MATLAB: Running the matlab class example

ooprunning the matlab class examplerunnning the class

This is an example provided by MATLAB for ''Modify Property Values with Access Methods''. How to run this?

classdef Testpoint
  properties
      expectedResult = [];
   end
   properties(Constant)
      scalingFactor = 0.001;
   end
   methods
      function obj = set.expectedResult(obj,erIn)
         if erIn >= 0 && erIn <= 100
            erIn = erIn.*obj.scalingFactor;
            obj.expectedResult = erIn;
         else
            obj.expectedResult = NaN;
         end
      end
      function er = get.expectedResult(obj)
         er = obj.expectedResult/obj.scalingFactor;
      end
   end
end

Best Answer

t = Testpoint; % Create the object
t.expectedResult = 7; % Set the property
t.expectedResult % Get the property

for example.

Related Solutions

MATLAB: Setter method does not work on inherited class

You're using handle syntax to set the property of your class, yet your class is a value class. Either change your setFoo to:

function obj = setFoo(obj, foo)
   obj.foo = foo;
end

and call it with:

test = test.setFoo(10);

or derive from handle:

classdef Foo < matlab.mixin.Heterogeneous & handle

Also, you can create setter and getter for the class properties, using this syntax

function set.foo(obj, value) %for handle class
   obj.foo = value;
end
function obj = set.foo(obj, value) % for value class
   obj.foo = value;
end

which you call simply with:

obj.foo = 10; %for value and handle class.

MATLAB: How to modify private properties from inside a class

The default MATLAB class is a 'value' class. If you call a method that changes a property of a 'value' class object, the operation will return a new object with the modification. However the original object will remain unchanged unless reassigned. To avoid this, inherit from the 'handle' class instead. For more information about the difference between 'value' and handle classes, see the following documentation link:

https://www.mathworks.com/help/matlab/matlab_oop/comparing-handle-and-value-classes.html

The following code will give an example of using a public method to change a private property:

classdef CTester < handle
properties (Access = private) 
expectedResult = []; 
end 
methods 
    function setExpectedResult(obj,In) 
        obj.expectedResult = In; 
    end 
    function y = getExpectedResult(obj) 
        y = obj.expectedResult; 
    end 
    end 
end

Now try running to check that it works:

>> tester = CTester;
>> tester.setExpectedResult(2.87);
>> tester.getExpectedResult

Best Answer

Related Solutions

MATLAB: Setter method does not work on inherited class

MATLAB: How to modify private properties from inside a class

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