How to pass vector variable in Simulink Bus?

Question

Karol P. 2023-11-1

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https://ww2.mathworks.cn/matlabcentral/answers/2041556-how-to-pass-vector-variable-in-simulink-bus

编辑： madhan ravi 2023-11-24

Hi! I'm looking for a method to pass vector variable as output of MATLAB Function block in Simulink. Let's say that I have a structure that I wan to pass and it contains only scalar variables:

var_struct=struct('A',A,'B',B,'C',C);

I set the Bus to hold three variables of type double and I can send it this way to other model blocks. But now Let's add one more variable, vector:

vecD=[1 2 3 4 5]
var_struct=struct('A',A,'B',B,'C',C,'vecD',vecD);

It will end with error:

Dimension 2 of field 'vecD' is fixed on the left-hand side but varies on the right ([1 x 1] ~= [1 x :?]).

Of course I can set it to variable size in bus (Type Editor), and set 2-dimmensonal but in this case I get the error:

Size mismatch error on dimension 2: expected 1, but actual size is 5

How to change the size expected by the bus?

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Answer 1

madhan ravi 2023-11-24

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https://ww2.mathworks.cn/matlabcentral/answers/2041556-how-to-pass-vector-variable-in-simulink-bus#answer_1358822

编辑：madhan ravi 2023-11-24

在 MATLAB Online 中打开

Create Bus Object:Inside the MATLAB Function block, define the bus object using the Simulink.Bus.createObject function. This should be done before you use it as an output.

function output = myFunction(input)
    % Create bus object
    busObject = Simulink.Bus.createObject(input);
      % Define fields for the bus object
    busObject.Elements(1).Name = 'A';
    busObject.Elements(2).Name = 'B';
    busObject.Elements(3).Name = 'C';
    busObject.Elements(4).Name = 'vecD';
    % Set vector size for variable-size signals
    busObject.Elements(4).Dimensions = [-1 1];
    % Create the bus signal
    output = busObject;

Update MATLAB Function:

%Continue with your processing code and assign values to the fields of the bus object.
% Your processing code here
    % Assign values to the bus object fields
    output.A = ...; % Your result for A
    output.B = ...; % Your result for B
    output.C = ...; % Your result for C
    output.vecD = ...; % Your result for vecDSet Bus Output:In the MATLAB Function block parameters, go to the "Output" tab.Set the "Output data type" to "Inherit: auto."Update Bus Usage in Model:Connect the bus object to your MATLAB Function block's output and other blocks in your model.