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S-function: propagation error.

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max
max on 27 Dec 2012
Closed: MATLAB Answer Bot on 20 Aug 2021
I've got a problem with S-function builder in simulink. I realized a complicated S-function, in input there are matrix with cond number very high. The results are wrong if the output is feed back for using at the next step. The error increase step by step, it starts at 10^-13 and it goes at 10^3.
How it's possible that? there are any propagation error?
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Kaustubha Govind
Kaustubha Govind on 27 Dec 2012
Do you use a Delay block in the feedback loop? This might be important if your S-function is a direct feedthrough block.

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