Python Program to Sort Array in Descending Order

Write a Python Program to sort Numpy Array items in Descending order. First, the Numpy sort function (orarr.sort()) sorts the array items in ascending order. Next, we sliced the array using negative values to reverse the array (descarr = orarr[::-1]), which becomes descending.

# Sort Array Descending

import numpy as np

orarr = np.array([22, 98, 77, 88, 35, 15, 122, 91])
print("***Sorting Numpy Array in Descending Order***")
print("Original Array             = ", orarr)

orarr.sort()
descarr = orarr[::-1]
print("Array in Descending Order  = ", descarr)

Sort Numpy Array items in Descending order output.

***Sorting Numpy Array in Descending Order***
Original Array             =  [ 22  98  77  88  35  15 122  91]
Array in Descending Order  =  [122  98  91  88  77  35  22  15]

This program uses the NumPy module’s built-in sort() and flip() methods. Here, the sort() method sorts the array in ascending order, and the flip() method reverses it. Finally, we get the sorted array in descending order. Refer to Python sort.

import numpy as np
a = np.array([22, 98, 77, 88, 35, 15, 122, 91])
b = np.flip(np.sort(a))
print(b)
[122  98  91  88  77  35  22  15]

Python Program to Sort Array in Descending Order using the For Loop

In this example, we used the Nested for loop range to sort the numpy array items in Descending order. Within the loop, the if statement (if (dearr[i] < dearr[j])) checks each item is less than other array items and assigns them to the temp variable. Refer to Python array.

# Sort Array Descending

import numpy as np

dearr = np.array([11, 46, 22, 89, 77, 98, 55, 181, 65])
print("***Sorting Numpy Array in Descending Order***")
print("Original Array             = ", dearr)

length = len(dearr)

for i in range(length):
    for j in range(i + 1, length):
        if (dearr[i] < dearr[j]):
            temp = dearr[i]
            dearr[i] = dearr[j]
            dearr[j] = temp
            
print("Array in Descending Order  = ", dearr)

Sort Numpy Array items in Descending order using a for loop output. For more examples, refer to the Python Basic Programs.

***Sorting Numpy Array in Descending Order***
Original Array             =  [ 11  46  22  89  77  98  55 181  65]
Array in Descending Order  =  [181  98  89  77  65  55  46  22  11]

In this NumPy array example, we created a function (arrayDescending(dearr)) that sorts the array elements in descending order.

# Sort Array Descending

import numpy as np

def arrayDescending(dearr):
    for i in range(len(dearr)):
        for j in range(i + 1, len(dearr)):
            if (dearr[i] < dearr[j]):
                temp = dearr[i]
                dearr[i] = dearr[j]
                dearr[j] = temp
    
dearr = np.array([64, 36, 77, 55, 88, 95, 44, 91, 21])
print("***Sorting Numpy Array in Descending Order***")
print("Original Array             = ", dearr)

arrayDescending(dearr)
print("Array in Descending Order  = ", dearr)
Program to Sort Array in Descending Order

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