Trying to add fields to Class I am making

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Stagleton 2011-8-18

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https://ww2.mathworks.cn/matlabcentral/answers/13969-trying-to-add-fields-to-class-i-am-making

I am trying to add fields to a class that I am creating. Maybe I don't understand how this is done completely. I thought a class could be similar to a structure where you can define objects of that class that have specific fields filled out in the structure. I want my class to have two fields that I am having trouble with: numerator and denominator

here is the end part of my code where I am trying to make the class:

h.numerator=numa;
 h.denominator=dena;
 h.coeff = [];
 h.symbol = 'x';
   class(h)
h = class(h,'rational'); 
end

And the error message I get is: ??? Error using ==> class Cannot change the number of fields of class 'rational' without first typing 'clear classes'.

Error in ==> rational.rational at 58 h = class(h,'rational');

There is something fundamental that I do not understand. How do I create fields that include the numerator and denominator objects which I construct earlier in the constructor?