Prometheus (i.e. diagonal scaling preconditioning)

Options Database Key

-pc_prometheus_rowmax -use the maximum absolute value in each row as the scaling factor, rather than the diagonal

Notes: By using KSPSetPreconditionerSide(ksp,PC_SYMMETRIC) or -ksp_symmetric_pc you can scale each side of the matrix by the squareroot of the diagonal entries.

Zero entries along the diagonal are replaced with the value 1.0

See Also

PCCreate(), PCSetType(), PCType (for list of available types), PC

Index of all PC routines
Table of Contents for all manual pages
Index of all manual pages