How can I use NARGIN/NARGOUT to determine the number of input/output arguments of an object method?

조회 수: 15 (최근 30일)
I am trying to determine the number of input/output arguments of an object's method. When the name of any object method is passed to NARGIN/NARGOUT, the returned value is always -1 regardless of the number of inputs/outputs specified in the method signature.
The following syntax returns -1 for any MethodName:
nargout('MethodName')

채택된 답변

MathWorks Support Team
MathWorks Support Team 2010년 9월 20일
The ability to call NARGIN/NARGOUT directly on object methods is not available in MATLAB. As a workaround, specify the class and method names explicitly using the following syntax:
nargout('ClassName>ClassName.MethodName')

추가 답변 (1개)

Markus Leuthold
Markus Leuthold 2015년 4월 16일
It's almost five years later and this bug still exists. Any news from Mathworks on how to handle this situation in 2015?
Example:
Class C
classdef C < handle
methods
function r=fcn1(~)
r='run fcn1';
end
function fcn2(~)
disp('run fcn2');
end
end
end
function run
function run(f)
switch nargout(f)
case 0
feval(f);
case 1
disp(feval(f));
case -1
disp('bug')
end
What I expect from the following code
>> c=C;
>> run(@c.fcn1)
run fcn1
>> run(@c.fcn2)
run fcn2
Instead I get
>> c=C;
>> run(@c.fcn1)
bug
>> run(@c.fcn2)
bug
How do you recommend to workaround in case where you want to know nargout from a function handle AND evaluate a function handle?

카테고리

Help CenterFile Exchange에서 Argument Definitions에 대해 자세히 알아보기

제품


릴리스

R2010b

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by