Selecting local minima and maxima from pandas.Series

Even though s.values still works fine (Pandas 0.25), the recommended way is now:

argrelextrema(s.to_numpy(), np.greater)
# equivalent to:
argrelextrema(s.to_numpy(copy=False), np.greater)

While there is also an s.array property, using it here will fail with: TypeError: take() got an unexpected keyword argument 'axis'.

Note: copy=False means "don't force a copy", but it can still happen.

You probably want to use it like so,

argrelextrema(s.values, np.greater)

You are currently using the complete pandas Series while argrelextrema expects an nd array. s.values provides you with the nd.array

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