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NumPy in a Nutshell

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Reshaping

Sometimes situations arise when we need to somehow change our array, for example, change the size of the array or go from an array of one dimension to an array of another dimension, but with the same data that was originally used. But it is not always convenient to recreate the array from scratch, so some functions modify the array as we need it.

Let's have a look at some of them:

  • np.reshape() - this function changes the shape of an N-dimensional array while maintaining the same total number of elements;

  • np.transpose() - this function transposes the array, essentially swapping its axes;

  • np.concatenate() - this function creates a new array by appending arrays one after another along the specified axis;

  • np.resize() - this function is used to resize an array, creating a copy of the original array with the specified size.

Reshape one-dimensional array into a two-dimensional array:

import numpy as np

array = np.array([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12])
new_array = array.reshape(4, 3)

print(new_array)

              
123456

            
import numpy as np

array  = np.array([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12])
new_array = array.reshape(4, 3)

print(new_array)
copy

Reshape one-dimensional into a three-dimensional array:

import numpy as np

array = np.array([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12])
new_array = array.reshape(2, 3, 2)

print(new_array)

              
123456

            
import numpy as np

array  = np.array([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12])
new_array = array.reshape(2, 3, 2)

print(new_array)
copy
Aufgabe

Swipe to start coding

Consider the following array: [11, 56, 78, 45, 1, 5]. You should obtain the following array: [[11, 56], [78, 45], [1, 5]].

Please use the .reshape() method.

Lösung

import numpy as np

# 1. Creating an array
arr = np.array([11, 56, 78, 45, 1, 5])

# 2. Reshaping the array into [[11, 56], [78, 45], [1, 5]]
new_arr = arr.reshape(3, 2)

print(new_arr)

War alles klar?

Wie können wir es verbessern?

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Abschnitt 4. Kapitel 1
import numpy as np

# 1. Creating an array
arr = np.___([11, 56, 78, 45, 1, 5])

# 2. Reshaping the array into [[11, 56], [78, 45], [1, 5]]
new_arr = arr.___(___, ___)

print(new_arr)

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