Index in position 2 exceeds array bounds (must not exceed 10)

Please help me debug this. I commented the line that Matlab says has error.

The error says this: Index in position 2 exceeds array bounds (must not exceed 10). I know it means my array does not match somehow but cant figure it out.

Any help is appreciated. Thanks!

    for i = 1:10
        if 1 == 10
            
            ttr = 2.6366*10^(-4) * k * (lambda_w (n,i) + lambda_o (n,i))* dydz / D;
            twr = 2.6366*10^(-4) * k * (lambda_w (n,i))* dydz / D;
            
            sw (n+1,i) = (1+ (cr+cw) * (po (n+1,i) - po (n,i))) * sw (n,i) + (t_step / (VR * phi)) * ...
                (-twr * (po(n+1,i) - po(n+1,i-1)) + twl * (pcow(n,i) - pcow(n,i-1)) + q(n,i));
          
        else
            ttl = ttr;
            twl = twr;
            ttr = 2.6366*10^(-4) * k * (lambda_w (n,i) + lambda_o (n,i))* dydz / D;
            twr = 2.6366*10^(-4) * k * (lambda_w (n,i))* dydz / D;
            
            sw (n+1,i) = (1+ (cr+cw) * (po(n+1,i) - po(n,i))) * sw (n,i) + (t_step / (VR * phi)) * ...
                (twr * (po(n+1,i+1) - po(n+1,i)) - twl * (po(n+1,i) - po(n+1,i-1)) - twr * (pcow(n,i+1) - pcow(n,i)) ...
                + twl * (pcow(n,i) - pcow(n,i-1))); %%%%%%%%%%%%%% this line is the problem %%%%%%%%%%%%%%%%%%%%%%%%%%%%
        end
    end
    

Answer 1

[KSSV]

YOu should not run loop i from 1 to 10. All your arrays are size 2*10 and you are using n+1 in the code....so for i = 10, the index becomes 11 and it throws error. Try running loop from i = 1:9.