MIT線性代數筆記-第十五講

Projections! aT(b−xa)=0 a T ( b − x a ) = 0 xaTa=aTb x a T a = a T b x=aTbaTa x = a T b a T a p=ax=aaTbaTa p = a x = a a T b a T a 投影矩陣爲: P=aTbaTa P = a T b a T a (注意，大P，代表矩陣) PT=P P T = P P2=P(投影兩次得到

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