I’ve not tried it myself, but you might try executing the following command at 
the top-level of your callback function:

persistent nsc_opt;

I have no idea if it will work.

   Ray



> On Jun 13, 2016, at 12:22 PM, Constantinos Heracleous <[email protected]> 
> wrote:
> 
> Hello,
> I’m trying to run matpower from simulink using a function call-back but I’m 
> getting "PERSISTENT declarations may only appear at the top-level.” error in  
> function mpoption line 551.
> Has anyone run matpower from simulink? or can you suggest something to try to 
> fix the issue.
> Thank you,
> Constantinos
> Begin forwarded message:
> 
> 
> 

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