Consider the vectors R³, and let W be the subspace span{1, 2}. a) Find an orthogonal basis for W. 3 o) Find the orthogonal projection of 7 = 1 onto W. 10 5 = --8-8

Linear Algebra: A Modern Introduction
4th Edition
ISBN:9781285463247
Author:David Poole
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Chapter7: Distance And Approximation
Section7.3: Least Squares Approximation
Problem 43EQ
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Consider the vectors
in R³, and let W be the subspace span{₁, 2}.
(a) Find an orthogonal basis for W.
3
(b) Find the orthogonal projection of y = 1 onto W.
10
(c) Find the distance from y to (the closest point in) W.
2
5
*-8--8
=
=
Transcribed Image Text:Consider the vectors in R³, and let W be the subspace span{₁, 2}. (a) Find an orthogonal basis for W. 3 (b) Find the orthogonal projection of y = 1 onto W. 10 (c) Find the distance from y to (the closest point in) W. 2 5 *-8--8 = =
For part (a), note first that the vectors 7₁ and 2 are linearly independent: there are two of them and
neither is a scalar multiple of the other. Gram-Schmidt then produces the orthogonal basis {₁, 2} =
2
{GB]}
For part (b), the orthogonal projection formula gives
3
y-v₂
projwy =
-U₁ +
-9/2
V₁ V1
02 - 02
9/2
Finally, for part (c), the distance is || - projwy|| = || |11/2| || = ¹12
11/2
-√₂
=
Transcribed Image Text:For part (a), note first that the vectors 7₁ and 2 are linearly independent: there are two of them and neither is a scalar multiple of the other. Gram-Schmidt then produces the orthogonal basis {₁, 2} = 2 {GB]} For part (b), the orthogonal projection formula gives 3 y-v₂ projwy = -U₁ + -9/2 V₁ V1 02 - 02 9/2 Finally, for part (c), the distance is || - projwy|| = || |11/2| || = ¹12 11/2 -√₂ =
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