trouble with finding sum in a for loop

I have a for loop that is supposed to find the sum of the vector. It works with most vectors except those with zeros, please help. the specific input i have trouble with is

an2 =   findSum([5 5 5 0 0])
function [sum] = findSum(vector)
sum = 0;
a = 1:20;
for i = vector
    sum = sum + a(i);
end
end

[Dyuman Joshi]

(Assuming it is necessary for you to use the for loop)

You want to calculate the sum of a vector, but why are you not using that vector or its elements for the operation?

Answer 1

[Matt J]

You should of course never do it this way.

an2 =   findSum([5 5 5 0 0])

an2 = 15

function result = findSum(vector
    result=0;    
    for v_i = vector
        result=result + v_i;
    end
    
end