清空筛选条件
清空筛选条件

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

7 次查看（过去 30 天）
MathWorks Support Team
回答： Markus Leuthold 2015-4-16
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')

请先登录，再回答此问题。

采纳的回答

MathWorks Support Team
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')

更多回答（1 个）

Markus Leuthold
Markus Leuthold 2015-4-16
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?

类别

在 Help Center 和 File Exchange 中查找有关 Argument Definitions 的更多信息

标签

产品


版本

R2010b

Community Treasure Hunt

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

Start Hunting!

Translated by