dfr first for dataframe

Show only the first number of rows or create a first expression

WARNING

Dataframe commands were not shipped in the official binaries by default, you have to build it with --features=dataframe flag

Signature

> dfr first {flags} (rows)

Parameters

  • rows: starting from the front, the number of rows to return

Input/output types:

inputoutput
anyany

Examples

Return the first row of a dataframe

> [[a b]; [1 2] [3 4]] | dfr into-df | dfr first
╭───┬───┬───╮
 # │ a │ b │
├───┼───┼───┤
 0  1  2 
╰───┴───┴───╯

Return the first two rows of a dataframe

> [[a b]; [1 2] [3 4]] | dfr into-df | dfr first 2
╭───┬───┬───╮
 # │ a │ b │
├───┼───┼───┤
 0  1  2 
 1  3  4 
╰───┴───┴───╯

Creates a first expression from a column

> dfr col a | dfr first