MATLAB Programming

9 Classes and Objects
Examples of Constructor Methods
See the following sections for examples of constructor methods:
• “The Polynom Constructor Method” on page 9-27
• “The Asset Constructor Method” on page 9-43
• “The Stock Constructor Method” on page 9-50
• “The Portfolio Constructor Method” on page 9-59
Identifying Objects Outside the Class Directory
The class and isa functions used in constructor methods can also be used
outside of the class directory. The expression
isa(a,'classname');
checks whether a is an object of the specified class. For example, if p is a
polynom object, each of the following expressions is true.
isa(pi,'double');
isa('hello','char');
isa(p,'polynom');
Outside of the class directory, the class function takes only one argument (it
is only within the constructor that class canhavemorethanoneargument).
The expression
class(a)
returns a string containing the class name of a. For example,
class(pi),
class('hello'),
class(p)
return
'double',
'char',
'polynom'
9-12