29 Mar Split Numpy Array
Split means to break/ slash an array into multiple arrays. To split an array, use the array_split() method. The following is the syntax:
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array_split(arr_name, split_num) |
Here, arr_name is the name of the array, split_num is the count of splits.
In this lesson, we will learn how to,
- Split a 1D array
- Access a split 1D array
- Split a 2D array and how to access
Split a 1D array
As shown above, to split an array in Numpy, we use the array_split() method. Herein, we will split a 1D array. Let us see an example of splitting a 1D array:
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import numpy as np # Create a Numpy array n = np.array([10, 20, 30, 40, 50, 60]) print("Iterating array...") for a in n: print(a) # splitting array into 2 resarr = np.array_split(n, 2) print("\nArray after splitting i.e. returns 2 arrays"); for a in resarr: print(a) |
Output
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Iterating array... 10 20 30 40 50 60 Array after splitting i.e. returns 2 arrays [10 20 30] [40 50 60] |
Access a split 1D array
To access a split One-Dimensional array, use the index number for the array element you want to display. Let us see an example to learn how to access a splitter 1D array:
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import numpy as np n = np.array([10, 20, 30, 40, 50, 60]) print("Iterating array...") for a in n: print(a) # splitting into 2 resarr = np.array_split(n, 2) print("\nArray after splitting i.e. returns 2 arrays"); print(resarr) print("\nAccess splitted array individually..."); print("Array1 = ",resarr[0]) print("Array2 = ",resarr[1]) |
Output
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Iterating array... 10 20 30 40 50 60 Array after splitting i.e. returns 2 arrays [array([10, 20, 30]), array([40, 50, 60])] Access splitted array individually... Array1 = [10 20 30] Array2 = [40 50 60] |
Split a 2D array and access
The split result will be a 2D array, for example, if a 2D array is split into two, there will be two 2D arrays as a result. Let us see an example of splitting a 2D array:
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import numpy as np n = np.array([[1,3,5],[4,8,12]]) print("Iterating array...") for a in n: print(a) # splitting into 2 resarr = np.array_split(n, 2) print("\nArray after splitting (returns 2 arrays)"); print(resarr) print("\nAccess splitted array individually..."); print("Array1 = ",resarr[0]) print("Array2 = ",resarr[1]) |
Output
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Iterating array... [1 3 5] [ 4 8 12] Array after splitting (returns 2 arrays) [array([[1, 3, 5]]), array([[ 4, 8, 12]])] Access splitted array individually... Array1 = [[1 3 5]] Array2 = [[ 4 8 12]] |
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