**petsc-3.9.4 2018-09-11**

# PetscSectionSym

Symmetries of the data referenced by a PetscSection.
### Synopsis

typedef struct _p_PetscSectionSym *PetscSectionSym;

Often the order of data index by a PetscSection is meaningful, and describes additional structure, such as points on a
line, grid, or lattice. If the data is accessed from a different "orientation", then the image of the data under
access then undergoes a symmetry transformation. A PetscSectionSym specifies these symmetries. The types of
symmetries that can be specified are of the form R * P, where R is a diagonal matrix of scalars, and P is a permutation.

### See Also

PetscSectionSymCreate(), PetscSectionSymDestroy(), PetscSectionSetSym(), PetscSectionGetSym(), PetscSectionSetFieldSym(), PetscSectionGetFieldSym(), PetscSectionGetSymPoints()

### Level

developer

### Location

src/vec/is/is/../../../../include/petscistypes.h
### Implementations

_p_PetscSectionSym in include/petsc/private/isimpl.h

Index of all IS routines

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