Redefine Indexed Reference
The DocPolynom class redefines indexed reference to support the use of objects
representing polynomials. In the DocPolynom class, a subscripted reference to an object
causes an evaluation of the polynomial with the value of the independent variable equal to
the subscript.
For example, given the following polynomial:
Create a DocPolynom object p:
p = DocPolynom([1 0 -2 -5])
p =
x^3 - 2*x - 5
The following subscripted expression evaluates the value of the polynomial at x = 3 and
at x = 4, and returns the resulting values:
p([3 4])
ans =
16 51
Indexed Reference Design Objectives
Redefine the default subscripted reference behavior by implementing a subsref method.
If a class defines a subsref method, MATLAB calls this method for objects of this class
whenever a subscripted reference occurs. The subsref method must define all the
indexed reference behaviors, not just a specific case that you want to change.
The DocPolynom subsref method implements the following behaviors:
- p(x = [a 1 ...an]) — Evaluate polynomial at x = a.
- p.coef — Access coef property value
- p.disp — Display the polynomial as a MATLAB expression without assigning an
output. - obj = p.method(args) — Use dot notation to call methods arguments and return a
modified object.
Representing Polynomials with Classes