Let Determine P and Q as in Exercise 27, and compute Px and Qx. The figure shows
Question:
Let
Determine P and Q as in Exercise 27, and compute Px and Qx. The figure shows that Qx is the reflection of x through the x1x2-plane.
A Householder reflection through the plane x3 = 0.
Data from in Exercise 27
Given u in Rn with uTu = 1, let P = uuT (an outer product) and Q = I - 2P. Justify statements,
(a) P2 = P
(b) PT = P
(c) Q2 = 1
The transformation x ↦ Px is called a projection, and x ↦ Qx is called a Householder reflection. Such reflections are used in computer programs to create multiple zeros in a vector (usually a column of a matrix).
Transcribed Image Text:
u 0 0 and x = 1 1 53 3
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Related Book For
Linear Algebra And Its Applications
ISBN: 9781292351216
6th Global Edition
Authors: David Lay, Steven Lay, Judi McDonald
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