FOR iterator subsystem in Simulink

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Rukmani Mohanganesh 2013-7-7

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https://ww2.mathworks.cn/matlabcentral/answers/81312-for-iterator-subsystem-in-simulink

I have a simulink model which has to do the following: In1 input would take in a vector of 3 element input (this will be time varying but for initial development/testing purposes I have used a constant [1 3 6]) and In2 is a constant matrix of 6x3 size whose value is X =

     1     4     6
     1     4     5
     1     3     6
     0     0     0
     2     3     5
     3     5     7
The simulink model should output the corresponding index (1 based index) of [1 3 6] in X (which should be 3).
When I simulate this model I am able to see value '3' at every loop (10 ms loop) with a scope inside the FOR subsystem. But when I  
scope this output outside the FOR subsystem, it always displays '0' and never equal to '3'. I am not able understand this behavior.
Please help!