MATIS#
MATIS = “is” - A matrix type to be used for non-overlapping domain decomposition methods (e.g. PCBDDC or KSPFETIDP). This stores the matrices in globally unassembled form and the parallel matrix vector product is handled “implicitly”.
Options Database Keys#
-mat_type is - Set the matrix type to
MATIS.-mat_is_allow_repeated - Allow repeated entries in the local part of the local to global maps.
-mat_is_fixempty - Fix local matrices in case of empty local rows/columns.
-mat_is_storel2l - Store the local-to-local operators generated by the Galerkin process of
MatPtAP().
Notes#
Options prefix for the inner matrix are given by -is_mat_xxx
You must call MatSetLocalToGlobalMapping() before using this matrix type.
You can do matrix preallocation on the local matrix after you obtain it with
MatISGetLocalMat(); otherwise, you could use MatISSetPreallocation() or MatXAIJSetPreallocation()
See Also#
Matrices, Mat, MATIS, Mat, MatISGetLocalMat(), MatSetLocalToGlobalMapping(), MatISSetPreallocation(), MatCreateIS(), PCBDDC, KSPFETIDP
Level#
intermediate
Location#
Examples#
src/ksp/ksp/tutorials/ex59.c
src/ksp/ksp/tutorials/ex29.c
src/ksp/ksp/tutorials/ex71.c
src/snes/tutorials/ex12.c
src/ksp/ksp/tutorials/ex72.c
src/ksp/ksp/tutorials/ex34.c
Index of all Mat routines
Table of Contents for all manual pages
Index of all manual pages