|-pc_jacobi_rowmax||- use the maximum absolute value in each row as the scaling factor, rather than the diagonal|
|-pc_jacobi_abs||- use the absolute value of the diagaonl entry|
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
Index of all PC routines
Table of Contents for all manual pages
Index of all manual pages