Math 170A Practice Midterm Questions
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Math 170A Practice Midterm Questions
1. Given two matrices A, B ∈ Rn×n and two vectors x,y ∈ Rn, write a column oriented algorithm to compute the product s = Ax + By.
2. Decide whether the matrix is positive definite or not. If yes, find aCholesky
factorization A = RTR, with R upper triangular and having positive diagonals; if no, explain the reasons.
3. Decide whether the matrix
has an LU factorization or not. If no, give reasons; if yes, find a unit lower triangular matrix L and an upper triangular matrix U such that A = LU.
4. Let matrix Find nonzero vectors b,δb,x,δx such that Ax = b, A(x+δx) =
b + δb and is maximum.
2023-09-09