In incomplete Cholesky decomposition, the preconditioner matrix produced is ____________ (Note: L is the factorized lower triangular matrix and U is the factorized lower triangular matrix).(a) UL’(b) LU’(c) LL’(d) LL^2I got this question at a job interview.This intriguing question originated from Numerical Methods in section Numerical Methods of Computational Fluid Dynamics

In incomplete Cholesky decomposition, the preconditioner matrix produc

1.	In incomplete Cholesky decomposition, the preconditioner matrix produced is ____________ (Note: L is the factorized lower triangular matrix and U is the factorized lower triangular matrix).(a) UL’(b) LU’(c) LL’(d) LL^2I got this question at a job interview.This intriguing question originated from Numerical Methods in section Numerical Methods of Computational Fluid Dynamics
Answer» Right choice is (C) LL’ The explanation is: In incomplete Cholesky DECOMPOSITION, FACTORIZATION is done only for the lower triangular matrix and the preconditioner matrix is LL’. The coefficient matrix is also APPROXIMATELY equal to the preconditioner matrix.

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