Class: matlab.System
Package: matlab

Initialize System object




setupImpl(obj) sets up a System object™ and implements one-time tasks that do not depend on any inputs to the stepImpl method for this object. To acquire resources for a System object, you must use setupImpl instead of a constructor. setupImpl executes the first time the step method is called on an object after that object has been created. It also executes the next time step is called after an object has been released. You typically use setupImpl to set private properties so they do not need to be calculated each time stepImpl method is called.

setupImpl(obj,input1,input2,...) sets up a System object using one or more of the stepImpl input specifications. The number and order of inputs must match the number and order of inputs defined in the stepImpl method. You pass the inputs into setupImpl to use the specifications, such as size and datatypes in the one-time calculations. You do not use the setupImpl method to set up input values.



    You must set Access = protected for this method.





Input Arguments


System object handle


Inputs to the stepImpl method


expand all

Setup a File for Writing


methods (Access = protected)
   function setupImpl(obj)
      obj.pFileID = fopen(obj.Filename,'wb');
      if obj.pFileID < 0
         error('Opening the file failed');

Check input size

This examples shows how to use setupImpl to check that the size of a stepImpl method input matches the size of a state property.

properties (Access = private)
     myState = [1 2];
  methods (Access = protected)
     function setupImpl(obj,u)
        if any(size(obj.myState) ~= size(u))
           error('Size of "myState" does not match size of input "u"');
     function y = stepImpl(obj,u)
        y = obj.myState;
        obj.myState = u;
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