Linking fields of a structure

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Mahitha 2014-8-19

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https://ww2.mathworks.cn/matlabcentral/answers/151438-linking-fields-of-a-structure

评论： Mahitha 2014-8-19

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!

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Answer 1

Matt J 2014-8-19

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https://ww2.mathworks.cn/matlabcentral/answers/151438-linking-fields-of-a-structure#answer_149068

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

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Matt J 2014-8-19

编辑：Matt J 2014-8-19

在 MATLAB Online 中打开

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