Can I put an anonymous function into a Simulink block

Question

Justin 2016-12-20

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/317600-can-i-put-an-anonymous-function-into-a-simulink-block

回答： Mandar Patwardhan 2016-12-22

Although pretty good with Matlab, I’m a total amateur with Simulink so hoping someone can help.

I have a Matlab function y = fun1(x,M) that I want to put into a Simulink block (and later create an S-function version). x will come from another block in the Simulink model. M is a structure with a lot of information; it doesn’t change and I want to embed it in the Simulink block. I don’t want the block to have to load M from a matfile or call additional functions each time.

So, I thought to create an anonymous function as follows: anon_fun = @(x)fun1(x,M);

And then put the anon_fun in a Matlab Function, fcn or similar Simulink block. But none of these seem to work!

Is it possible to embed an anonymous function in a Simulink block, which type, and will I be able to generate an S-function from it?

Thanks in advance for any tips.

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Answer 1

Mandar Patwardhan 2016-12-22

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/317600-can-i-put-an-anonymous-function-into-a-simulink-block#answer_248233

If your use case is to create S-function, then refer to the following link which discusses the detailed steps to create a Level 2 MATLAB S-function. https://www.mathworks.com/help/simulink/sfg/writing-level-2-matlab-s-functions.html#brgtux6

You can create an S-function block, as shown in the example, add it in your model and provide a signal representing x as an input to this block.

If you do not intend to change the structure represented by M, then you can use a persistent variable and directly use it inside an S-function. There is no need to pass M as a parameter in that case because you will always have access to M inside the function. For information regarding persistent variables refer to the following link. https://www.mathworks.com/help/matlab/ref/persistent.html Additionally, it is not clear why would you use Anonymous functions inside a MATLAB function block. The use case which you are discussing can be definitely achievable using a Level-2 MATLAB S-function.