MATLAB Object-Oriented Programming

creates a DocPolynom object. Because the statement is not terminated with a semicolon,

the resulting output is displayed on the command line:

p =

x^3 - 2*x - 5

Display Evaluated Expression

The char converter method forms a MATLAB expression for the polynomial represented

by a DocPolynom object. The dispPoly method evaluates the expression returned by

the char method with a specified value for x.

methods

function dispPoly(obj,x)

p = char(obj);

e = @(x)eval(p);

y = zeros(length(x));

disp(['y = ',p])

for k = 1:length(x)

y(k) = e(x(k));

disp([' ',num2str(y(k)),...

' = f(x = ',...

num2str(x(k)),')'])

end

end

end

Create a DocPolynom object p:

p = DocPolynom([1 0 -2 -5])

p =

x^3 - 2*x - 5

Evaluate the polynomial at x equal to three values, [3 5 9]:

dispPoly(p,[3 5 9])

y = x^3 - 2*x - 5

16 = f(x = 3)

110 = f(x = 5)

706 = f(x = 9)

19 Defining Custom Data Types