cannot update class definition in Matlab

Question

I am running into an infuriating problem with Matlab, and an earlier answer to apparently the same problem didn\'t help me, unfortunately. I apologize that the question is

Answer 1

You have an intermediate instance myClass.father that is not being destroyed by MATLAB. You have to deleteit yourself

>> clear grandpa
>> delete(son.precursors{1})
>> clear son
>> clear classes
>> son = myClass.son
son = 
    son    
>> sumVal(son)
ans =
     6

Edit: Alternatively, you can add a destructor to your class

    function delete(obj)
        if isa(obj.precursors{1}, 'myClass')
            delete(obj.precursors{1});
        end
    end

and use delete(son) instead of leaving it to clear function to destroy. You can extend this to your case and recursively delete all instances in your tree.