Is it possible to program nested functions in a Simulink user-defined function?

Hello

It is a question regarding the Simulink Toolbox.

Is it somehow possible to build up a nested function structure as following example shows in just ONE Simulink user-defined function? With consideration of using no “Interpreted MATLAB functions”-blocks, which are slowing down the simulation. Hence with use of just built-in blocks like the Matlab Function Block or a S-Function Block. It is important to me just to use blocks which are not slowing down my simulation.

Best greetings Lukas

Example:

function y0 = AnyUserDefinedSimulinkFunction(x0) 

    function y1 = func1(u1)
     y1=func2(u1);
    end

    function y2 = func2(u2)
     y2=2*u2;
    end

y0=func1(x0)
end

Answer 1

[Kaustubha Govind]

Nested functions are not supported for code-generation, so you can't use them inside a MATLAB Function block, but I think this should work with Level-2 MATLAB S-functions.

[Tien-Sang Nguyen]

Can you explain clearly for me the way to work with level-2 MATLAB S-function?