20.16 Using the Jacobi and Gauss-Seidel methods, solve the system with tol = 0.5 × 10−14 and numiter = 50. In each case, print the number of iterations required and the relative residual .
20.17 This problem investigates convergence properties. The matrix is positive definite (Problem 20.10(b)).
a. Is matrix A strictly row diagonally dominant?
b. Is the Jacobi method ...