MATLAB Object-Oriented Programming

Example Code Discussion

function r = plus(obj1,obj2)

obj1 = DocPolynom(obj1);

obj2 = DocPolynom(obj2);

k = length(obj2.coef) - length(obj1.coef);

zp = zeros(1,k);

zm = zeros(1,-k);

r = DocPolynom([zp,obj1.coef] + [zm,obj2.coef]);

end

function r = minus(obj1,obj2)

obj1 = DocPolynom(obj1);

obj2 = DocPolynom(obj2);

k = length(obj2.coef) - length(obj1.coef);

zp = zeros(1,k);

zm = zeros(1,-k);

r = DocPolynom([zp,obj1.coef] - [zm,obj2.coef]);

end

function r = mtimes(obj1,obj2)

obj1 = DocPolynom(obj1);

obj2 = DocPolynom(obj2);

r = DocPolynom(conv(obj1.coef,obj2.coef));

end

end

Define three arithmetic

operators:

• Polynomial addition


• Polynomial subtraction


• Polynomial multiplication

For information about this code,

see “Define Arithmetic

Operators” on page 19-21.

For general information about

defining operators, see

“Operator Overloading” on page

17-47

end

end

end statements for methods and

for classdef.

Expand for Class Code

classdef DocPolynom
% Documentation example
% A value class that implements a data type for polynomials
% See Implementing a Class for Polynomials in the
% MATLAB documentation for more information.

properties
coef
end

% Class methods
methods
function obj = DocPolynom(c)

Representing Polynomials with Classes