Hello! I have a homework: if v is [1 2 3 4 5 4 3 2 1] and n is 3, it will find 4 5 and 4 because their sum of 13 is the largest of any 3 consecutive elements of v. The function returns summa, the sum as the first output argument and index, the index of the first element of the n consecutive ones as the second output.
for example
- [summa, index] = max_sum([1 2 3 4 5 4 3 2 1],3)
- summa = 13
- index = 4
- [summa, index] = max_sum([1 2 3 4 5 4 3 2 1],1)
- summa = 5
- index = 5
- [summa, index] = max_sum([1 2 3 4 5 4 3 2 1],9)
- summa = 25
- index = 1
Then I have written the code. The summa Part is correct but the index part ist wrong. index is always equal to v(k-n+1). Could someone give me some idea?
Here is the result of my code:
- max_sum([1 2 3 4 5 4 3 2 1],1)
- summa =5
- index =1
function [summa,index] = max_sum(v,n)
k = length(v);
a = zeros(1,k-n+1);
if isscalar(n) == 1 && n > 0 && n == round(n)
if n <= k
for ii = 1:(k-n+1)
b = sum(v(ii:ii+(n-1)));
a(ii) = b;
summa = max(a);
end
index = v(ii);
else
summa = 0;
index = -1;
end
else
fprintf('wrong');
end
