Find the orthogonal projection

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Reference no: EM132400447

Question 1: An inner product on R3 is given by

147_product.jpg

(x1+x2+x3)(y1+y2+y3)+(x1+2x2+4x3)(y1+2y2+4y3)+(x1+3x2+9x3)(y1+3y2+9y3).

(a) Verify that this inner product is commutative, linear in each coordinate, and positive definite.

(b) Using this inner product instead of the dot product, find an orthonormal basis for R3 using the corresponding analogue of Gram-Schmidt.

(c) Let W be the subspace of R3 consisting of all vectors in the plane

x + y + z = 0.

Find ω ∈ W minimizing

1844_product1.jpg

where the magnitude of any vector v ∈ R3 is defined to be √(v, v).

Question 2. Let V be equal to the vector space of integrable real-valued functions with domain [-1, 1]. An inner product on V is given by

(f, g) = ∫-11 f(x)g(x) dx.

(a) Let W be the subspace of V spanned by f0, f1, f2, and f3, where f0(x) = 1, f1(x) = cos(πx), f2(x) = cos(2πx), f3(x) = cos(3πx). Find an orthonormal basis for W with respect to the given inner product.

(b) Let f ∈ V be the function defined by f (x) = x2. Find the orthogonal projection of f onto W with respect to the given inner product, then plot both functions in the same coordinate system.

Reference no: EM132400447

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