Let A = LU, where L is lower triangular with 1s on the diagonal and U is upper
Chapter 7, Problem 9(choose chapter or problem)
Let A = LU, where L is lower triangular with 1s on the diagonal and U is upper triangular. (a) How many scalar additions and multiplications are necessary to solve Ly = ej by forward substitution? (b) How many additions/subtractions and multiplications/ divisions are necessary to solve Ax = ej ? The solution xj of Ax = ej will be the j th column of A1. (c) Given the factorization A = LU, how many additional multiplications/ divisions and additions/ subtractions are needed to compute A1? 1
Unfortunately, we don't have that question answered yet. But you can get it answered in just 5 hours by Logging in or Becoming a subscriber.
Becoming a subscriber
Or look for another answer