persistent variables are reinitialized ?

Dear all, I have a system which contains many subsystems each of them has a Matlab function block with its own persistent variables I display the variables during the run which usually takes hours, what I found that after a certain point all the persistent variables are reinitialized to its starting values! I do not know why?

I was looking for a solution I found that I should use mlock but it does not work in the matlab function block!, I added

coder.extrinsic('mlock');
mlock();

but I am getting this error

Call to MATLAB function aborted: "MLOCK" must be called from a file.
Component: Stateflow | Category: N.A.

Could you please help me solving this issue. Thank you,

Answer 1

[Walter Roberson]

Generally speaking, persistent variables are reinitialized if the function they are in is ever cleared, either by way of an explicit

clear TheFunctionName

or by a

clear all

There may be some situations in Simulink or SimScape that I am not familiar with in which a clear is done. (For example it would not startle me if disabling a block or subsystem had that result.)

Please check your blocks for "clear" statements. If you find any "clear all" then you should definitely remove those statements.