Python NumPy Split + 11 Examples

In this Python tutorial, we will learn how to split the NumPy array in Python. Also, we will cover these topics.

• Python NumPy split 2d array
• Python NumPy split string
• Python NumPy split columns
• Python NumPy split row
• Python NumPy split function
• Python split numpy array by value
• Python numpy random split
• Python numpy divide element wise
• Python numpy split array into chunks
• Python numpy.ndarray object has no attribute ‘split’
• Python np.log divide by zero

Python NumPy split

• In this Program, we will discuss how to split NumPy array in Python.
• Here we can use the split() function for splitting the input string or integers. In Python, the split() function is used to split the array into different shapes and this method always returns a list of substrings after splitting the given string.
• This method takes three parameters and the array must be divided into N equal arrays.

Syntax:

Here is the syntax of numpy.split() function

Numpy.split
           (
            ary,
            indices_or_sections,
            axis=0
           )

• It consists of a few parameters
  • ary: This parameter specifies the array that we want to split.
  • indices_or_sections: This parameter can be an integer and in this case, if the array is not possible to break then it will raise an error and if the value of indices is a one-dimensional integer then the array is splitting as per the given integer.
  • axis: By default, its value is 0 and the axis along which to be split.

Example:

Let’s take an example and check how to split the array in Python.

Source Code:

import numpy as np

arr1 = np.array([3,8,15,27,15,23,15,26,11,13])
b = np.split(arr1, 5)
print("split array",b)

In the above code first, we have created a numpy one-dimensional array and then we want to split the array into 5 different parts by using the np.split() method we can solve this problem. Once you will print ‘b’ then the output will display sub-parts of the array.

Here is the implementation of the following given code

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How to split Numpy array in Python

In this example, we will use the np.split() method on a NumPy array of strings. By using the split() we can easily break the array into four equal parts.

Source Code:

import numpy as np

arr1 = np.array(['Germany', 'Australia', 'China','Japan']) 
new_result= np.split(arr1,4)
print("array split:",new_result)

Here is the Screenshot of the following given code

This is how to split the NumPy array in Python.

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Python NumPy split 2d array

• In this section, we will discuss how to split numpy two-dimensional array in Python.
• Here we can use the split() method for splitting the 2-dimensional array either row-wise or column-wise. In this example, we have created a simple numpy array and now we want to break the 2-d array by using np.split().

Example:

import numpy as np

new_arr = np.array([[34,12,31,75],

                [14,17,18,93],

                [17,21,43,88]])
b = np.split(new_arr,3)
print(b)

You can refer to the below Screenshot

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How to split a 2-dimensional array in Python

By using the random() function we have generated an array ‘arr1’ and used the np.hsplit() method for splitting the NumPy array.

In Python, this method is used to divide an array into multiple subarrays column-wise along with we have applied the np.vsplit() method for splitting the row elements.

Syntax:

Here is the Syntax of numpy.hsplit() method

numpy.hsplit
            (
             ary,
             indices_or_sections
            )

Syntax of vsplit() method

numpy.vsplit
            (
             ary,
             indices_or_section
            )

Source Code:

import numpy as np

arr1 = np.random.randint(2, 10, size=(9,9))
new_result = [np.hsplit(i, 3) for i in np.vsplit(arr1,3)]

print(new_result)

In the above code, we have used the combination of the hsplit() and vsplit() method for splitting the 2- dimensional array.

Here is the Output of the following given code

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Python NumPy split string

• Let us see how to split NumPy string by using Python.
• In this example, we will use the np.split() method on a numpy array of strings. To do this task first we will import a numpy library and then create an array by using np.array in which we take the value of the string to it. Now declare a variable ‘final_res’ and assign the np.split() method for splitting the array into sub-arrays.

Example:

import numpy as np

new_array = np.array(['John', 'Micheal', 'William','George','oliva']) 
final_res= np.split(new_array,5)
print("array split:",final_res)

Here is the execution of the following given code

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Python NumPy split columns

• In this section, we will discuss how to split columns in NumPy array by using Python.
• In this example, we are going to use the concept array transpose. In Python, the transpose matrix is moving the elements of the row to the column and the column items to the rows. In simple word, it will reverse the values in an array.

Syntax:

Here is the Syntax of array transpose

ndarray.T

Example:

import numpy as np

new_output = np.array([[63,13,15],[18,27,18],[14,94,55]])
col1, col2, col3 = new_output.T
print(col1)
print(col2)
print(col3)

In the above code, we have created an array and declared variables named ‘col1′, ‘col2’, ‘col3’ in which we have assigned the array transpose arr.T. Once you will print ‘col1’, ‘col2’, ‘col3’ then the output will display the split elements.

You can refer to the below Screenshot

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How to split column-wise in NumPy array

This is another approach to split the column-wise element in an array by using the np.hsplit() method. In Python, this method is used to divide an array into multiple subarrays column-wise.

