matlab 出现Subscript indices must either be real positive inte

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matlab 出现Subscript indices must either be real positive integers or logicals样的错误
这是2007年B题的程序：
st=3748;
en=2160;
y=1;
za=[];
for i=1:k(st)
for j=1:k(en)
if Z(en,j)==Z(st,i)
df=round(Z(en,j));
aa=find(L{df,4}==st);%AA
bb= find(L{df,4}==en);
if aa

st=3748;
en=2160;
y=1;
za=[];
for i=1:k(st)
for j=1:k(en)
if Z(en,j)==Z(st,i)
df=round(Z(en,j));%%%更改
%df可能是0或负值.应该属于逻辑错误吧.
if df

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