petsc-3.10.5 2019-03-28
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# PetscSection

Mapping from integers in a designated range to contiguous sets of integers.

### Synopsis

    typedef struct _p_PetscSection *PetscSection;

In contrast to IS, which maps from integers to single integers, the range of a PetscSection is in the space of contiguous sets of integers. These ranges are frequently interpreted as domains of other array-like objects, especially other PetscSections, Vecs, and ISs. The domain is set with PetscSectionSetChart() and does not need to start at 0. For each point in the domain of a PetscSection, the output set is represented through an offset and a count, which are set using PetscSectionSetOffset() and PetscSectionSetDof() respectively. Lookup is typically using accessors or routines like VecGetValuesSection().

### See Also

PetscSectionCreate(), PetscSectionDestroy()

### Level

developer

### Location

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

### Examples

src/ts/examples/tutorials/ex11.c.html

### Implementations

_p_PetscSection in include/petsc/private/isimpl.h
Index of all IS routines
Table of Contents for all manual pages
Index of all manual pages