[理工] 線代QR分解觀念釐清
第一個問題 :什麼條件才能做QR
看過兩種版本
1,任何A矩陣皆可
2,A之col vector要linear indepentdent
個人比較偏1
第二個問題:Ax=b利用QR解lss
整理後會變成x=R^-1Q^tb
解答:A未必可逆,故R未必可逆
用常理想一下R不是上三角矩陣嗎?必定可逆吧 ?
求高手解惑 感謝
手機排版抱歉
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