MATLAB Programming

Example — The Portfolio Container
• portfolio — The portfolio constructor.
• display — Displays information about the portfolio contents.
• pie3 — Overloaded version of pie3 function designed to take a single
portfolio object as an argument.
Since a portfolio object contains other objects, the portfolio class methods can
use the methods of the contained objects. For example, the portfolio display
method calls the stock class display method, and so on.
The Portfolio Constructor Method
The portfolio constructor method takes as input arguments a client’s name
and a variable length list of asset subclass objects (stock, bond, and savings
objects in this example). The portfolio object uses a structure array with the
following fields:
• name — The client’s name.
• indAssets — The array of asset subclass objects (stock, bond, savings).
• totalValue — The total value of all assets. The constructor calculates this
value from the objects passed in as arguments.
• accountNumber — The account number. This field is assigned a value only
when you save a portfolio object (see “Saving and Loading Objects” on
page 9-64).
function p = portfolio(name,varargin)
% PORTFOLIO Create a portfolio object containing the
% client's name and a list of assets
switch nargin
case 0
% if no input arguments, create a default object
p.name = 'none';
p.totalValue = 0;
p.indAssets = {};
p.accountNumber = '';
p = class(p,'portfolio');
case 1
% if single argument of class portfolio, return it
9-59