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How to update programmatically a parameter value in a referenced masked model?

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I have a masked model (let's call it sensor_mdl). Parameters were created in the model workspace as Matlab variables, and set as Arguments. The parameters in the mask refer to the corresponding parameters in the model workspace.
I added this model as a referenced model in another model, called sensor_top, which can contain one or more instances of sensor_mdl.
I am trying to update programmatically the values used for sensor_mdl in sensor_top.
I use the commands:
load_system('sensor_top')
objMask = Simulink.Mask.get('sensor_top/Model');
objMaskParameters = objMask.Parameters;
parameter1 = objMaskParameters(1);
parameter1.set('Value', 1);
But I get the error message:
"Unable to modify the mask of block 'MTM_top/Model'. Modify the referenced model's mask definition instead."
Any idea why and how to fix this?

Accepted Answer

Stefanie Schwarz
Stefanie Schwarz on 29 Nov 2019
Hi Nicolas,
editing the Mask object is not the correct workflow. Just use set_param:
set_param('sensor_top/Model','ParamName','1');
HTH,
Stefanie
  1 Comment
Nicolas Oriol
Nicolas Oriol on 2 Dec 2019
Thank you for your answer Stefanie. It does work!
Strange that one has to specify the parameter value as a string though.

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