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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
Task

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

Switch to desktopSwitch to desktop for real-world practiceContinue from where you are using one of the options below
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SectionΒ 4. ChapterΒ 3
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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
Task

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

Switch to desktopSwitch to desktop for real-world practiceContinue from where you are using one of the options below
Everything was clear?

How can we improve it?

Thanks for your feedback!

SectionΒ 4. ChapterΒ 3
single

single

close

Awesome!

Completion rate improved to 4.76

bookJoining

Swipe to show menu

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
Task

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

Switch to desktopSwitch to desktop for real-world practiceContinue from where you are using one of the options below
Everything was clear?

How can we improve it?

Thanks for your feedback!

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