Chapter 5: Problem 7
Find the distance from the point (1,2) to the line \(4 x-3 y=0\)
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Chapter 5: Problem 7
Find the distance from the point (1,2) to the line \(4 x-3 y=0\)
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Use the Gram-Schmidt process to find an orthonormal basis for the subspace of \(\mathbb{R}^{4}\) spanned by \(\mathbf{x}_{1}=(4,2,2,1)^{T}, \mathbf{x}_{2}=(2,0,0,2)^{T}, \mathbf{x}_{3}=\) \((1,1,-1,1)^{T}\)
In \(\mathbb{R}^{n}\) with inner product $$\langle\mathbf{x}, \mathbf{y}\rangle=\mathbf{x}^{T} \mathbf{y}$$ derive a formula for the distance between two vectors \(\mathbf{x}=\left(x_{1}, \ldots, x_{n}\right)^{T}\) and \(\mathbf{y}=\left(y_{1}, \ldots, y_{n}\right)^{T}\)
How many \(n \times n\) permutation matrices are there?
Show that $$\|\mathbf{x}\|_{1}=\sum_{i=1}^{n}\left|x_{i}\right|$$ defines a norm on \(\mathbb{R}^{n}\)
Let \(x_{1}, x_{2}, \ldots, x_{n}\) be distinct points in the interval [-1,1] and let $$A_{i}=\int_{-1}^{1} L_{i}(x) d x, \quad i=1, \ldots, n$$ where the \(L_{i}\) 's are the Lagrange functions for the points \(x_{1}, x_{2}, \ldots, x_{n}\) (a) Explain why the quadrature formula $$\int_{-1}^{1} f(x) d x=A_{1} f\left(x_{1}\right)+\cdots+A_{n} f\left(x_{n}\right)$$ will yield the exact value of the integral whenever \(f(x)\) is a polynomial of degree less than \(n\) (b) Apply the quadrature formula to a polynomial of degree 0 and show that $$A_{1}+A_{2}+\cdots+A_{n}=2$$
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