小女子floyd算法遇到一点问题 求大神指点一二

  function [D,path]=floyd(a)
n=size(a,1);
D=a;
path=zeros(n,n);
for i=1:n
    for j=1:n
        if D(i,j)~=inf
            path(i,j)=j;
        end
    end
end
for k=1:n
    for i=1:n
        for j=1:n
            if D(i,k)+D(k,j)<D(i,j)
                D(i,j)=D(i,k)+D(k,j);
                path(i,j)=path(i,k)
            end
        end
    end
end
???  function [D,path]=floyd(a)
     |
Error: Function definitions are not permitted in this context.