[線代] projection matrix 一點不懂
我現在念到要把一個 b 在一個 plane 上做 projection
b 在平面上的 projection 稱為 p
p = P*b (P is the projection matrix)
If A is a square and invertable matrix, then if I'm
projecting b onto the whole space of A, b is already in in the column space
of A, and the projection is the identity matrix.
為什麼說 b 已經是 A 的 column space 且 p 就是 I?
希望解釋不要太難懂 謝謝:)
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