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How to put forward and backward iterations in embedded m-func block?

How to put forward and backward iterations in embedded m-func block?

How to put forward and backward iterations in embedded m-func block?


  I'm having a m-function code, and it works perfectly when I have some workspace variables. However, it never works if i put these r,N,N1 and P as inputs to an embedded matlab function. I guess the problem is due to the clock, since m-file can have a "for x,-1,y" backward iteration loop as well as a forward loop in a same file, but Simulink clock is only forward going. So how can I actually realize the following calculation within Simulink? Please give an advice, thank you.

function [x] = abc(r,N,N1,P)






    for t=1:(N-mod(N,N1))/N1

        for k=t*N1:-1:(t-1)*N1+1
         for k=(t-1)*N1+1:t*N1;


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