***************************** Matrix Factorization Save ***************************** :: Matrix factorization save = {0 | 1} ----------------------- Description / Usage ----------------------- This optional card is a boolean specification that determines whether the preconditioner factorization information should be kept after a solve. Valid options are 0 Factorization information is discarded. 1 Factorization information is kept for that step. If the *Matrix factorization save* card is omitted, then the default selection is **0.** ------------ Examples ------------ Following is a sample card: :: Matrix factorization save = 1 ------------------------- Technical Discussion ------------------------- This option is most useful for iterative solution techniques where the computed preconditioning matrix found from an incomplete factorization requires significant computational resources. Such a preconditioner may be useful in later matrix solves and obviate the need to compute another expensive preconditioner at the later stage. Although a lot of time may be saved by re-using a previous factorization, the loss in accuracy may cause convergence problems.