How can I specify the output of a Matlab Function Block to be of a specific Bus type programatically?

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Chris Bogath 2016-10-6

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评论： Nikita Visnevski 2021-2-20

I have a matlab function block that has several inputs, and combines them into a structure that matches a Simulink bus object on the workspace. From the editor GUI, , clicking on the edit data button or through the explorer, I can set the output Data Type to be of Bus: MyBusType, rather than inherited. But, I need to be able to do this programmatically. Is there a way? If I get the PortHandles for the block, and then get_param the signal hierarchy for that port, I can see that I set it to the MyBusType, but this is a read only parameter so set_param can not work.

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Answer 1

Dimitris Iliou 2016-10-14

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If I understand correctly, you want to be able to change the output Datatype for the MATLAB Function Block programmatically instead doing it through the GUI.

In order to do that you need to work with the Stateflow API because the MATLAB Function Block uses it.

So what you would need to do is find the Stateflow root object, then the MATLAB Function Block, and finally locate and change the necessary output.

This can be done with the following snippet of code below:

% Find stateflow root object
rt = sfroot;
% Find the MATLAB Function block
A = rt.find('-isa','Stateflow.EMChart');
% Find the outputs
A.outputs;
% If you want to view the 1st output
A.outputs(1);
% Change the data type using the 'DataType' property
A.outputs(1).DataType = 'double';

If you have multiple MATLAB Function Blocks,‘A’ will be a struct and you would need to find the element that corresponds to the MATLAB Function Block you want to change. Also, A.outputs contains all the outputs of the specific block so you would also need to locate the correct output to edit.

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Chris Bogath 2016-10-15

Thank you! I was already using the Stateflow API to set the script, just didn't realise the outputs DataType property. Works perfectly.

Nikita Visnevski 2021-2-20

Is Stateflow license required to perform this? I cannot tell easily as I have Stateflow license, but I am writing code that others without Stateflow license may need to execute.

If Stateflow license is required, does anyone know of a way to do the same action without relying on Stateflow API?

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