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How do I get the name of the signal if it is not in a structured array?

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Kyle
Kyle 2013-8-19
I am attempting to set the parameter of a bus selector to a specific signal in a masked sub system using
load_system('simulink');
set_param(gcb, 'MaskSelfModifiable', 'on');
ph = get_param([gcb,'/In1'],'PortHandles');
sh = get_param(ph.Outport, 'SignalHierarchy');
sc = sh.Children(sns,1).SignalName;
set_param([gcb,'/Bus'],'OutputSignals',sc);
sns is a user input to the masked block
The code above alters the contents of the masked subsytem by when I go to simulate the model I recieve 2 errors
Initialization commands cannot be evaluated.
and
Attempt to reference field of non-structure array.
How do I get the name of the signal if it is not in a structured array?

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