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matlab提示:Incomplete or misformed expression or statement.

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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.
最后一个elseif 改为else