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Home Artificial Intelligence

Introducing NumPy, Half 3: Manipulating Arrays | by Lee Vaughan | Sep, 2024

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September 15, 2024
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Shaping, transposing, becoming a member of, and splitting arrays

Lee Vaughan

Towards Data Science

A grayscale Rubik’s cube hits itself with a hammer, breaking off tiny cubes.
Manipulating an array as imagined by DALL-E3

Welcome to Half 3 of Introducing NumPy, a primer for these new to this important Python library. Half 1 launched NumPy arrays and create them. Half 2 coated indexing and slicing arrays. Half 3 will present you manipulate current arrays by reshaping them, swapping their axes, and merging and splitting them. These duties are useful for jobs like rotating, enlarging, and translating pictures and becoming machine studying fashions.

NumPy comes with strategies to vary the form of arrays, transpose arrays (invert columns with rows), and swap axes. You’ve already been working with the reshape() technique on this collection.

One factor to pay attention to with reshape() is that, like all NumPy assignments, it creates a view of an array slightly than a copy. Within the following instance, reshaping the arr1d array produces solely a short lived change to the array:

In [1]: import numpy as np

In [2]: arr1d = np.array([1, 2, 3, 4])

In [3]: arr1d.reshape(2, 2)
Out[3]:
array([[1, 2],
[3, 4]])

In [4]: arr1d
Out[4]: array([1, 2, 3, 4])

This habits is helpful if you wish to briefly change the form of the array to be used in a…

Tags: ArraysIntroducingLeeManipulatingNumPyPartSepVaughan

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