| -pc_ilu_nonzeros_along_diagonal | - - -pc_lu_nonzeros_along_diagonal
|
Algorithm Notes
Column pivoting is used.
1) Choice of column is made by looking at the
non-zero elements in the troublesome row for columns that are not yet
included (moving from left to right).
2) If (1) fails we check all the columns to the left of the current row
and see if one of them has could be swapped. It can be swapped if
its corresponding row has a non-zero in the column it is being
swapped with; to make sure the previous nonzero diagonal remains
nonzero
Level:intermediate
Location:src/mat/utils/zerodiag.c
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