Write a Sigma equation-CodePudding

I have an equation and want to sum it's results with different values. I enter a number using Number = input() and the equation takes numbers from the input according to an index. The wanted indices are from i = 1 to i = 4. The equation is : Number[i] Number[i 1]*3 i

So for example, if my input is Number = 879463, then firstly for i = 1 : Number[1] Number[2]*3 1, which equals to 8 7*3 1 = 30

Then for i = 2 : Number[2] Number[3]*3 2 .. and so on, until i = 4. At the end, sum the results and store in total.

Here is my code:

Number = input()

total = 0

def equation(i,Number):
    x = (Number[i]   Number[i 1]*3   i)
    return x

for i in range(len(Number)):
    total  = equation(i,Number)
    
print(total)

For this code I get the error:

IndexError: string index out of range

Am I even in the right direction here ?

CodePudding user response：

# input is a string

number = input("Enter a number: ")

#  Two lists to store values, results and list of numbers

list_of_numbers = []
total = []

# List to store string values to integers

for i in number:
    list_of_numbers.append(int(i))
print(f'List = {list_of_numbers}')

# List to store values to total

for i in range(1, len(list_of_numbers)):
    result_equation = list_of_numbers[i - 1]   list_of_numbers[i] * 3   i

    print(f'For i = {i},  {list_of_numbers[i - 1]}   {list_of_numbers[i]}*3   {i} = {result_equation}')
    total.append(result_equation)

# Sum values
print(f'Total = {sum(total)}')

# Observation: Most of this code can  be erased as it is only used to print values on the screen.