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classdef
ClassA very basic classdef
value class
(see Value Classes vs. Handle Classes) is defined by:
classdef some_class properties endproperties methods endmethods endclassdef
In contrast to old style classes, the properties
-endproperties
block as well as the methods
-endmethods
block can be used to
define properties and methods of the class. Because both blocks are empty,
they can be omitted in this particular case.
For simplicity, a more advanced implementation of a classdef
class is
shown using the polynomial
example again (see Creating a Class):
classdef polynomial2 properties poly = 0; endproperties methods function p = polynomial2 (a) if (nargin == 1) if (isa (a, "polynomial2")) p.poly = a.poly; elseif (isreal (a) && isvector (a)) p.poly = a(:).'; # force row vector else error ("polynomial2: A must be a real vector"); endif endif endfunction function disp (p) a = p.poly; first = true; for i = 1 : length (a); if (a(i) != 0) if (first) first = false; elseif (a(i) > 0 || isnan (a(i))) printf (" +"); endif if (a(i) < 0) printf (" -"); endif if (i == 1) printf (" %.5g", abs (a(i))); elseif (abs (a(i)) != 1) printf (" %.5g *", abs (a(i))); endif if (i > 1) printf (" X"); endif if (i > 2) printf (" ^ %d", i - 1); endif endif endfor if (first) printf (" 0"); endif printf ("\n"); endfunction endmethods endclassdef
An object of class polynomial2
is created by calling the class
constructor:
>> p = polynomial2 ([1, 0, 1]) ⇒ p = 1 + X ^ 2