MATLAB: Decimal increment inside a for loop

for loopintegersloopnon-integerpositive

Hi, I am trying to run a for loop as part of my code. I am trying to have 15 j values between z2 and z1 which are decimal numbers and change with every iteration. The error I am getting is "Subscript indices must either be real positive integers or logicals."I know I am getting the increments wrong but need some suggestions to solve the error.
    for i = 1:1:49
        X_even = [];
        C_even = [];
        P_even = [];
        z1 = S0 - 2 * std(S) * sqrt(T - dt);
        z2 = S0 + 2 * std(S) * sqrt(T - dt);
        z = (z2-z1);
        for j = z1:(z2-z1)/15:z2
            X_even = [X_even ; X1(j,i)];
            C_even = [C_even ; C1(j,i)];
            P_even = [P_even ; P1(j,i)];
        end
       X1_even = [X1_even X_even];
       C1_even = [C1_even C_even];
       P1_even = [P1_even P_even];
    end

Best Answer

You need to do something like this:
          vj = z1:(z2-z1)/15:z2;
          for j = 1:length(vj)
              X_even = [X_even ; X1(j,i)];
              C_even = [C_even ; C1(j,i)];
              P_even = [P_even ; P1(j,i)];
          end
If you are using ‘vj’ in calculations (although you do not seem to be in the code you posted), refer to fractional ‘j’ as ‘vj(j)’.
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