Return the first and last parts of an object

Applies to both rows and columns, enabling quick inspection during interactive use.

Usage

headtail(x, ...)

# S4 method for data.frame
headtail(x, n = 2L)

# S4 method for list
headtail(x, n = 2L)

# S4 method for matrix
headtail(x, n = 2L)

# S4 method for vector
headtail(x, n = 2L)

Arguments

x

Object.

n

integer(1). Positive integer denoting the number of first and last items to include.

...

Additional arguments.

Value

Invisible NULL.

Details

Inspired by the print() method for DataFrame class objects.

Functions

• headtail,data.frame-method: Same method as matrix.

• headtail,list-method: Paste collapse to a character(1).

• headtail,matrix-method: Show first and last rows.

Note

Updated 2021-10-14.

See also

• utils::head(), utils::tail().

• cat().

Examples

data(mtcars, package = "datasets")

## data.frame ====
headtail(mtcars)
#>                mpg cyl ... gear carb
#> Mazda RX4       21   6 ...    4    4
#> Mazda RX4 Wag   21   6 ...    4    4
#> ...            ... ... ...  ...  ...
#> Maserati Bora   15   8 ...    5    8
#> Volvo 142E    21.4   4 ...    4    2