NumPy TutorialLesson 16Free preview

NumPy Array Filter

This lesson is part of NumPy · All levels

Summary

Array filtering uses boolean indexing, which is to place conditions such as arr > 10 in square brackets. The result contains only qualifying elements, so it replaces the if repetition manually. You can also use np.where or even create a filter pattern to generate new values.

Key points

Boolean indexing arr[condition] filters the elements according to the condition.
The condition can be combined with & (and) or ̊ (or), not and/or.
Np.where gives the position or value of the result of the selection.
A particular (divisible) pattern can be made from an element filter.

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