How to remedy the error for accessing an Index, but the index is out of bounds?

Hi,

I am receiving the following error when I run the loop below. Any ideas on how to remedy this error?

Attempted to access stocks.Open(17); index out of bounds because numel(stocks.Open)=16.

Error in mopso (line 22)
        stocks(i).ror(j) = (stocks(i).Open(j+1) - stocks(i).Open(j))/stocks(i).Open(j);

My for loop:

for i=1:length(stocks)
    stocks(i).ror = zeros(num_period, 1); % Rate of return of stocks i

      % Calculate all rate of return of stock i

      for j=1:num_period
          % Rate of returns
          stocks(i).ror(j) = (stocks(i).Open(j+1) - stocks(i).Open(j))/stocks(i).Open(j);
      end
      rors(:,i) = stocks(i).ror;
  end

Answer 1

[Adam]

You created your object to have size num_period, then you loop around from j = 1:num_period, but you use j+1 to index into your structure so when j reaches num_period this will go out of bounds.

I don't know enough about what your code is doing to know how to fix it correctly, but to avoid the error don't try to access the +1 element when looping up to the maximum size of the array.