problem with yalmip in simulink

[Ali Ah]

Hi

Dear Prof.Johan Löfberg , i have a problem with Deepc simulation using yalmip in simulink.

it keeps solving more than once at each sampling time(Ts = 0.1) and so it takes a very long time(solver is called a 1000 times at 1 sampling time).

i'd very much appreciate it , if you could guide me with this problem.

i also use the line 

set_param(gcb,'SampleTime','0.1');

before simulation in simulink.

run data collection file first ,run the simple line of code above and then open and run the simulink file

[Johan Löfberg]

Have you read this first https://yalmip.github.io/example/simulink/

[Ali Ah]

yes i have read the link , i tried to follow it's instructions (especially the last one about the persistent optimizer) , i have checked the solver and it does solve manually with no errors . the problem is that it solves more than once at a sampling time

[Johan Löfberg]

I think it is that you have an algebraic loop in the model, so simulink will solve the nonlinear system of equations at every sample instant, which thus means evaluating the function until it is solved. You will have to get rid of this algebraic loop

[Ali Ah]

Hi

Dear Prof.Johan Löfberg thank you so much for providing me with this answer , i deleted the algebraic loop and instead recorded the controller output inside the controller (persistent)

and checked it and it's working beautifully . your guess was correct!