Question

Write a program that reads a sequence of integers into a NumPy array and that computes the alternating sum of all elements in the array. For example, if the program is executed with the input data 1,4, 9, 1 6, 9, 7, 4, 9, 11 then it cumputes 1-4+9-16+9-7+4-9+11=-2

Answer 1

A Python program with NumPy that calculates the alternating sum of an array was provided. The user inputs comma-separated integers, which are converted to a NumPy array.

The sums of elements at even and odd indices are then subtracted to find the result.

Step-by-step explanation:

Writing a program to compute the alternating sum of elements in a NumPy array involves reading integers, storing them in the array, and then performing the calculation. The solution can be implemented in Python with NumPy as follows:

import numpy as np

# Read input as string and then convert the string into a list of integers
arr = np.array(input('Enter numbers separated by commas: ').split(','), dtype=int)

# Compute the alternating sum
alternating_sum = np.sum(arr[::2]) - np.sum(arr[1::2])

print('The alternating sum is:', alternating_sum)

This program prompts the user to enter a series of numbers separated by commas. It then splits the input string, converts the pieces to integers, and creates a NumPy array. Finally, it computes the alternating sum by subtracting the sum of the elements at odd indices from the sum of the elements at even indices, and prints the result.