stock.m

matlab实用教程

function s = stock(varargin)
% STOCK Stock class constructor. 
% s = stock(descriptor, numShares, sharePrice)
switch nargin
case 0 
   % if no input arguments, create a default object
   s.numShares = 0;
   s.sharePrice = 0;
   a = asset('none',0);
   s = class(s,'stock',a);      
case 1
   % if single argument of class stock, return it
   if (isa(varargin{1},'stock'))
      s = varargin{1}; 
   else
      error('Input argument is not a stock object')
   end
case 3
   % create object using specified values
   s.numShares = varargin{2};
   s.sharePrice = varargin{3};
   a = asset(varargin{1},'stock',varargin{2} * varargin{3});
   s = class(s,'stock',a);
otherwise
   error('Wrong number of input arguments')
end