Why can use this function with only on input?

Form this document ，need”Google Web Translation“

there is two class AcListSuper AcListNonSub

AcListSuper.m

classdef AcListSuper
   methods (Access = {?AcListNonSub})
      function obj = m1(obj)
         disp ('Method m1 called')
      end
   end
end

AcListNonSub.m

classdef AcListNonSub
   methods
      function obj = nonSub1(obj,AcListSuper_Obj)
         % Call m1 on AcListSuper class
         AcListSuper_Obj.m1;
      end
      function obj = m1(obj)
         % Define a method named m1
         disp(['Method m1 defined by ',class(obj)])
      end
   end
end

creat two object a b

a = AcListSuper;
b = AcListNonSub;

When I run this,program will call" function obj = nonSub1(obj,AcListSuper_Obj)" ,but this function has two input,“b.nonSub1(a);" just give one input! function "nonSub1" has no input test like "nargin" ………… ，but there is no erro waring!

I run this program and tracking to "AcListNonSub.nonSub1",I found "obj" class is "AcListNonSub" , "AcListSuper_Obj" class is "AcListSuper" .

Why? b.nonSub1(a) just give one input , AcListNonSub.nonSub1 automatically assigned two classes to “obj” and “AcListSuper_Obj” ？

According to what rules does MATLAB assign input parameters?

b.nonSub1(a);

Answer 1

[Steven Lord]

b.nonSub1(a) just give one input

Incorrect. As shown in the "Dot and Function Syntaxes" section on this documentation page this is not equivalent to calling nonSub1 with just a as input. It is equivalent to nonSub1(b, a) in almost all circumstances. [The case where it doesn't is if the class of a lists the class of b as one of its InferiorClasses, as discussed on this documentation page and the "Determining Which Method Is Invoked" section on the first documentation page to which I linked.]

[fa wu]

Thanks for your help.I got it!