Find max number in array python

Contents

• Introduction
• Syntax
• Example 1: Get Maximum Value of Numpy Array
• Example 2: Find Max value of Numpy Array with Float Values
• Summary

Given a numpy array, you can find the maximum value of all the elements in the array.

To get the maximum value of a Numpy Array, you can use numpy function numpy.max() function.

Syntax

The syntax of max() function as given below.

max_value = numpy.max(arr)

Pass the numpy array as argument to numpy.max(), and this function shall return the maximum value.

Example 1: Get Maximum Value of Numpy Array

In this example, we will take a numpy array with random numbers and then find the maximum of the array using numpy.max() function.

Python Program

import numpy as np

arr = np.random.randint(10, size=(4,5))
print(arr)
#find maximum value
max_value = np.max(arr)
print('Maximum value of the array is',max_value)

Run

Output

[[3 2 2 2 2]
 [5 7 0 4 5]
 [8 1 4 8 4]
 [2 0 7 2 1]]
Maximum value of the array is 8

Example 2: Find Max value of Numpy Array with Float Values

In the following example, we will take a numpy array with random float values and then find the maximum of the array using max() function.

Python Program

import numpy as np

arr = np.random.rand(6).reshape(2,3)
print(arr)
#find maximum value
max_value = np.max(arr)
print('Maximum value of the array is',max_value)

Run

Output

[[0.79794919 0.8307877  0.83587084]
 [0.44121629 0.69983604 0.30791677]]
Maximum value of the array is 0.8358708362776799

Summary

In this Numpy Tutorial of Python Examples, we learned how to find the maximum value of Numpy Array using max() built-in function, with the help of well detailed examples.

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Given an array, find the largest element in it.

Input : arr[] = {10, 20, 4}
Output : 20

Input : arr[] = {20, 10, 20, 4, 100}
Output : 100

Approach 1:

Python3

def largest(arr, n):

    max = arr[0]

    for i in range(1, n):

        if arr[i] > max:

            max = arr[i]

    return max

arr = [10, 324, 45, 90, 9808]

n = len(arr)

Ans = largest(arr, n)

print("Largest in given array ", Ans)

Output

Largest in given array  9808

Time Complexity: O(N)
Auxiliary Space: O(1)

Approach 2 (Using built-in function max()):

Here we will use the inbuilt method max() to find the maximum of the array. Below is the implementation of the approach.

Python3

def largest(arr, n):

    ans = max(arr)

    return ans;

if __name__ == '__main__':

    arr = [10, 324, 45, 90, 9808]

    n = len(arr)

    print ("Largest in given array ", largest(arr, n))

Output

Largest in given array  9808

Approach 3 (Using sort() function):

Here we use the sort() function to sort the array. The largest element will be the last element of the sorted array. Below is the implementation of the approach.

Python3

def largest(arr, n):

    arr.sort()

    return arr[n-1]

arr = [10, 324, 45, 90, 9808]

n = len(arr)

Ans = largest(arr, n)

print("Largest in given array ", Ans)

Output

Largest in given array  9808

Please refer complete article on Program to find largest element in an array for more details!