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To save computional time it is important to take a symetric preconditioner. This can be Jacobi, symmetric Gauss-Seidel or Symmetric Successive Over Relaxation (SSOR).
The simplest preconditioner is a diagonal matrix that has just the diagonal elements of <math>A</math>. This is known as Jacobi preconditioning or diagonal scaling. Since diagonal matrices are trivial to invert and store in memory, a diagonal preconditioner is a good starting point. More sophisticated choices must trade-off the reduction in <math>\kappa(A)</math>, and hence faster convergence, with the time spent computing <math>P^{-1}</math>.
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