Research Article
Different Versions of ILU and IUL Factorizations Obtained from Forward and Backward Factored Approximate Inverse ProcessesβPart I
Algorithm 2
IULBF algorithm.
(1) . | (2) forββ to 1 do | (3) β. | (4) βfor to ββdo | (5) ββ | (6) ββapply a dropping rule to and to | (7) ββ | (8) ββfor all apply a dropping rule to and to | βββ (first format of dropping for and ) | (9) ββend for | (10)βfor all apply a dropping rule to and to | βββββ(second format of dropping for and ) | (11) β (if is not positive definite) | (12) β (if is positive definite) | (13) end for | (14) Return and |
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