→ Yuchin1992 :我的想法有點笨，把P求出來再檢查 06/11 20:26
→ Yuchin1992 :P = A(A^T A)^(-1) A^T 06/11 20:26
推 aegius1r :R3中至少有兩個不平行的向量跟(1 1 1)^T垂直 06/11 22:11
→ yhliu :rank(P) = 1, 故 nullity(P)=2. 06/12 02:06
→ yhliu :P 不一定是垂直投影矩陣. 06/12 02:07
if P_3*3 is a projection matrix that projects any vector in R^3 onto the
vector u=[1 1 1]^T, then there must be two eigenvectors that correspond to
the eigenvalue of 0
書上寫ture
請問為什麼呢?
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