dfr first
for dataframe
Show only the first number of rows or create a first expression
Signature
> dfr first {flags} (rows)
Parameters
rows
: starting from the front, the number of rows to return
Input/output types:
input | output |
---|---|
any | any |
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
Tips: Dataframe commands were not shipped in the official binaries by default, you have to build it with --features=dataframe
flag