Linking fields of a structure

Hello,

I have a scenario where two fields of a structure have a relationship. My question is, how to change one field automatically, if the other is changed manually?

Say, The structure is Amp with fields a,b,c,d. Now, Amp.a=Amp.b+10. My question is, how to update Amp.a, when I change Amp.b?

I know that it is a redundant field and I can use "Amp.b+10" wherever required. But I have multiple blocks with such a need and the readabilty of the equations is affected.

Note that I am using these variables in Simulink blocks and not directly in Matlab code. So, I should be able to save the workspace as per my requirement prior to simulations.

Any help is much appreciated!

Answer 1

[Matt J]

You would need to write your own class and use that instead of the structure. But once you do, it's the kind of thing Dependent class properties do very readily.

http://www.mathworks.com/help/matlab/matlab_oop/example--representing-structured-data.html#f2-85430

[Matt J]

As an illustration, the class down on that bottom lets you define an object for which S.b=S.a+10 always. Here are examples of its usage:

>> S=myclass; S.a=1:3; S.b

ans =

      11    12    13

>> S.a(2)=5; S.b(2)

ans =

      15

    classdef myclass

     properties
       a
     end

     properties (Dependent=true,SetAccess=private)

         b
     end

     methods

         function val=get.b(obj)

             val=obj.a+10;

         end

     end

    end

[Mahitha]

Thank you.