detach(base)
detach()所属R语言包：base
Detach Objects from the Search Path
从搜索路径中分离对象
译者：生物统计家园网 机器人LoveR
描述----------Description----------
Detach a database, i.e., remove it from the search() path of available R objects. Usually this is either a data.frame which has been attached or a package which was attached by library.
分离，即一个数据库，从它的search()可用R对象的路径。这通常是已data.frameed或一个附加包attachlibrary。
用法----------Usage----------
detach(name, pos = 2, unload = FALSE, character.only = FALSE,
force = FALSE)
参数----------Arguments----------
参数：name
The object to detach. Defaults to search()[pos]. This can be an unquoted name or a character string but not a character vector. If a number is supplied this is taken as pos.
分离的对象。 search()[pos]默认。这可以是一个非上市的名称或一个字符串而不是一个字符向量。如果提供的数字，这是为pos。
参数：pos
Index position in search() of the database to detach. When name is a number, pos = name is used.
search()分离数据库的索引位置。当name是一个数字，pos = name使用。
参数：unload
A logical value indicating whether or not to attempt to unload the namespace when a package is being detached. If the package has a namespace and unload is TRUE, then detach will attempt to unload the namespace via unloadNamespace: if the namespace is imported by another namespace or unload is FALSE, no unloading will occur.
一个逻辑值，指示是否尝试卸载命名空间，当一个包被分离。如果包有一个命名空间和unload是TRUE，则detach会尝试卸载通过的命名空间unloadNamespace：如果另一个命名空间命名空间是由进口或<X >是unload，没有卸载，会发生。
参数：character.only
a logical indicating whether name can be assumed to be character strings.
逻辑是否name可以假定为字符串。
参数：force
logical: should a package be detached even though other attached packages depend on it?
逻辑：即使其他附着物包依赖于它的包分离？
Details
详情----------Details----------
This is most commonly used with a single number argument referring to a position on the search list, and can also be used with a unquoted or quoted name of an item on the search list such as package:tools.
这是最常用的单数指的是在搜索列表中的位置的说法，也可用于非上市或报价的搜索列表，如package:tools一个项目的名称。
If a package has a namespace, detaching it does not by default unload the namespace (and may not even with unload=TRUE), and detaching will not in general unload any dynamically loaded compiled code (DLLs). Further, registered S3 methods from the namespace will not be removed. If you use library on a package whose namespace is loaded, it attaches the exports of the already loaded namespace. So detaching and re-attaching a package may not refresh some or all components of the package, and is inadvisable.
如果一个包有一个命名空间，分离它不默认情况下，卸载命名空间（不得即使unload=TRUE），分离一般不卸载任何动态加载编译后的代码（DLL）中。此外，注册S3的命名空间的方法不会被删除。如果你使用library加载包的命名空间，它十分重视出口已加载的命名空间。因此，分离和重新附加一个包可能不刷新的部分或全部组件的包，是不可取的。
值----------Value----------
The return value is invisible. It is NULL when a package is detached, otherwise the environment which was returned by attach when the object was attached (incorporating any changes since it was attached).
返回值是无形的。它是NULL包时，分离，否则的环境，这是由attach返回连接对象时（包含任何的变化，因为它是连接）。
注意----------Note----------
You cannot detach either the workspace (position 1) nor the base package (the last item in the search list), and attempting to do so will throw an error.
你不能分离的工作区（位置1），也不base包（在搜索列表中的最后一个项目），并试图这样做，会抛出一个错误。
Unloading some namespaces has undesirable side effects: e.g. unloading grid closes all graphics devices, and on most systems tcltk cannot be reloaded once it has been unloaded and may crash R if this is attempted.
卸载一些命名空间有不良副作用的影响：如卸“grid关闭所有的图形设备，在大多数系统上tcltk不能重装一旦被卸载，可能会崩溃R如果这是尝试。
参考文献----------References----------
The New S Language. Wadsworth & Brooks/Cole.
参见----------See Also----------
attach, library, search, objects, unloadNamespace, library.dynam.unload .
attach，library，search，objects，unloadNamespace，library.dynam.unload。
举例----------Examples----------
require(splines) # package[包]
detach(package:splines)
## or also[＃]
library(splines)
pkg <- "package:splines"
detach(pkg, character.only = TRUE)
## careful: do not do this unless 'splines' is not already attached.[＃注意：不这样做，除非“样条”尚未连接。]
library(splines)
detach(2) # 'pos' used for 'name'[POS为名]
## an example of the name argument to attach[＃附加一个名称参数的例子]
## and of detaching a database named by a character vector[＃和分离由特征向量命名数据库]
attach_and_detach <- function(db, pos=2)
{
name <- deparse(substitute(db))
attach(db, pos=pos, name=name)
print(search()[pos])
detach(name, character.only = TRUE)
}
attach_and_detach(women, pos=3)
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 19:21:37
