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Persistent data structures inside of M-file S-function

Persistent data structures inside of M-file S-function

Persistent data structures inside of M-file S-function

Is there any way to allocate an arbitrary data structures (such as buffers, structures, etc) inside of an M-file S-function and save references to them using some kind of PWork vectors?

I know it is simple in C language, but we need to use a number of complex data structures in M-file S-function. I am sure it is not possible using Level-1 S-function. What about Level-2?

It is not convenient to use global variables (do they survive between simulation steps?) or to pack all data into usual real state vectors.

Any suggesstions?
Thank you in advance!

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