How to use property from one class in to define a property in another class?

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Prashanti Ganesh 2021-8-6

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https://ww2.mathworks.cn/matlabcentral/answers/893672-how-to-use-property-from-one-class-in-to-define-a-property-in-another-class

评论： Prashanti Ganesh 2021-8-9

采纳的回答： Rik

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Hi All,

I have defined one class

classdef AgentVars
    properties
        set_o = linspace(-0.2,0.2,20) % set of observations
    end   
end

I want to use the the set_o property in another class. For example

classdef Agent
    properties
        set_o = AgentVars.set_o
    end
end

However, currently I am not able to access a property from the other class. How can I do that? Thank you

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Answer 1

Rik 2021-8-6

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https://ww2.mathworks.cn/matlabcentral/answers/893672-how-to-use-property-from-one-class-in-to-define-a-property-in-another-class#answer_762342

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I don't know what the 'correct' answer would be, but you can also set the value in the constructor:

classdef Agent
    properties
        set_o = NaN
    end
    methods
        function obj=Agent
            obj.set_o=AgentVars.set_o
        end
    end
end

You could also inherit from a superclass, but that only works if you want to inherit from a single class.

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Rik 2021-8-6

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Looking at your code structure it makes most sense to inherit the parameters, making AgentVars a superclass. Is there any reason you don't?

Alternatively, you could do as the error message suggests: make the properties in AgentVars Constant.

After a few more edits (putting calculated properties in the constructor, it runs without error:

a=Agent

a =

Agent with properties: set_o: [-0.2000 -0.1789 -0.1579 -0.1368 -0.1158 -0.0947 -0.0737 -0.0526 -0.0316 -0.0105 0.0105 0.0316 0.0526 0.0737 0.0947 0.1158 0.1368 0.1579 0.1789 0.2000] kappa: 0.0800 sigma: 0.0400 c_t: 1 beta: 100 agent: 1 lambda: NaN eval_ana: 1 alpha: 0.1000 task_agent_analysis: NaN q_0_0: 0.5000 o_t: NaN d_t: NaN a_t: NaN r_t: NaN pi_0: NaN pi_1: NaN E_mu_t: 0.5000 v_a_0: NaN v_a_1: NaN v_a_t: NaN p_a_t: NaN t: NaN p_o_giv_u: [0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0] p_o_giv_u_norm: [0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0] C: NaN q_o: NaN q_1: NaN d: NaN G: NaN p_d_t: [NaN NaN] Q_t: [2×2 double] product: [1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1] mu: [100×100 double] p_mu: [1×100 double] mu_for_ev: [100×1 double]

Rik 2021-8-6

As far as I know that isn't an official term. Take a look at the file I attached: the values of some properties are calculated based on the values of other properties. Because those aren't yet initialized, they can't be accessed in the properties block. That is why they are calculated in the constructor.

Prashanti Ganesh 2021-8-9