問題詳情

5.10% Let A be a m x n matrix with rank n and column space

. For any vector b in Rm,we say that the projection of b onto the column space 

 is Ax if the Euclidean distance ||b - At|| for any t in Rn is minimized wfien t = x.
【題組】(a)Find the solution x such that Ax is the projection of b onto 

. (Hint： Differentiate (b - Ax)T(b - Ax) with respect to the vector x to have an equation.)

參考答案

答案：B
難度：簡單0.87775
統計：A(55),B(2434),C(271),D(13),E(0) #
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政策監測:製造公共政策因果關係資訊的政策分析過程，透過政策監測活動，可使政策分析人員描述政策計畫實施情況與結果關係；亦即描述與解釋公共政策執行情形。來源:國考大師教你看圖學會行政學(104年版)P.193  楊銘編著