min() → FrameLike¶
Calculate the expanding minimum.
the current implementation of this API uses Spark’s Window without specifying partition specification. This leads to move all data into single partition in single machine and could cause serious performance degradation. Avoid this method against very large dataset.
- Series or DataFrame
Returned object type is determined by the caller of the expanding calculation.
Calling object with a Series.
Calling object with a DataFrame.
Similar method for Series.
Similar method for DataFrame.
Performing a expanding minimum with a window size of 3.
>>> s = ps.Series([4, 3, 5, 2, 6]) >>> s.expanding(3).min() 0 NaN 1 NaN 2 3.0 3 2.0 4 2.0 dtype: float64