Define shared subfunctions inside a classdef *.m file?

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Knut
Knut 2011-2-21
I want to define a relatively small class (small enough that it makes sense to do everything inside of one file). I want to reuse a common subfunction between several methods, and having this subfunction inside of the classdef would make it cleaner, easily portable and automatically private. However, I have not been able to do so. Is there any way to accomplish it?
>> d = dummy;
>>??? Undefined function or variable 'my_pi'.
>>
>>Error in ==> dummy>dummy.dummy at 10
>> obj.dummy = my_pi();
dummy.m:
classdef dummy
properties
value;
end
methods
function y = my_pi()
y = 3.141592;
end
function obj = dummy()
obj.dummy = my_pi();
end
end
end

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采纳的回答

per isakson
per isakson 2011-2-21
You can define subfunctions in the same file after the definition of the class, ie
classdef dummy
...
...
end % classdef
function out = subfun1( in )
...
end
/ per

更多回答（1 个）

David Young
David Young 2011-2-21
Non-static methods require an object as the first argument, and as my_pi is not declared static and doesn't have an argument, it isn't found.
Rather than putting my_pi at the end of the file, I would include it properly in the class by declaring it to be static:
classdef dummy
properties
value;
end
methods
function obj = dummy()
obj.value = dummy.my_pi();
end
end
methods (Static)
function y = my_pi()
y = 3.141592;
end
end
end
You need to use the class name in the call to the static method. I've also corrected the assignment in the constructor: I assume that you intented to set the value property.
You could also set my_pi's access to private if you want it only to be visible from other methods of the class.
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显示 6更早的评论
David Young
David Young 2011-2-22
Agreed - it does depend on the programming context. Also, I see I can't count. Oh well...
Knut
Knut 2011-2-23
@David:
Yes, I accepted the first reply before I saw yours, because it did solve my problem, your post just solved it more elegantly (for me). Now, I cant seem to change the acceptance.

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