How to insert a function handle in simulink !?

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Suppenhuhn 2011-3-10

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Hi,

I wrote a function f(x)=a*x(1)+b*x(2) in Matlab (without Simulink) as an .m-file and let ga(@function,2) calculate an optimum for given a,b. My next step is to insert that situation into Simulink - so, that a closed loop delivers different a,b with every step. How can I now implement my genetic algorithm (ga(@function,2)) ?

I actually wrote the function as s-function (with two inputs for a,b). Do I maybe have to write an Block Property/Callback with the command ga(@function,2) or how can I place my gen. algo. !?

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Answer 1

Guy Rouleau 2011-3-11

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In a Level 2 MATLAB S-function, you should be able to use your function in the same way as you do in MATLAB.

Do you receive any error?

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Answer 2

Suppenhuhn 2011-3-11

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Well - it doesn´t work !? I´m just a bit confused how to insert the order, that I (from pure Matlab) would enter from Workspace. In my Matlab-version I just write evalfis([5 7],[fisdata]) in my .m-function and the optimal Minimum for my function (f(x)=a*x(1)+b*x(2)) is getting calculated by writing ga(@function,2)(for given a,b (=5,7)). But I don´t know how to insert the ga-command in a Simulink-loop, where a and b are getting constantly changed. As I didn´t know better, I wrote a "Letsgo.m"-file with ga(@function, 2) and for my s-function I added a Callback in Block Properties/OpenFcn with the command set_param('Letsgo').

The resulting error is: "Error evaluating registered method 'Outputs' of M-S-Function 'testi_s' in 'Trink_s/Level-2 M-file S-Function'. The following error occurred converting from double to opaque: Error using ==> horzcat Undefined function or method 'opaque' for input arguments of type 'double'. The following is the MATLAB call stack (file names and line numbers) that produced this error: ['C:\...\...\...\testi_s.m'] [126]"

Line 126 is the first line in my s_function that has the parameter a or b !?