CONSTRUCTORS  CONSTRUCTORS Class Constructors


Usage
 
 When designing a constructor for a FreeMat class, you should
 design the constructor to take a certain form.  The following
 is the code for the sample mat object 
 
 function p = mat(a)
   if (nargin == 0)
     p.c = [];
     p = class(p,'mat');
   elseif isa(a,'mat')
     p = a;
   else
     p.c = a;
     p = class(p,'mat');
   end
 
 Generally speaking when it is provided with zero arguments, the
 constructor returns a default version of the class using a template
 structure with the right fields populated with default values.  If
 the constructor is given a single argument that matches the class
 we are trying to construct, the constructor passes through the
 argument.  This form of the constructor is used for type conversion.
 In particular, 
 
    p = mat(a)
 
 guarantees that p is an array of class mat.  The last form
 of the constructor builds a class object given the input.  The
 meaning of this form depends on what makes sense for your class.
 For example, for a polynomial class, you may want to pass in the
 coefficients of the polynomial.
 