MatOrderingType#

String with the name of a PETSc matrix ordering. These orderings are most commonly used to reduce fill in sparse factorizations.

Synopsis#

typedef const char *MatOrderingType;
#define MATORDERINGNATURAL       "natural"
#define MATORDERINGND            "nd"
#define MATORDERING1WD           "1wd"
#define MATORDERINGRCM           "rcm"
#define MATORDERINGQMD           "qmd"
#define MATORDERINGROWLENGTH     "rowlength"
#define MATORDERINGWBM           "wbm"
#define MATORDERINGSPECTRAL      "spectral"
#define MATORDERINGAMD           "amd"           /* only works if UMFPACK is installed with PETSc */
#define MATORDERINGMETISND       "metisnd"       /* only works if METIS is installed with PETSc */
#define MATORDERINGNATURAL_OR_ND "natural_or_nd" /* special coase used for Cholesky and ICC, allows ND when AIJ matrix is used but Natural when SBAIJ is used */
#define MATORDERINGEXTERNAL      "external"      /* uses an ordering type internal to the factorization package */

Notes#

If MATORDERINGEXTERNAL is used then PETSc does not compute an ordering and instead the external factorization solver package called utilizes one of its own.

There is no MatOrdering object, the ordering is obtained directly from the matrix with MatGetOrdering()

Developer Note#

This API should be converted to an API similar to those for MatColoring and MatPartitioning

Level#

beginner

Location#

include/petscmat.h

Examples#

src/mat/tutorials/ex1.c
src/ksp/ksp/tutorials/ex10.c

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