单击第二次在同一节点上剪的子树的子树关闭和视觉擦除。该过程可重复的次数。警告导致选择根或叶节点。单击“退出”按钮，将停止剪断的过程，并返回得到的rpart对象。
See the documentation for the specific graphics device for details on graphical input techniques.
为特定的图形设备的图形输入技术的详细信息，请参阅文档。
值----------Value----------
A rpart object containing the nodes that remain after specified or selected subtrees have been snipped off.
Arpart对象，其中包含指定或选择的子树后，剩余节点已经被剪掉。
警告----------Warning----------
Visually erasing the plot is done by over-plotting with the background colour. This will do nothing if the background is transparent (often true for screen devices).
视擦除的图是通过在与背景颜色的绘图。这会做什么，如果背景是透明的（通常是真实的屏幕设备）。
参见----------See Also----------
plot.rpart
plot.rpart
实例----------Examples----------
## dataset not in R[＃数据集在R]
## Not run: [＃不运行：]
z.survey <- rpart(market.survey) #grow the rpart object[增长的软件rpart的对象]
plot(z.survey) #plot the tree[绘制树]
z.survey2 <- snip.rpart(z.survey,toss=2) #trim subtree at node 2[修剪子树节点2]
plot(z.survey2) #plot new tree[图新树]
# can also interactively select the node using the mouse in the[也可以交互地选择节点，用鼠标在]
# graphics window[图形窗口]
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 2012-9-27 23:50:19
