MATLAB: Parfor Closed loop variable

closed loopparfor

Hi, Is it possible to have a closed loop model design which uses the initial value of inputs and later on the inputs are computed based on the output for further iterations, that is, the output is used again as the input for the next computation steps??

If yes, 1). Can it be implemented using parfor because my idea involves huge number of iterations consuming lot of time which I don't want to spend. 2). I tried using simin and simout for the input and output respectively. The model works in for loop but not in parfor:(. Can you suggest some other source and sink blocks for this implementation.

Thanks in Advance 🙂

Best Answer

You can use the parfor to parallelize computation in individual iterations, possibly reducing time per iteration. However, you cannot parallelize across iterations. The iterations lack the parallel independence assumed by PARFOR.

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MATLAB: Running Simulink model in a loop causes Windows memory issues

Adding close_system(model) and Simulink.sdi.clear after the code in each loop solved the problem.

for i = 1:numColsVin
    for j = 1:numColsRload
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            model = 'SimulinkModelv001';
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MATLAB: Best way to nest parfoor in for loops

There are a few things to consider -

 1. Is each loop iteration entirely independent of the prior ones? - If not, you can't turn it into a parfor unless you do really fancy stuff.
 2. Is there a better optimisation? - For example, don't recalculate stuff if you already have the answer. 
 3. How long does each loop take? If you do a loop twice, and the first time it's slow, but the second etc. are faster, then theres not necessarily much to be gained making it parallel. 
 4. What is the cause of the time taken? If it's disk accesses, then you'll probably struggle to make any gains unless the disk accesses are in the parfor. 
 5. How do the loops interact? - This might make it hard to put some loops in the parfor.

Best Answer

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MATLAB: Running Simulink model in a loop causes Windows memory issues

MATLAB: Best way to nest parfoor in for loops

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