Writing "this" class' properties?

7 次查看（过去 30 天）
Eleftherios Ioannidis
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 1x2 vector. It should be a zero 1x2 vector. Why does this.v remain the same?
Thank you
  2 个评论
Andrew Newell
Andrew Newell 2011-3-23
I'm not sure what you're trying to do. Do you want to change your agent and also return a vector, or just change your object?
Andrew Newell
Andrew Newell 2011-3-23
Also, what is step supposed to do? As written, it is adding rows when step > 1.

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采纳的回答

Andrew Newell
Andrew Newell 2011-3-23
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
  1 个评论
Eleftherios Ioannidis
Eleftherios Ioannidis 2011-3-23
Great answer Andrew, as always. Thank you. Also, thank you for the pm.

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