match.arg.ext(RSAGA)
match.arg.ext()所属R语言包：RSAGA
Extended Argument Matching
扩展参数匹配
译者：生物统计家园网 机器人LoveR
描述----------Description----------
match.arg.ext matches arg against a set of candidate values as specified by choices; it extends match.arg by allowing arg to be a numeric
match.arg.ext匹配arg对一组指定的候选值choices，延伸match.arg允许arg是一个数字
用法----------Usage----------
match.arg.ext(arg, choices, base = 1, several.ok = FALSE,
numeric = FALSE, ignore.case = FALSE)
参数----------Arguments----------
参数：arg
a character string or numeric value
字符串或数字值
参数：choices
a character vector of candidate values
字符向量的候选值
参数：base
numeric value, specifying the numeric index assigned to the first element of choices
数字值，指定分配给choices的第一个元素的数字索引
参数：several.ok
logical specifying if arg should be allowed to have more than one element
逻辑指定arg如果应该允许有一个以上的元素
参数：numeric
logical specifying if the function should return the numerical index (counting from base) of the matched argument, or, by default, its name
逻辑指定，如果该函数应该返回的数值指标的匹配baseument，或在默认情况下，它的名字（计数从arg）
参数：ignore.case
logical specifying if the matching should be case sensitive
逻辑指定的匹配应该是大小写敏感的
Details
详细信息----------Details----------
When choices are missing, they are obtained from a default setting for the formal argument arg of the function from which match.arg.ext was called.
当choices缺少，他们获得的正式参数arg的功能从match.arg.ext被称为从默认的设置。
Matching is done using pmatch (indirectly through a call to match.arg, so arg may be abbreviated.
进行匹配使用pmatch（间接地通过调用match.arg，这样arg可能是缩写。
If arg is numeric, it may take values between base and length(choices)+base-1. base=1 will give standard 1-based R indices, base=0 will give indices counted from zero
如果arg是数字，它可能需要之间的值base和length(choices)+base-1。 base=1会给基于标准的1 R值，base=0会给指数从零计算
值----------Value----------
If numeric is false and arg is a character string, the function returns the unabbreviated version of the unique partial match of arg if there is one; otherwise, an error is signalled if several.ok is false, as per default. When several.ok is true and there is more than one match, all unabbreviated versions of matches are returned.
numeric如果是假的，arg是一个字符串，该函数返回的未缩写版本的独特部分匹配arg，如果有一个，否则，一个错误的信号，如果several.ok是假的，根据默认的。当several.ok是真实的，有一个以上的比赛，所有的比赛缩写的版本被返回。
If numeric is false but arg is numeric, match.arg.ext returns name of the match corresponding to this index, counting from base; i.e. arg=base corresponds to choices[1].
如果numeric是虚假的，但arg是数字，match.arg.ext返回的匹配对应于索引的名称，计base，即arg=base对应的 X>。
If numeric is true, the function returns the numeric index(es) of the partial match of arg, counted from base to length(choices)+base-1. If arg is already numeric, the function only checks whether it falls into the valid range from arg to length(choices)+base-1 and returns arg.
如果numeric是真实的，该函数返回数字索引（ES）的部分匹配arg，自base到length(choices)+base-1。如果arg已经是数字，则函数只检查是否属于有效范围内arg到length(choices)+base-1和回报arg。
（作者）----------Author(s)----------
Alexander Brenning
参见----------See Also----------
match.arg, pmatch
match.arg，pmatch
实例----------Examples----------
# Based on example from 'match.arg':[基于例如从“match.arg”：]
require(stats)
center <- function(x, type = c("mean", "median", "trimmed")) {
type <- match.arg.ext(type,base=0)
switch(type,
mean = mean(x),
median = median(x),
trimmed = mean(x, trim = .1))
}
x <- rcauchy(10)
center(x, "t") # Works[作品]
center(x, 2) # Same, for base=0[同样，碱基= 0]
center(x, "med") # Works[作品]
center(x, 1) # Same, for base=0[同样，碱基= 0]
try(center(x, "m")) # Error[错误]
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 2012-9-28 21:16:47
