How to update function's variables each sample time

I created a matlab function which implements DMC controller as shown , the problem is there are few vectors inside the function needs to get updated each sampling time , So is there a way to save data after each sampling time to be used for the next ones?

note: " save " function is not supported in simulink's code generation for some reason

Answer 1

[Fangjun Jiang]

Use persistent variables

Persistent