(Optional) Set relaxation type
(Optional) Set relaxation type.Current relaxation methods set by relax_type are:
\begin{tabular}{l@{ -- }l} 0 & Jacobi
1 & Weighted Jacobi (default)
2 & Red/Black Gauss-Seidel (symmetric: RB pre-relaxation, BR post-relaxation)
3 & Red/Black Gauss-Seidel (nonsymmetric: RB pre- and post-relaxation)
alphabetic index hierarchy of classes
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