Why are setters called when loading a class from a file?

I am trying to create a class which represents a tridiagonal matrix as 3 vectors. The main point of this class is error-checking - for example, when I modify values, I want to ensure that I am not changing the size of any of the vectors. Hence, I have created setters to implement this logic.

I have a property which represents the size of my matrix, and M-Lint is throwing warnings about the use of this property: 'A set method for a non-Dependent property should not access another property'. A bit of research suggests that this warning is in place to prevent an issue which might occur when loading the class from a file (that I have no control over the order in which MATLAB loads properties). However, this confuses me - why is there any need for the setters to be called in this case? When I saved the data, it was in a valid state. Hence, it will be valid when loading back into MATLAB.

Answer 1

[Milind Jain]

 classdef MyClass < matlab.mixin.SetGet
     properties
        Prop1 = 6
        Prop2 = 5
     end

     methods
         function set.Prop1(obj,value)
           if (value > obj.Prop2) 
              obj.Prop1 = value;
           else
              error('Property value must be greater than prop2')
           end
         end
     end
  end

the error can be suppressed by using the non-dependent property outside the setter of the other property. As shown below

classdef MyClass < matlab.mixin.SetGet
   properties
      Prop1 = 6
      Prop2 = 5
   end

     methods
         function set.Prop1(obj,value)

           if (validate(obj,value)) 
              obj.Prop1 = value;
           else
              error('Property value must be greater than prop2')
           end
         end
  %        validation outside
         function y = validate(obj, value) 
             y = (value > obj.Prop2);
         end

     end
  end

PS: The warning message is thrown so as to make users aware that MATLAB would reach an ambiguity if multiple initializations occur on the same property.