使用intersect返回错误

[lijiaxin0932]

各位大神，我的程序如下：
[m,n] = size(DTI);
share=zeros(m);

for ii=1:m-1
for jj=ii+1:m
a=DTI(ii,:);
b=DTI(jj,:);
a(cellfun('isempty',a))=[];
b(cellfun('isempty',b))=[];
c=intersect(a,b);
if length(c)>=1
d=length(c);
share(ii,jj)=d;
share(jj,ii)=d;
end
end
end

返回错误为：
Error using cell/intersect>cellintersectlegacy (line 158)
Input A of class cell and input B of class cell must be cell arrays of strings, unless one is a string.

Error in cell/intersect (line 91)
[varargout{1:nlhs}] = cellintersectlegacy(varargin{:});

Error in ATC (line 10)
c=intersect(a,b);

我的DTI内容大致如下：
872 423 580 530 523 841 4098 4100
193 [] [] [] [] [] [] []
466 610 295 357 592 [] [] []
872 423 580 530 523 841 947 4095
[] [] [] [] [] [] [] []
[] [] [] [] [] [] [] []


望各位大神解答~~~