PETSc version 3.17.4
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# MatOption

Options that may be set for a matrix and its behavior or storage

### Synopsis

    typedef enum {MAT_OPTION_MIN = -3,
                  MAT_UNUSED_NONZERO_LOCATION_ERR = -2,
                  MAT_ROW_ORIENTED = -1,
                  MAT_SYMMETRIC = 1,
                  MAT_STRUCTURALLY_SYMMETRIC = 2,
                  MAT_FORCE_DIAGONAL_ENTRIES = 3,
                  MAT_IGNORE_OFF_PROC_ENTRIES = 4,
                  MAT_USE_HASH_TABLE = 5,
                  MAT_KEEP_NONZERO_PATTERN = 6,
                  MAT_IGNORE_ZERO_ENTRIES = 7,
                  MAT_USE_INODES = 8,
                  MAT_HERMITIAN = 9,
                  MAT_SYMMETRY_ETERNAL = 10,
                  MAT_NEW_NONZERO_LOCATION_ERR = 11,
                  MAT_IGNORE_LOWER_TRIANGULAR = 12,
                  MAT_ERROR_LOWER_TRIANGULAR = 13,
                  MAT_GETROW_UPPERTRIANGULAR = 14,
                  MAT_SPD = 15,
                  MAT_NO_OFF_PROC_ZERO_ROWS = 16,
                  MAT_NO_OFF_PROC_ENTRIES = 17,
                  MAT_NEW_NONZERO_LOCATIONS = 18,
                  MAT_NEW_NONZERO_ALLOCATION_ERR = 19,
                  MAT_SUBSET_OFF_PROC_ENTRIES = 20,
                  MAT_SUBMAT_SINGLEIS = 21,
                  MAT_STRUCTURE_ONLY = 22,
                  MAT_SORTED_FULL = 23,
                  MAT_FORM_EXPLICIT_TRANSPOSE = 24,
                  MAT_OPTION_MAX = 25} MatOption;

Any additions/changes here MUST also be made in include/petsc/finclude/petscmat.h Any additions/changes here must also be made in src/mat/interface/dlregismat.c in MatOptions[]

### Developer Notes

Entries that are negative need not be called collectively by all processes.

### See Also

MatSetOption()

### Level

beginner

### Location

src/mat/../../include/petscmat.h

### Examples

src/mat/tutorials/ex4.c.html
src/mat/tutorials/ex10.c.html
src/mat/tutorials/ex12.c.html
src/mat/tutorials/ex16.c.html
src/mat/tutorials/ex4f.F90.html
src/mat/tutorials/ex5cu.cu.html
src/ksp/pc/tutorials/ex3.c.html
src/ksp/ksp/tutorials/ex2.c.html
src/ksp/ksp/tutorials/ex4.c.html
src/ksp/ksp/tutorials/ex5.c.html
src/ksp/ksp/tutorials/ex6.c.html
Index of all Mat routines
Table of Contents for all manual pages
Index of all manual pages