matlab提示：Incomplete or misformed expression or statement.function re = add_multi(a,b,c,d)% 输入：a,b,c,d% 输出：reif nargin == 4re = a + b + c + d;elseif nargin == 3re = a + b + c;elseif nargin == 2re = a + b;elseiferror('wrong')end调用

matlab提示：Incomplete or misformed expression or statement.function re = add_multi(a,b,c,d)% 输入：a,b,c,d% 输出：reif nargin == 4re = a + b + c + d;elseif nargin == 3re = a + b + c;elseif nargin == 2re = a + b;elseiferror('wrong')end调用
matlab提示：Incomplete or misformed expression or statement.
function re = add_multi(a,b,c,d)
% 输入：a,b,c,d
% 输出：re
if nargin == 4
re = a + b + c + d;
elseif nargin == 3
re = a + b + c;
elseif nargin == 2
re = a + b;
elseif
error('wrong')
end
调用上面的函数文件时,matlab提示：
>> add_multi(1,2,3,4)
Error:File:C:\MATLAB7\work\add_multi.m Line:12 Column:7
Incomplete or misformed expression or statement.
能不能帮我看看问题出在哪里

matlab提示：Incomplete or misformed expression or statement.function re = add_multi(a,b,c,d)% 输入：a,b,c,d% 输出：reif nargin == 4re = a + b + c + d;elseif nargin == 3re = a + b + c;elseif nargin == 2re = a + b;elseiferror('wrong')end调用
最后一个elseif 改为else