head_tail: Return the First and Last Part of an Object
Description
Returns the first and last "parts" (rows or members) of a spectrum,
dataframe, vector, function, table or ftable. In other words, the combined
output from methods head and tail.
Usage
head_tail(x, n = 3L, ...)
# S3 method for default
head_tail(x, n = 3L, ...)
# S3 method for data.frame
head_tail(x, n = 3L, ...)
# S3 method for matrix
head_tail(x, n = 3L, ...)
# S3 method for function
head_tail(x, n = 6L, ...)
# S3 method for table
head_tail(x, n = 6L, ...)
# S3 method for ftable
head_tail(x, n = 6L, ...)
Arguments
x
an R object.
n
integer. If positive, n rows or members in the
returned object are copied from each of "head" and "tail" of x.
If negative, all except n elements of x from each of "head"
and "tail" are returned.
...
arguments to be passed to or from other methods.
Value
An object (usually) like x but smaller, except when
n = 0. For ftable objects x, a transformed
format(x).
Methods (by class)
default: Default method
data.frame: Specialization for data.frame objects
matrix: Specialization for matrix
function: Specialization for function
table: Specialization for table
ftable: Specialization for ftable
Details
The value returned by head_tail() is equivalent to row
binding the the values returned by head() and tail(),
although not implemented in this way. The same specializations as defined
in package 'utils' for head() and tail() have been
implemented.
See Also
head, and compare the examples and the values
returned to the examples below.