diff(self, periods: 'int' = 1, axis: 'Axis' = 0) -> 'DataFrame'
Calculates the difference of a Dataframe element compared with another element in the Dataframe (default is element in previous row).
For boolean dtypes, this uses operator.xor
rather than operator.sub
. The result is calculated according to current dtype in Dataframe, however dtype of the result is always float64.
Periods to shift for calculating difference, accepts negative values.
Take difference over rows (0) or columns (1).
First differences of the Series.
First discrete difference of element.
Dataframe.pct_change
Percent change over given number of periods.
Dataframe.shift
Shift index by desired number of periods with an optional time freq.
Series.diff
First discrete difference of object.
Difference with previous row
This example is valid syntax, but we were not able to check execution>>> df = pd.DataFrame({'a': [1, 2, 3, 4, 5, 6],This example is valid syntax, but we were not able to check execution
... 'b': [1, 1, 2, 3, 5, 8],
... 'c': [1, 4, 9, 16, 25, 36]})
... df a b c 0 1 1 1 1 2 1 4 2 3 2 9 3 4 3 16 4 5 5 25 5 6 8 36
>>> df.diff() a b c 0 NaN NaN NaN 1 1.0 0.0 3.0 2 1.0 1.0 5.0 3 1.0 1.0 7.0 4 1.0 2.0 9.0 5 1.0 3.0 11.0
Difference with previous column
This example is valid syntax, but we were not able to check execution>>> df.diff(axis=1) a b c 0 NaN 0 0 1 NaN -1 3 2 NaN -1 7 3 NaN -1 13 4 NaN 0 20 5 NaN 2 28
Difference with 3rd previous row
This example is valid syntax, but we were not able to check execution>>> df.diff(periods=3) a b c 0 NaN NaN NaN 1 NaN NaN NaN 2 NaN NaN NaN 3 3.0 2.0 15.0 4 3.0 4.0 21.0 5 3.0 6.0 27.0
Difference with following row
This example is valid syntax, but we were not able to check execution>>> df.diff(periods=-1) a b c 0 -1.0 0.0 -3.0 1 -1.0 -1.0 -5.0 2 -1.0 -1.0 -7.0 3 -1.0 -2.0 -9.0 4 -1.0 -3.0 -11.0 5 NaN NaN NaN
Overflow in input dtype
This example is valid syntax, but we were not able to check execution>>> df = pd.DataFrame({'a': [1, 0]}, dtype=np.uint8)See :
... df.diff() a 0 NaN 1 255.0
The following pages refer to to this document either explicitly or contain code examples using this.
pandas.core.generic.NDFrame.pct_change
pandas.core.series.Series.diff
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