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NumPy in a Nutshell

bookJoining

Another equally important operation in array manipulation is joining arrays. Joining arrays involves combining multiple arrays into a single array that includes all the elements from each of the original arrays.

We perform this concatenation along the specified axes:

  • if axis = 0 (which is the default value), this implies concatenating the arrays by rows;
  • if axis = 1, this means concatenating the arrays by columns.

Join two arrays:


              
12345678

            
import numpy as np

array_1 = np.array([54, 6, 23, 1, 6])
array_2 = np.array([12, 67, 94, 2, 8 ])

array = np.concatenate((array_1, array_2))

print(array)
copy

Concatenate two 2-D arrays along columns (axis=1):


              
12345678

            
import numpy as np

array_1 = np.array([[0, 1, 2], [3, 4, 5]])
array_2 = np.array([[6, 7, 8], [9, 10, 11]])

array = np.concatenate((array_1, array_2), axis=1)

print(array)
copy

Concatenate two 2-D arrays along rows (default axis=0):


              
12345678

            
import numpy as np

array_1 = np.array([[0, 1, 2], [3, 4, 5]])
array_2 = np.array([[6, 7, 8], [9, 10, 11]])

array = np.concatenate((array_1, array_2))

print(array)
copy
Tâche

Swipe to start coding

You have two arrays:

  1. [[12, 56, 78], [35, 1, 5]];

  2. [[ 8, 65, 3], [ 1, 2, 3]].

You have to create the following combined array:

[[12 56 78  8 65  3]
 [35  1  5  1  2  3]]

Solution

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Comment pouvons-nous l'améliorer ?

Merci pour vos commentaires !

Section 4. Chapitre 3
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bookJoining

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Another equally important operation in array manipulation is joining arrays. Joining arrays involves combining multiple arrays into a single array that includes all the elements from each of the original arrays.

We perform this concatenation along the specified axes:

  • if axis = 0 (which is the default value), this implies concatenating the arrays by rows;
  • if axis = 1, this means concatenating the arrays by columns.

Join two arrays:


              
12345678

            
import numpy as np

array_1 = np.array([54, 6, 23, 1, 6])
array_2 = np.array([12, 67, 94, 2, 8 ])

array = np.concatenate((array_1, array_2))

print(array)
copy

Concatenate two 2-D arrays along columns (axis=1):


              
12345678

            
import numpy as np

array_1 = np.array([[0, 1, 2], [3, 4, 5]])
array_2 = np.array([[6, 7, 8], [9, 10, 11]])

array = np.concatenate((array_1, array_2), axis=1)

print(array)
copy

Concatenate two 2-D arrays along rows (default axis=0):


              
12345678

            
import numpy as np

array_1 = np.array([[0, 1, 2], [3, 4, 5]])
array_2 = np.array([[6, 7, 8], [9, 10, 11]])

array = np.concatenate((array_1, array_2))

print(array)
copy
Tâche

Swipe to start coding

You have two arrays:

  1. [[12, 56, 78], [35, 1, 5]];

  2. [[ 8, 65, 3], [ 1, 2, 3]].

You have to create the following combined array:

[[12 56 78  8 65  3]
 [35  1  5  1  2  3]]

Solution

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Tout était clair ?

Comment pouvons-nous l'améliorer ?

Merci pour vos commentaires !

close

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Completion rate improved to 4.76
Section 4. Chapitre 3
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