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.
