MATLAB Programming

9 Classes and Objects
end
if savingsAmt ~= 0
label(i) = {'Savings'};
pieVector(i) = savingsAmt;
end
pie3(pieVector, label)
set(gcf, 'Renderer', 'zbuffer')
set(findobj(gca, 'Type', 'Text'), 'FontSize', 14)
cm = gray(64);
colormap(cm(48:end, :))
stg(1) = {['Portfolio Composition for ', p.name]};
stg(2) = {['Total Value of Assets: $', num2str(p.totalValue)]};
title(stg, 'FontSize', 12)
There are three parts in the overloaded pie3 method.
• The first uses the asset subclass get methods to access the CurrentValue
property of each contained object. The totalvalueofeachclassissummed.
• The second part creates the pie chart labels and builds a vector of graph
data, depending on which objects are present.
• The third part calls the MATLAB pie3 function, makes some font and
colormap adjustments, and adds a title.
Creating a Portfolio
Suppose you have implemented a collection of asset subclasses in a manner
similar to the stock class. You can then use a portfolio object to present the
individual’s financial portfolio. For example, given the following assets
XYZStock = stock('XYZ', 200, 12);
SaveAccount = savings('Acc # 1234', 2000, 3.2);
Bonds = bond('U.S. Treasury', 1600, 12);
create a portfolio object:
p = portfolio('Gilbert Bates',XYZStock,SaveAccount,Bonds)
The portfolio display method summarizes the portfolio contents (because this
statement is not terminated by a semicolon).
9-62