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what is wrong of this class

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C Shen
C Shen 2011-8-23
classdef dummya
properties
value;
end
methods
function obj = dummya( aa)
obj.value = test( aa);
end
end
methods (Static)
function y = my_pi(a)
y = 3.141592*test(a);
end
end
methods
function y = test(a)
y = 3.141592*a;
end
end
end

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Jared
Jared 2011-8-23
What is the error you are receiving? I saved your test code to file (dummy.m) and it seemed to work.
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Jared
Jared 2011-8-24
Ok, I think the key is static methods.
Most class methods require an object as an input. That is, you could write:
function = test(obj,a)
...
end
You can call the method either as test(obj,a) or as obj.test(a) for some obj.
The exception to this are static methods. From the help file:
"Static methods are associated with a class, but not with specific instances of that class. These methods do not perform operations on individual objects of a class and, therefore, do not require an instance of the class as an input argument, like ordinary methods."
Thus, my_pi(a) works just fine, even though a is not an instance of the class, dummya.
Does this make sense?
C Shen
C Shen 2011-8-24
But Static method can't call regular method, right?
classdef dummya
properties
value;
end
methods
function obj = dummya( aa)
obj.value = mtest(obj, aa);
obj.value = dummya.sfun(aa); %this does not work
end
end
methods (Static)
function obj = sfun(a)
obj = 2*mtest(obj,a);
end
end
methods
function y = mtest(obj, a)
y = 3*a;
end
end
end

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