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, ...)
# 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.
...
arguments to be passed to or from other methods.
n
a single integer. If positive, half the size for the resulting
object: number of elements for a vector (including lists), rows for a
matrix or data frame or lines for a function, to be retained from each
end. If negative, all but the n last and n first number of elements of x.
Value
An object (usually) like x but generally smaller. For ftable objects
x, a transformed format(x).
Methods (by class)
default:
data.frame:
matrix:
function:
table:
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.