多元线性回归出现了这个错误
Warning: X is rank deficient to within machine precision.
> In regress at 84
if p < ncolX
    warning(message('stats:regress:RankDefDesignMat'));
    R = R(1:p,1:p);
    Q = Q(:,1:p);
    perm = perm(1:p);
end


是什么原因呢？求大神错在哪里呢？应该怎么修改