11.7 Inverse of an upper triangular matri. Suppose the n × n matrix R is upper triangular and inv...
2. (10 mk) Let A 0 debe an upper triangular matrix with nonzero entries a, b, c, d, o0 f e, (a) (5 mk) Find the inverse of A. (b) (5 mk) Suppose the columns of A are eigenvectors of a matrix B. Prove that B is also upper triangular.
(d) Show that if L E Mn is upper triangular, th LL, and argue that IAgIP-lAollF, where IIA]IF、/tr(ATA) represents the Frobenius norm of A, and tr(A)-Σ.1 A" is the trace of A. (e) Assu me that an upper triangular matrix L has the block structure し11 し12 0 In with the size of the Ln blook being m × m. Let A-LTL, and λ = LLT. Show that tr(A (1 : m, 1 : m))-tr(A(1 : m, 1 : m))...
(a) Suppose we want to solve the linear vector-matrix equation Ax b for the vector x. Show that the Gauss elimination algorithm may be written bAbm,B where m 1, This process produces a matrix equation of the form Ux = g , in which matrix U is an upper-triangular matrix. Show that the solution vector x may be obtained by a back-substitution algorithm, in the form Jekel (b) Iterative methods for solving Ax-b work by splitting matrix A into two...
Please answer # 22 and 24 hapter 1 Systems of Linear Equations and Matrices *21. Suppose that A is n × m and B is m × n so that AB is n × n. Show that AB is no invertible if n> m. [Hint: Show that there is a nonzero vector x such that AB then apply Theorem 6.] and 22.) Use the methods of this section to find the inverses of the following matrices complex entries: 1- 0...
2. in problem 5.25 b) I can not solve this problem thank you Review Exercises 309 (c) Why is eA unitary? (d) Why is eKt unitary? 5.21 (a) Find a nonzero matrix N such that N3 0. (b) If Nx = Ax, show that λ must be zero. (c) Prove that N (called a "nilpotent" matrix) cannot be symmetric 5.22 Suppose the first row of A is 7, 6 and its eigenvalues are i, -i. Find A. 5.23 If the...
Differention Equations - Can someone answer the checked numbers please? Determinants 659 is the characteristic equation of A with λ replaced by /L we can multiply by A-1 to get o get Now solve for A1, noting that ao- det A0 The matrix A-0 22 has characteristic equation 0 0 2 2-A)P-8-12A +62- 0, so 8A1-12+6A -A, r 8A1-12 Hence we need only divide by 8 after computing 6A+. 23 1 4 12 10 4 -64 EXERCISES 1. Find AB,...
In this exercise you will work with LU factorization of an matrix A. Theory: Any matrix A can be reduced to an echelon form by using only row replacement and row interchanging operations. Row interchanging is almost always necessary for a computer realization because it reduces the round off errors in calculations - this strategy in computer calculation is called partial pivoting, which refers to selecting for a pivot the largest by absolute value entry in a column. The MATLAB...
12.3 Least angle property of least squares. Suppose the m × n matrix A has linearly independent columns, and b is an m-vector. Let x ATb denote the least squares approximate solution (a) Show that for any n-vector a, (Ax)Tb - (Aa)"(Aâ), i.e., the inner product of Ax and b is the same as the inner product of Ax and Ai. Hint. Use (Ax)b (ATb) and (ATA)2 = ATb (b) Show that when A and b are both nonzero, we...
4. Suppose that A Rnn is nonsingular. We can pose the problem of finding A-1 as the system of linear equations where X e R" is the unknown inverse matrix. We assume that A has LU factorization A LU (a) Explain how we can use the LU factorization of A and the ear system (4.1.1) to calculate the inverse A-1 Hint: The system (4.1.1) is a system of n × n equations and n × n unknowns. Consider the linear...
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