pandas.core.groupby.DataFrameGroupBy.diff¶
- DataFrameGroupBy.diff(periods=1, axis=0)[source]¶
First discrete difference of element.
Calculates the difference of each element compared with another element in the group (default is element in previous row).
- Parameters:
- periodsint, default 1
Periods to shift for calculating difference, accepts negative values.
- axisaxis to shift, default 0
Take difference over rows (0) or columns (1).
- Returns:
- Series or DataFrame
First differences.
See also
Series.groupbyApply a function groupby to a Series.
DataFrame.groupbyApply a function groupby to each row or column of a DataFrame.