MATLAB: Writing “this” class’ properties

classfunctionMATLABoopthis

Hi, I am new to Matlab classes. I want to change the value of some properties in a function called ChangeProperties from within the class. But I can't do it. What am I doing wrong?
classdef agent_type
  properties
    v
    id
  end
  methods
    function p=agent_type(i)
      p.id=i;
      p.v=10*randn(1,2);
    end
   function y=ChangeProperties(this,step)
     [this.v(step,:)]=zeros(1,2); 
      y=[this.v(step,:)];
   end
 end
end
when I run: agent.ChangeProperties(2) I get a random 1×2 vector. It should be a zero 1×2 vector. Why does this.v remain the same?
Thank you

Best Answer

I'm just guessing at what you're trying to do, but here is a different version of your method:
function y=ChangeProperties(this,vnew)
  y = this;
  y.v=vnew;
end
Then if you run
a = agent_type(1);
a = a.ChangeProperties([0 0])
you get
a = 
agent_type
Properties:
   v: [0 0]
  id: 1
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