MATLAB Programming

9 Classes and Objects
case 'date'
a.date = val;
case 'currentValue'
a.currentValue = val;
otherwise
error('Invalid field name')
end
end
The subsasgn method enables you to assign values to the asset object data
structure using two techniques. For example, suppose you have a child stock
object s. (If you want to run this statement, you first need to create a stock
constructor method.)
s = stock('XYZ',100,25);
Within stock class methods, you could change the descriptor field with
either of the following statements
s.asset(1) = 'ABC';
or
s.asset.descriptor = 'ABC';
See the “The Stock subsasgn Method” on page 9-55 for an example of how the
child subsasgn method calls the parent subsasgn method.
The Asset display Method
The asset display method is designed to be called from child-class display
methods. Its purpose is to display the data it stores for the child object. The
method simply formats the data for display in a way that is consistent with
the formatting of the child’s display method.
function display(a)
% DISPLAY(a) Display an asset object
stg = sprintf(...
'Descriptor: %s\nDate: %s\nType: %s\nCurrent Value:%9.2f',...
a.descriptor,a.date,a.type,a.currentValue);
disp(stg)
9-48