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?

Answer 1

[Daniel Shub]

Have you tried

clear classes

The error message looks like you have loaded the class into memory and then made a change to the class definition.

[Stagleton]

yeah I tried to do that but without any luck.

Hmm, I fired up MATLAB today and it seems to be working now. I don't get it.

here is my code for the end of the constructor for my Class:

class(numa)

class(dena)

h.denominator=dena;

h.numerator=numa;

class(h.numerator)

h.coeff = [];

h.symbol = 'x';

h = class(h,'rational');

[Daniel Shub]

So is it fixed or not. Sometimes clear classes fails if there are objects of the class in memory.

[Stagleton]

It is working for now....but there must be something that I am missing and the problem may come back

[Stagleton]

you were right