%信號子空間轉換矩陣；第一個參數(shù)為想獲得的子空間，第二個為傳感的個數(shù)
function J=v_j(which_subspace,which_array)
J=[zeros(which_array,which_array*(which_subspace-1)) eye(which_array) zeros(which_array,which_array*(6-which_subspace))];