polars.LazyFrame.gather_every#
- LazyFrame.gather_every(n: int, offset: int = 0) LazyFrame [source]#
Take every nth row in the LazyFrame and return as a new LazyFrame.
- Parameters:
- n
Gather every n-th row.
- offset
Starting index.
Examples
>>> lf = pl.LazyFrame( ... { ... "a": [1, 2, 3, 4], ... "b": [5, 6, 7, 8], ... } ... ) >>> lf.gather_every(2).collect() shape: (2, 2) ┌─────┬─────┐ │ a ┆ b │ │ --- ┆ --- │ │ i64 ┆ i64 │ ╞═════╪═════╡ │ 1 ┆ 5 │ │ 3 ┆ 7 │ └─────┴─────┘ >>> lf.gather_every(2, offset=1).collect() shape: (2, 2) ┌─────┬─────┐ │ a ┆ b │ │ --- ┆ --- │ │ i64 ┆ i64 │ ╞═════╪═════╡ │ 2 ┆ 6 │ │ 4 ┆ 8 │ └─────┴─────┘