Question

What does the letter ‘I’ stand for in ILU decomposition problem?

(a) Inbuilt

(b) Incomplete

(c) Iterative

(d) Imbalanced

I had been asked this question by my college professor while I was bunking the class.

This intriguing question comes from Numerical Methods topic in portion Numerical Methods of Computational Fluid Dynamics

Answer 1

The correct choice is (b) Incomplete

For explanation I would say: ILU means Incomplete LU decomposition method. This does incomplete factorization of the coefficient matrix into upper and lower triangular matrices. The L and U matrices have the same number of non-zero elements as in the lower and upper parts of A.