Embedded MATLAB function: Call global struct; Error: Referencing a component from array of non-scalar values is not supported for code generation.

Question

Andreas Kustermann 2017-5-18

1
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https://ww2.mathworks.cn/matlabcentral/answers/340818-embedded-matlab-function-call-global-struct-error-referencing-a-component-from-array-of-non-scala

编辑： Franck Yin 2017-5-29

Hello Everybody!

I'm trying to use a global struct variable defined via a Simulink.Bus + Simulink.Signal + MATLAB Value Initialisation struct (all fields = 0) in a Simulink Modell. I've successfully implemented the global struct variable, however as soon as I try to work with it in a Simulink-embedded MATLAB function I get the following Coder Error for every single code line where I want to access any field of my global struct:

"Referencing a component from array of non-scalar values is not supported for code generation."

My struct has the following field architecture:

Init_FMS.FM.Fly_BM              = false; 
Init_FMS.FM.Fly_FPL             = false; 
Init_FMS.FM.Fly_Manual          = false; 
Init_FMS.BM.Psi                 = single(0);
Init_FMS.BM.H                   = single(0);
Init_FMS.BM.H_dot               = single(0);
Init_FMS.BM.IAS                 = single(0);
Init_FMS.FPL.GEN.Name           = uint8(zeros(1,20));  
Init_FMS.FPL.GEN.Num_of_WPTs    = uint16(0);            
Init_FMS.FPL.WPT.ID             = uint16(zeros(maxNumWPTs,1));             
Init_FMS.FPL.WPT.LAT            = double(zeros(maxNumWPTs,1));
Init_FMS.FPL.WPT.LON            = double(zeros(maxNumWPTs,1));
Init_FMS.FPL.WPT.ALT            = single(zeros(maxNumWPTs,1));
Init_FMS.FPL.WPT.VEL            = single(zeros(maxNumWPTs,1));
Init_FMS.FPL.WPT.TRT            = uint8(zeros( maxNumWPTs,1));
Init_FMS.FPL.WPT.Loiter_ID      = uint16(zeros(maxNumWPTs,1));
Init_FMS.FPL.WPT.Loiter_Time    = int16(zeros( maxNumWPTs,1));

Within the embedded function I call it just like a normal global variable before trying to write new data to the different fields:

function = Receive_FMS_ProcessInternData (...)
global FMS
  if ...
      if ...
          FMS.FM.Fly_BM     = true;
...
end

and so on.

What am I doing wrong (code/ variable settings?) to avoid getting the coder error all the time?

Thank you!! :)

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Answer 1

Suhan 2017-5-23

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Hi,

The error "Referencing a component from array of non-scalar values is not supported for code generation" typically comes up with Structure Arrays when dot notation is used to access the elements. Structures are supported for code generation, so that should not be an issue: http://www.mathworks.com/help/simulink/ug/matlab-language-features-supported-for-code-generation.html. Also, see if specifying the data type of the bus structure of the inputs and outputs to the MATLAB function block in the Model Explorer fixes the issue

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Franck Yin 2017-5-29

编辑：Franck Yin 2017-5-29

What worked for me : I forgot that my element was an array. After adding the index -"element(1).subelement" instead of "element.subelement" in my case- the problem was gone.

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Answer 2

Andreas Kustermann 2017-5-24

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https://ww2.mathworks.cn/matlabcentral/answers/340818-embedded-matlab-function-call-global-struct-error-referencing-a-component-from-array-of-non-scala#answer_268176

Solved the problem, thank you. In the model explorer, for the respective settings of the Simulink.Signal its dimensions need to be set to "1" and "auto"; during my first setup I had specified the exact dimension size (= row number) of my global struct which was apparently wrong.