snip.rpart(rpart)
snip.rpart()所属R语言包：rpart
Snip Subtrees of an Rpart Object
一个软件rpart对象剪断子树
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“剪断”软件rpart对象，包含的节点保持选定的子树后，已被剪掉。用户可以剪掉，或交互式图形窗口内指定节点上点击鼠标按钮的节点折腾参数。
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.
拟合模型对象类rpart。这被认为是一些功能，产生一个具有相同的命名组件对象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>
整数向量指数的所有子树（节点号）被剪掉。如果丢失，用户选择的树枝剪掉如下所述。 </ TABLE>
Details
详情----------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.
聚类的rpart预计将图形设备上可见，图形输入设备（如鼠标）要求。节点上单击（选择按钮），显示的节点数量，样本大小，响应y值，错误（DEV）。点击第二次在同一节点剪子树子树和视觉关闭擦除。这个过程可能会重复次数。警告导致选择根或叶节点。点击退出按钮，将停止剪的过程，并返回生成的rpart对象。
See the documentation for the specific graphics device for details on graphical input techniques.
看到图形输入技术的详细信息，为特定的图形设备的文档。
值----------Value----------
A rpart object containing the nodes that remain after specified or selected subtrees have been snipped off.
一个rpart对象，其中包含的节点后，指定或选定的子树仍然被剪掉。
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).
视觉擦除图与背景颜色，绘制完成。这不会做任何事情，如果背景是透明的（经常屏幕设备）。
参见----------See Also----------
plot.rpart
plot.rpart
举例----------Examples----------
## dataset not in R[＃集研发]
## Not run: [＃无法运行：]
z.survey <- rpart(market.survey) #grow the rpart object[增长软件rpart对象]
plot(z.survey) #plot the tree[绘制树]
z.survey2 <- snip.rpart(z.survey,toss=2) #trim subtree at node 2[在节点2，修剪子树]
plot(z.survey2) #plot new tree[图新树]
# can also interactively select the node using the mouse in the[也可以交互使用鼠标在选择节点]
# 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 2012-2-16 19:18:04
