Matlab Simulink without matlab function access

I try to alter the properties of a MatlabFunction on Simulink. The recommended commands are below.

open_system('my_model');

S = sfroot

B = S.find('Name','myBlockName','-isa','Stateflow.EMChart');

The 'BlockName' is a MatlabFunction on the model 'my_model'. The content of B is '0×1 empty handle' and S.Name gives 'DefaultBlockDiagram'. It seems it does not recognize the opened model. Could you help me somehow?

Best regards, Bruno Peixoto

Answer 1

[Rajanya]

Hi @Bruno Peixoto,

I recommend to double check the name of the MATLAB function block before executing the 'find' function using:

blockPath = find_system('my_model')

Sometimes, in versions earlier than R2020a, pressing 'Enter' after typing the name of a block actually adds a newline character to the name of the block, or there might also be spaces after the name for which the 'find' function might fail to find the block.

A safer way to do the same thing would be to use 'get_param' with block handles. For example, consider a demo model 'model2' containing the following:

%blockPath = 4×1 cell array
%{'model2'            }
%{'model2/Constant'   }
%{'model2/Display'    }
%{'model2/myBlockName'}

We can get the handle to the desired block and use 'find', instead of using it on 'sfroot'.

blockHandle = get_param(blockPath{4}, 'Handle'); %get blockPath using find_system
B = find(get_param(blockHandle, 'Object'), '-isa', 'Stateflow.EMChart');

This results in the expected 1x1 'EMChart' object to be stored in B.

Hope this would help. Thanks!