怎么用内部的例子计算nnpls时出现了错误！如下：
Error in ==> QLSEARCH at 15
dir=dir/norm(dir);

??? Output argument "x" (and maybe others) not assigned during call to "D:\Documents
and Settings\lily\桌面\NN_PLS\QLSEARCH.M>QLSEARCH".

Error in ==> CGRDSRCH at 65
    [x,beta,kin,fopt,flag]=qlsearch(t,u,x,f1,n,step,dir1,flag,Lambda);

Error in ==> INNER at 61
  x=cgrdsrch(beta,kin,t,u);

Error in ==> NNPLS1 at 93
  [weights,f1]=inner(n,b,t,u,weights,plots);

Error in ==> NNPLS at 104
        [n,weights,upred]=nnpls1(t,u,ttest,utest,i,opts);
您用过么，能不能帮忙看看！

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