How to achieve i+1 indexing in simulink

I'm very confused on how to achieve the (i+1) indexing in Simulink. Below is the matlab script that I want to implement. Any help is appreciated!

n_iter = 5;

Z = [1 1 0 0 0];

T1 = ones(n_iter, 1).*300;

T2 = ones(n_iter, 1).*300;

S = 5;

W = 5;

for i = 1:(n_iter-1)

S = S * 10;

if Z(i+1) == 0

S = S * 2;

else

S = S;

end

W = W * 5;

if Z(i+1) == 0

W = W * 5.5;

else

W = W;

end

T1(i+1) = T1(i) + S;

T2(i+1) = T2(i) + W + T1(i+1);

end

[Daniel Bengtson]

Hi Hui,

Could you just shift your indexing such that you use i-1 and i instead? Its much more trivial to add a delay on a variable in simulink than read a future value.

n_iter = 5;
Z = [1 1 0 0 0];
T1 = ones(n_iter, 1).*300;
T2 = ones(n_iter, 1).*300;
S = 5;
W = 5;
for i = 2:(n_iter)
    S = S * 10;
    if Z(i) == 0
        S = S * 2;
    else
        S = S;
    end
    W = W * 5;
    if Z(i) == 0
        W = W * 5.5;
    else
        W = W;
    end
    T1(i) = T1(i-1) + S;
    T2(i) = T2(i-1) + W + T1(i);
end

Answer 1

[Kshittiz]

Hi Hui,

I understand you are facing issues while trying to achieve the ‘i+1’ indexing from your MATLAB script in Simulink.

To achieve the (i+1) indexing in Simulink, you can use the ‘memory’ block to store the previous values of variables.

To learn more about the ‘memory’ block, refer the following documentation: https://in.mathworks.com/help/simulink/slref/memory.html

I hope this will help you in fixing the issue.

Regards,

Kshittiz