inclass9-system-cost

# inclass9-system-cost - [1/7 Constructing an LU...

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3/15/2016 [1/7] Constructing an LU Factorization - In-class work: Solver Costs - RELATE 1/1 Constructing an LU Factorization Let be a matrix. What is the cost (or timing relationship with ) of constructing an factorization with partial pivoting. A Rn×n n LU Choice* O(1) O(n) O(nlog±n) O(n2) O(n3) None of these

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3/15/2016 [2/7] Given an LU Factorization - In-class work: Solver Costs - RELATE 1/1 Given an LU Factorization Let be a matrix. Suppose that we have computed an factorization of and have stored the elements of , , and . What is the cost of solving ? A Rn×n LU A n×n L U P Ax=b Choice* O(1) O(n) O(nlog±n) O(n2) O(n3) None of these
3/15/2016 [3/7] Triangular A - In-class work: Solver Costs - RELATE 1/1 Triangular A Let be a matrix that is Upper Triangular.

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