polars.LazyFrame.interpolate

LazyFrame.interpolate() → LDF

Interpolate intermediate values. The interpolation method is linear.

Examples

>>> df = pl.DataFrame(
...     {
...         "foo": [1, None, 9, 10],
...         "bar": [6, 7, 9, None],
...         "baz": [1, None, None, 9],
...     }
... ).lazy()
>>> df.interpolate().collect()
shape: (4, 3)
┌─────┬──────┬─────┐
│ foo ┆ bar  ┆ baz │
│ --- ┆ ---  ┆ --- │
│ i64 ┆ i64  ┆ i64 │
╞═════╪══════╪═════╡
│ 1   ┆ 6    ┆ 1   │
├╌╌╌╌╌┼╌╌╌╌╌╌┼╌╌╌╌╌┤
│ 5   ┆ 7    ┆ 3   │
├╌╌╌╌╌┼╌╌╌╌╌╌┼╌╌╌╌╌┤
│ 9   ┆ 9    ┆ 6   │
├╌╌╌╌╌┼╌╌╌╌╌╌┼╌╌╌╌╌┤
│ 10  ┆ null ┆ 9   │
└─────┴──────┴─────┘