Creating an element-wise minimum Series from two other Series in Python Pandas

Question

I am having trouble finding a way to do an efficient element-wise minimum of two Series objects in pandas. For example I can add two Series easily enough:

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Answer 1

You can concat the dataframes and take the minimum, specifying level=0:

>>> s1 = pd.Series(data=[1,1,1], index=[1,2,3])
>>> s2 = pd.Series(data=[1,2,2,1], index=[1,2,3,4])
>>> pd.concat([s1, s2]).min(level=0)
1    1
2    1
3    1
4    1
dtype: int64

This approach also works on dataframes.