MATLAB Programming

9 Classes and Objects
end
if d >= 2
s = [s 'x^' int2str(d)];
elseif d == 1
s = [s 'x'];
end
end
d = d - 1;
end
end
Evaluating the Output
If you create the polynom object p
p = polynom([1 0 -2 -5]);
and then call the char method on p
char(p)
MATLAB produces the result
ans =
x^3 - 2*x - 5
The value returned by char is a string that you can pass to eval once you
have defined a scalar value for x. Forexample,
x = 3;
eval(char(p))
ans =
16
See “The Polynom subsref Method” on page 9-31 for a better method to
evaluate the polynomial.
The Polynom display Method
Here is @polynom/display.m. This method relies on the char method to
produce a string representation of the polynomial, which is then displayed
9-30