Question

Which of these statements is incorrect about iterative methods?

(a) Low computational cost

(b) Low computer storage

(c) Not suitable for sparse matrices

(d) Needs initial guess

This question was addressed to me by my school teacher while I was bunking the class.

My question comes from Numerical Methods topic in division Numerical Methods of Computational Fluid Dynamics

Answer 1

Right option is (c) Not suitable for sparse matrices

Easiest explanation: Iterative methods are chosen when the coefficient matrix is sparse (less non-zero elements). They need less storage and less computational cost. They start the solution from an initial guess and proceed to find the answer from this initial guess.