How to do a summation with a for loop

Hey all, this is the problem given to me, and this is the code I have written.

(a = 1:5

for a = a

a = a^3 + a^2 + a;

disp(sum(a)) ;

end)

However, it displays

(a =

1 2 3 4 5

3

14

39

84

155)

The code sets a = 155, but I want a = 295, the sum of (3, 14, 39, 84, 155). How would i go about doing so?

Answer 1

[Dyuman Joshi]

You are over-writing the variable a -

a = 1:5;

%Initiate a variable as 0 to store the sum
s = 0;

%loop over a, using another variable as the index of for loop
for k = a
    %Update sum for every value of a
    s = s + (k^3 + k^2 + k);
end
disp(s)

   295