I am using dialog callbacks to validate data entry, As an example I have created a subsystem containing a Gain block with parameter G and entered the following in subsystem mask, parameters, dialog callback; if str2num(get_param(gcb, 'G')) Error evaluating 'MaskCallback' callback of Subsystem block (mask) ' untitled/Subsystem '. --> Gain is negative Can anyone tell me why I get the error evaluating the callback? I am running R2011a on Mac OS X Mountain Lion Thanks

Callback evaluation error using Simulink Masked Subsystem Dialog Callbacks

Chris Emerson

2012 11 9

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I am using dialog callbacks to validate data entry, As an example I have created a subsystem containing a Gain block with parameter G and entered the following in subsystem mask, parameters, dialog callback;

if str2num(get_param(gcb, 'G'))<0 error('Gain is negative.') end

now when I enter a negative value for the Gain I get the following;

--> Error evaluating 'MaskCallback' callback of Subsystem block (mask) '<a href="matlab:open_and_hilite_system ('untitled/Subsystem')">untitled/Subsystem</a>'. --> Gain is negative

Can anyone tell me why I get the error evaluating the callback?

I am running R2011a on Mac OS X Mountain Lion

Thanks