Process Tuned Properties

This example shows how to specify the action to take when a tunable property value changes during simulation.

The processTunedPropertiesImpl method is useful for managing actions to prevent duplication. In many cases, changing one of multiple interdependent properties causes an action. With the processTunedPropertiesImpl method, you can control when that action is taken so it is not repeated unnecessarily.

Control When a Lookup Table Is Generated

This example of processTunedPropertiesImpl causes the pLookupTable to be regenerated when either the NumNotes or MiddleC property changes. 

methods  (Access = protected)
   function processTunedPropertiesImpl(obj)
      propChange = isChangedProperty(obj,'NumNotes')||...
         isChangedProperty(obj,'MiddleC')
      if propChange
         obj.pLookupTable = obj.MiddleC *...
           (1+log(1:obj.NumNotes)/log(12));
      end
    end
end

Complete Class Definition File with Tuned Property Processing

classdef TuningFork < matlab.System
  % TuningFork Illustrate the processing of tuned parameters
  %
  
  properties
    MiddleC = 440
    NumNotes = 12
  end
  
  properties (Access = private)
    pLookupTable
  end
  
  methods (Access = protected)
    function resetImpl(obj)
      obj.MiddleC = 440;
      obj.pLookupTable = obj.MiddleC * ...
         (1+log(1:obj.NumNotes)/log(12));
    end
    
    function hz = stepImpl(obj,noteShift)
      % A noteShift value of 1 corresponds to obj.MiddleC
      hz = obj.pLookupTable(noteShift);
    end
    
    function processTunedPropertiesImpl(obj)
      propChange = isChangedProperty(obj,'NumNotes')||...
         isChangedProperty(obj,'MiddleC')
      if propChange
         obj.pLookupTable = obj.MiddleC *...
           (1+log(1:obj.NumNotes)/log(12));
      end
  end
end

See Also