MATLAB: Global variable and class

bugclassglobalglobalvariablesoopvariables

testcalss.m

    classdef testcalss
        properties(Access = public)
            a;
            F;
        end
        methods(Access = public)
            function this = testcalss()            
                if (1 == 1)
                    this.F = eval('@(x)a * x');
                    eval('this.a = 5');
                end
            end
            function Calculate(this)
                a = this.a;
                this.F(1);
            end
        end
    end

test.m:

    global solver;
    solver = testcalss();
    solver.Calculate();

I execute test and after it I get such message:

    Undefined function or variable 'a'.
    Error in testcalss/testcalss/@(x)a*x
    Error in testcalss/Calculate (line 18)
                this.F(1);
    Error in test1 (line 3)
    solver.Calculate();

Where is my bug?

Best Answer

http://stackoverflow.com/questions/33942216/passing-anonymous-function-to-method

I found the solve. You can see my account on the stackoverflow.

Related Solutions

MATLAB: Execute function. Matlab

http://stackoverflow.com/questions/33942216/passing-anonymous-function-to-method

I found the solve. You can see my account on the stackoverflow.

MATLAB: Modifying an immutable/protected variable of a subclass in a superclass method

You're trying to break the fundamental model of OOP: encapsulation. The whole concept of protected properties is that only the class (or its subclasses) can modify them. A superclass has no way to modify the properties of its subclasses. For that matter, there's no guarantee that a subclass would have the propery that it's trying to modify.

Secondly, why are you trying this indirect method for setting properties? Can't you just set the properties of the subclass the normal way? Or even just override your setProperties method in the subclass?

If you really want to set the properties from the superclass, what you can do though is have a method setsubProperties in the superclass that you then override in the subclass. You dispatch to this method from the setProperties method:

classdef Sup < handle %has to be a handle class to modify its own properties
    methods
       function setProperties(this, varargin)
           this.setsubProperties(varargin);
       end
   end 
     methods (Access = protected)
         function setsubProperties(this, varargin)
              error('function must be overriden');
         end
     end
  end
classdef sub < Sup
    methods (Access = proteced)
       function setsubProperties(this, varargin)
           for varg = 1:2:numel(varargin)
               %...
           end
       end
    end
 end

Best Answer

Related Solutions

MATLAB: Execute function. Matlab

MATLAB: Modifying an immutable/protected variable of a subclass in a superclass method

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