Python: Find the ration of positive numbers, negative numbers and zeroes in an array of integers

Last update on April 22 2025 12:52:45 (UTC/GMT +8 hours)

12. Ratio of Pos/Neg/Zero Map

Write a Python program to find the ratio of positive numbers, negative numbers and zeroes in an array of integers.

Total number of elements in the give array = n
Ratio:
Positive numbers (n1) : Negative numbers(n2) : Zeroes(n3)
= n1/n : n2/n : n3/n

Sample Solution:

Python Code :

# Import the 'array' class from the 'array' module
from array import array

# Define a function 'plusMinus' that takes a list of integers as input and returns the ratio of positive, negative, and zero numbers
def plusMinus(nums):
    # Get the length of the input list
    n = len(nums)
    # Initialize counters for positive, negative, and zero numbers
    n1 = n2 = n3 = 0
    
    # Iterate through each element in the list
    for x in nums:
        # Check if the element is positive, negative, or zero, and update the counters accordingly
        if x > 0:
            n1 += 1
        elif x < 0:
            n2 += 1
        else:
            n3 += 1
    
    # Return the ratio of positive, negative, and zero numbers, rounded to two decimal places
    return round(n1/n, 2), round(n2/n, 2), round(n3/n, 2)

# Create an array 'nums' of type 'i' (signed integer) with the specified elements
nums = array('i', [0, 1, 2, -1, -5, 6, 0, -3, -2, 3, 4, 6, 8])

# Print the original array 'nums'
print("Original array:", nums)

# Convert 'nums' to a list and store it in 'nums_arr'
nums_arr = list(map(int, nums))

# Call the 'plusMinus' function with 'nums_arr' as the argument and store the result in 'result'
result = plusMinus(nums_arr)

# Print the ratio of positive, negative, and zero numbers in the array
print("Ratio of positive numbers, negative numbers, and zeroes:")
print(result)

# Create another array 'nums' with different elements
nums = array('i', [2, 1, 2, -1, -5, 6, 4, -3, -2, 3, 4, 6, 8])

# Print the original array 'nums'
print("\nOriginal array:", nums)

# Convert 'nums' to a list and store it in 'nums_arr'
nums_arr = list(map(int, nums))

# Call the 'plusMinus' function with 'nums_arr' as the argument and store the result in 'result'
result = plusMinus(nums_arr)

# Print the ratio of positive, negative, and zero numbers in the array
print("Ratio of positive numbers, negative numbers, and zeroes:")
print(result)

Sample Output:

Original array: array('i', [0, 1, 2, -1, -5, 6, 0, -3, -2, 3, 4, 6, 8])
Ratio of positive numbers, negative numbers and zeroes:
(0.54, 0.31, 0.15)

Original array: array('i', [2, 1, 2, -1, -5, 6, 4, -3, -2, 3, 4, 6, 8])
Ratio of positive numbers, negative numbers and zeroes:
(0.69, 0.31, 0.0)

For more Practice: Solve these Related Problems:

• Write a Python program to map a function that classifies numbers as positive, negative, or zero and then compute the percentage of each category in an array.
• Write a Python program to use map to tag each element in an array as 'pos', 'neg', or 'zero', and then count the occurrences of each tag.
• Write a Python program to map a lambda that returns 1 for positive, -1 for negative, and 0 for zero, then calculate the ratio of these values in an array.
• Write a Python program to convert each number in an array to a tuple (number, category) using map and then determine the proportion of each category.

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• Python Map Exercises Home ↩
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