QR Decomposition 觀念題

Question

If A=[1 3; 2 6], then A has the QR Decomposition. Ture or False

Note: A is singular matrix.

Answer 1

你的題目是英文還是數學呢?
如果是:If A=[1 3; 2 6], then A has the QR Decomposition.答案是:False
如果是:If A=[1 3; 2 6], then A has a QR Decomposition. 答案是: True
A=[1 3; 2 6]= [1/√5 2/√5; 2/√5 -1/√5] *[√5 3√5; 0 0]
=[-1/√5 2/√5;-2/√5 -1/√5]*[-√5 -3√5; 0 0]