dask.dataframe.Index.sub

dask.dataframe.Index.sub

Index.sub(other, level=None, fill_value=None, axis=0)

Return Subtraction of series and other, element-wise (binary operator sub).

This docstring was copied from pandas.core.series.Series.sub.

Some inconsistencies with the Dask version may exist.

Equivalent to series - other, but with support to substitute a fill_value for missing data in either one of the inputs.

Parameters
otherSeries or scalar value
levelint or name

Broadcast across a level, matching Index values on the passed MultiIndex level.

fill_valueNone or float value, default None (NaN)

Fill existing missing (NaN) values, and any new element needed for successful Series alignment, with this value before computation. If data in both corresponding Series locations is missing the result of filling (at that location) will be missing.

axis{0 or ‘index’}

Unused. Parameter needed for compatibility with DataFrame.

Returns
Series

The result of the operation.

See also

Series.rsub

Reverse of the Subtraction operator, see Python documentation for more details.

Examples

>>> a = pd.Series([1, 1, 1, np.nan], index=['a', 'b', 'c', 'd'])  
>>> a  
a    1.0
b    1.0
c    1.0
d    NaN
dtype: float64
>>> b = pd.Series([1, np.nan, 1, np.nan], index=['a', 'b', 'd', 'e'])  
>>> b  
a    1.0
b    NaN
d    1.0
e    NaN
dtype: float64
>>> a.subtract(b, fill_value=0)  
a    0.0
b    1.0
c    1.0
d   -1.0
e    NaN
dtype: float64