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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