Source Code:

import numpy as np 

new_arr2 = np.array([[23,21,15],[9,5,18],[80,90,55]])
result = np.hsplit(new_arr2,3) 
print("Column-wise splitting:",result)

Here is the Screenshot of the following given code

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Python NumPy split row

• In this Program, we will discuss how to split row elements by using Python.
• To perform this particular task we are going to use the np.vsplit() method for breaking the row elements in a given array. In Python, this method is used to split an array into different sub-arrays vertically and by default it takes axis=0 but we are not going to mention this parameter in the program.

Syntax:

Here is the Syntax of numpy vsplit() method

numpy.vsplit
            (
             ary,
             indices_or_section
            )

Source Code:

import numpy as np 

new_array = np.array([[63,13,15],[18,27,18],[14,94,55]])
result = np.vsplit(new_array,3) 
print("Row-wise splitting:",result)

In the above program, we have just created a simple NumPy array by using the np.array() and assigning integer values to it. Now we want to split the elements vertically (row-wise) by using the np.split() method.

As you can see in the Screenshot the output has three different numpy array

• Valueerror: Setting an array element with a sequence

Python NumPy split function

• Here we can see how to split Python Numpy array by using the split() function.
• We have already used this method in every examples and this method is basically used for splitting or we cabn dividing the array into sub-arrays.

Syntax:

Here is the Syntax of the split() function

Numpy.split
           (
            ary,
            indices_or_sections,
            axis=0
           )

Example:

import numpy as np

new_val = np.array([17, 45, 32, 15, 18, 93])
result = np.split(new_val, 2)
print(result)

Here is the implementation of the following given code

As you can see in the above screenshot the output displays the array into two different parts

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Python split numpy array by value

• In this section, we will discuss how to split the numpy array based on value by using Python.
• In this example, we are going to use the concept of np.arange() function for creating an array. Now use the np.split() method for dividing the array depending on a given value.

Example:

import numpy as np

new_arr = np.arange(12).reshape(4,3)
z=np.array_split(new_arr, np.where(new_arr[:, 0]== 6)[0][0])
print(z)

Here is the output of the following given code

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Python numpy random split

• In this Program, we will discuss how to split the numpy random elements by using Python.
• To do this task we are goin to use the np.random.shuffle() method and this function will help the user to shuffle the arrays along the first given axis and it will modify the positions of items in a NumPy array and it always return None as it workplace.

Syntax:

Here is the Syntax of np.random.shuffle() method

random.shuffle(x)

Note: The x parameter indicates the changeable sequence.

Source Code:

import numpy

arr = numpy.random.rand(10, 3)
b = numpy.random.shuffle(arr)
m, n = arr[:70,:], arr[70:,:]
print(m, n)

In the above code, we used the np.arange() function for creating an array, and this function spaced values within the provided limit.

You can refer to the below Screenshot

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Python numpy divide element wise

• Here we can see how to divide Numpy array element-wise by using Python.
• In this example, we take two numpy arrays and we want to divide each item of the first numpy array with the second array. To do this task we can use the / operator and this operand is used for the division operator.

Source Code:

import numpy as np

val1 = np.array([50,55,66])
val2 = np.array([5,5,6])

new_result = val1/val2
print(new_result)

In the above code, we use the / operator and store the result inside the ‘new_result’. Once you will print ‘new_result’ then the output will display the division of val1 and val2.

Here is the execution of the following given code

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Python numpy split array into chunks

• In this section we will discuss how to split array into chunks by using Python.
• By using the split() function we can perform this particular task and split the array into three different sub-arrays.

Example:

import numpy as np

arr1 = np.array([5,6,7,8,9,23])
d = np.array_split(arr1, 3)
print(d)

Here is the Screenshot of the following given code

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Python numpy.ndarray object has no attribute ‘split’

• In this section, we will discuss the error display message ‘numpy.ndarray’ object has no attribute ‘split’.
• First, we have created a numpy array and then use np.ndarray.split() for splitting the array into sub-arrays but in this case, when we run this program the output will display the numpy has no attribute ‘split’.

Source Code:

import numpy as np

new_arr = np.arange(4)
output = np.ndarray_split(new_arr, 3)
print(output)

Screenshot:

Solution

To solve this problem we are going to use the np.split() function instead of the nd.array() for dividing the NumPy array.

import numpy as np

new_arr = np.arange(6)
output = np.split(new_arr, 3)
print(output)

• Python NumPy log

Python np.log divide by zero

• In this Program, we will discuss how to divide np.log by zero in Python.
• In this example we have used the np.log() function in which we assign the numpy array ‘arr1’. Now use the np.inf for dividing the given value with zero.

Example:

import numpy as np

arr1= np.random.randint(8,size=8)
ou_new = np.log(arr1)
ou_new[ou_new==-np.inf]=0
print(ou_new)

You can refer to the below Screenshot

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In this Python tutorial, we will learn how to split the NumPy array in Python. Also, we will cover these topics.

• Python NumPy split 2d array
• Python NumPy split string
• Python NumPy split columns
• Python NumPy split row
• Python NumPy split function
• Python split numpy array by value
• Python numpy random split
• Python numpy divide element wise
• Python numpy split array into chunks
• Python numpy.ndarray object has no attribute ‘split’
• Python np.log divide by zero