R语言返回对象的第一部分或最后一部分head()函数-中英文对照帮助文档

MicroRbt

        R语言返回对象的第一部分或最后一部分head()函数-中英文对照帮助文档

                                         By MicroRbt Martinez PhD

R语言函数名：head()
R语言函数功能：返回对象的第一部分或最后一部分
来自资源库：基础库（R语言自带）
head()函数所属R语言包：所在R包具体名称、包功能的中英文双语描述见正文后面'--所在R语言包信息--'部分。

描述-----Description-----

Returns the first or last parts of a vector, matrix, table, data frame or function. Since head() and tail() are generic functions, they may also have been extended to other classes.
返回向量，矩阵，表，数据框或函数的第一部分或最后一部分。由于head()和tail()是通用函数，因此它们也可能已扩展到其他类。


使用方法-----Usage-----

head(x, ...)
## Default S3 methodefault S3 method:
默认的S3方法：

head(x, n = 6L, ...)
## S3 method for class 'matrix' S3 method for class 'matrix'
head(x, n = 6L, ...) # is exported as head.matrix()is exported as head.matrix()
导出为head.matrix（）

## NB: The methods for 'data.frame' and 'array'  are identical to the 'matrix' oneNB: The methods for 'data.frame' and 'array' are identical to the 'matrix' one
注意：“ data.frame”和“ array”的方法与“ matrix”相同

## S3 method for class 'ftable' S3 method for class 'ftable'
head(x, n = 6L, ...)
## S3 method for class 'function' S3 method for class 'function'
head(x, n = 6L, ...)
tail(x, ...)
## Default S3 methodefault S3 method:
默认的S3方法：

tail(x, n = 6L, keepnums = FALSE, addrownums, ...)
## S3 method for class 'matrix' S3 method for class 'matrix'
tail(x, n = 6L, keepnums = TRUE, addrownums, ...) # exported as tail.matrix()exported as tail.matrix()
导出为tail.matrix（）

## NB: The methods for 'data.frame', 'array', and 'table'NB: The methods for 'data.frame', 'array', and 'table'
注意：“ data.frame”，“ array”和“ table”的方法

##     are identical to the  'matrix'  oneare identical to the 'matrix' one
与“矩阵”相同

## S3 method for class 'ftable' S3 method for class 'ftable'
tail(x, n = 6L, keepnums = FALSE, addrownums, ...)
## S3 method for class 'function' S3 method for class 'function'
tail(x, n = 6L, ...)

参数-----Arguments-----

参数x介绍: an object
一个东西

参数n介绍: an integer vector of length up to dim(x) (or 1, for non-dimensioned objects). Values specify the indices to be selected in the corresponding dimension (or along the length) of the object. A positive value of n includes the first/last n indices in that dimension, while a negative value excludes the last/first abs(n), including all remaining indices. NA or non-specified values (when length(n) < length(dim(x))) select all indices in that dimension

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