NumPy ufuncLesson 39Free preview

ufunc Differences

This lesson is part of NumPy · All levels

Summary

Calculating the difference between successive elements in an array is very useful for analyzing changes or differences in time series data. You can repeat the difference many times with the n parameter and change the direction of the calculation through the axis parameter. The value is ultimately reduced by one element per differentiation level.

Key points

Np.diff(array) produces a difference of consecutive elements (e[i+1] - e[i]).
The n parameter repeats the differential operation n times.
The axis parameters select the direction of differentiation on a multidimensional array.
Each n-level reduces the number of resulting elements by one.

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