Expanding.
min
Calculate the expanding minimum.
Note
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.
Returned object type is determined by the caller of the expanding calculation.
See also
Series.expanding
Calling object with a Series.
DataFrame.expanding
Calling object with a DataFrame.
Series.min
Similar method for Series.
DataFrame.min
Similar method for DataFrame.
Examples
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