Hi, thanks for the quick reply!

I already tried this and unfortunately is not working.
is there any way to remove the persistent from nsc_opt? matlab is giving also a 
warning in the code saying "Line 551: PERSISTENT could be very inefficient 
unless it is a top-level statement in its function."

Constantinos.

> On 13 Jun 2016, at 11:35 PM, Ray Zimmerman <[email protected]> wrote:
> 
> 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] 
>> <mailto:[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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