Use inputs of a user defined Matlab function block as global variables whithin the block

Question

Ali Baradaran 2017-6-21

1
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/345707-use-inputs-of-a-user-defined-matlab-function-block-as-global-variables-whithin-the-block

回答： Swarooph 2017-6-23

In my simulink model there is a Matlab function which consists of many functions:

function block_output = MatFun1(input1, input2, ...)
  ...
  block_output = MatFun2(x, t)
end
 function y = MatFun2(x, t)
    y = f(x, t, input1, input2, ...)
 end

Mathematically MatFun2 is just a function of x and t. Therefore, I would like to keep the notation intact. However, the function requires the block's inputs as well. I tried to globalize the variables input1, input2, ... to be able to use them in MatFun2 as well:

 function block_output = MatFun1(input1, input2, ...)
    global block_inputs
    block_inputs = [input1, input2, ...]
    ...
    block_output = MatFun2(x, t)
  end

However, I encounter the following error:

 Global declaration not resolved to a Data Store Memory block registered via the Ports and Data Manager.

As I mentioned, I do not want to pass input1, input2, ... to MatFun2 as arguments. Moreover, I want these variables to be known just within this block (not the whole simulink model). Nested functions are also not desirable. What options do I have and how can I resolve the problem?

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Swarooph 2017-6-23

ExampleModified.zip

Good news: I was able to make the error disappear. Please find the modified model attached. I declared a Data Store Memory called inputs in the Edit Data dialog of MATLAB function.

And I also put in a Data Store Memory block in the Simulink model referring to the same.

Running this model does not error anymore.

Not so good news: In my experience of using Simulink, it seems like you are trying to model something in MATLAB that is perhaps easier to just do in Simulink itself using other blocks.. Of course I don't have the big picture and maybe you have come to this design pattern after a lot of research. I am just guessing here. But the path you are set on doesn't seem very promising to me with MATLAB functions, global variables and such. Just my 2 cents.

Ali Baradaran 2017-6-23

编辑：Ali Baradaran 2017-6-23

Dear Swarooph,

Thanks for your reply. Since you have commented under my question (instead of answering it), I am not able to vote for it. But thanks again. Regarding your tip, I will reconsider my design.

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