mysum.m

matlab 实用教程（ppt

function [s,n]=mysum1(x,y)
%

if nargin==1
    s=x;
elseif nargin==0
    s=0;
else
    s=x+y;
end
if nargout==0
    s=0;
end
n=nargin;

function [s,n]=mysum2(varargin)
%

if nargin==1
    s=varargin{1};
elseif nargin==0
    s=0;
else
    s=0;
    for m=1:nargin
        s=s+varargin{m};
    end
end
if nargout==0
    s=0;
end
n=nargin;