Defining structure as a property of a class

I defined a class having params property like this. (I removed method part)

It works well but then I notice one-line params definition is hard to follow and for description. I tried the commented codes but it did not work. What would you recommend me to do? Thank you in advance.

classdef CartPole
    %CARTPOLE Summary of this class goes here
    %   Detailed explanation goes here   
    properties
%         field1 = 'length';  value1 = 0.6;        % [m]
%         field2 = 'mCart';   value2 = 0.5;         % [kg]  
%         field3 = 'mPole';   value3 = 0.5;         % [kg]
%         field4 = 'fric';    value4 = 0.1;          % [N/m/s] 
%         field5 = 'g';       value5 = 9.82;            % [m/s2]
%         params = struct(field1,value1,field2,value2,field3,value3,field4,value4,field5,value5)
        params = struct('length',0.6,'mCart',0.5,'mPole',0.5,'fric',0.1,'g',9.82)
        states = [0;0;0;0]  % [x (m); dx (m/s); dtheta (rad/s); theta (rad)] 
        dstates = [0;0;0;0]
    end
end

Answer 1

[Matt J]

Perhaps as follows?

classdef CartPole
    %CARTPOLE Summary of this class goes here
    %   Detailed explanation goes here   
    properties
        
        params = struct('length',0.6,...  % [m]
                        'mCart',0.5, ...  % [kg]
                        'mPole',0.5, ...  % [kg]
                        'fric',0.1, ...   % [N/m/s] 
                        'g',9.82)         % [m/s2]

        states = [0;0;0;0]  % [x (m); dx (m/s); dtheta (rad/s); theta (rad)] 
        dstates = [0;0;0;0]
    end
end

[Khai Nguyen]

Thank you. This is great.

[Matt J]

You're very welcome, but please Accept-click the answer to indicate that it addressed your problem.