Can I call a function defined within another function .m file?

Question

Paul 2018-6-21

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回答： Guillaume 2018-6-21

Hello. Consider a file titled giveA.mat :

function A = giveA(argA)
% Main function
b = giveB(argB);
...
end
function b = giveB(argB) % defined within one file
% simple sub-function
end
% End of file

I'd like to call giveB() somewhere else in the code, but it would be very convenient for me to keep this function as is.

Is there a syntax which will allow this, i.e. can I call giveB() from, say someOtherFunction(). I expect something like

 b = givA(argA)/giveB(argB)
 or
 b = giveA(argA)>giveB(argB)

as this is how Matlab displays location of giveB() in error messages.

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Answer 1

Guillaume 2018-6-21

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As is, it is not possible. Local functions can only be accessed from within the files where they are defined.

The only way to export a local function is to pass a handle to it from the main function of the m file, so you would have to modify your giveA to return a handle to giveB, which would not be compatible with your desired syntax.

What you could do is to wrap both functions in a class:

classdef FunContainer
   methods (static)
      function A  = giveA(argA)
         %...
      end
        function B = giveB(argB)
           %...
        end
     end
  end

which you can use as

b = FunContainer.giveA(A) / FunContainer.giveB(B)

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Answer 2

Fangjun Jiang 2018-6-21

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No. It is a local function. If it needs to be used outside, it has to be saved in a separate .m file.

See Function Basics

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Answer 3

OCDER 2018-6-21

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The next closest thing is to define an object class with static methods (give.m)

 %give.m
 classdef give
     methods(Static)
        function A = A(argA)
            A = argA;
            disp('I gave A');
        end
        function B = B(argB)
            B = argB;
            disp('I gave B');
        end
      end
 end