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How to read To Workspace block signal value to App Designer ?

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AK
AK el 28 de Mzo. de 2024
Editada: AK el 1 de Abr. de 2024
Hi Everyone
I know I am asking the question for which answer exists somewhere , but I am new to app designer and I have simple requirement.
In mymodel.slx has "To Workspace1" output block.
In GUI callback to read model output , I am reading using get_param.
Signal1 = get_param('mymodel.slx/To Workspace1','VariableName');
As Signal1 is timeseries data. I want to extract last value to use further.
valueout1 = Signal1.Data(end,:); % Reads the value as last timestamp
At above line I am getting error as "Struct contents reference from a non-struct array object."
In command window code line valueout1 = Signal1.Data(end,:);
works as expected.
valueout1 is expected to get numeric value from 0-9. which I will use in switch case to displa\y some string in Text Box.
***********************
Request your inputs . I am trying to get simplest way to read model output and use it to display on App designer GUI.

Respuesta aceptada

Fangjun Jiang
Fangjun Jiang el 28 de Mzo. de 2024
Editada: Fangjun Jiang el 28 de Mzo. de 2024
Likely it is caused by this
Signal1 = get_param('mymodel.slx/To Workspace1','VariableName') gives you a char array containing the variable name, like
Signal1='MyOutput'.
In the base workspace, variable named 'MyOutput' does exist but you need to do
MyVariable=evalin('base',Signal1);
Then you can do, MyVariable.Data(end,:)
  4 comentarios
Fangjun Jiang
Fangjun Jiang el 29 de Mzo. de 2024
To Workspace data is written when the simulation is finished. To do what you want, see Block Run-Time Objects
AK
AK el 1 de Abr. de 2024
Editada: AK el 1 de Abr. de 2024
I was also exploring on same thing..I will take this approach. Thanks for your response.

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