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<div id="version" align=right><b>petsc-3.7.5 2017-01-01</b></div>
<div id="bugreport" align=right><a href="mailto:petsc-maint@mcs.anl.gov?subject=Typo or Error in Documentation &body=Please describe the typo or error in the documentation: petsc-3.7.5 v3.7.5 docs/manualpages/IS/PetscSection.html "><small>Report Typos and Errors</small></a></div>
<A NAME="PetscSection"><H1>PetscSection</H1></A>
Mapping from integers in a designated range to contiguous sets of integers.
<H3><FONT COLOR="#CC3333">Synopsis</FONT></H3>
<PRE>
typedef struct _p_PetscSection *<A HREF="../IS/PetscSection.html#PetscSection">PetscSection</A>;
</PRE>
In contrast to <A HREF="../IS/IS.html#IS">IS</A>, which maps from integers to single integers, the range of a <A HREF="../IS/PetscSection.html#PetscSection">PetscSection</A> is in the space of
contiguous sets of integers. These ranges are frequently interpreted as domains of other array-like objects,
especially other PetscSections, <A HREF="../Vec/Vecs.html#Vecs">Vecs</A>, and ISs. The domain is set with <A HREF="../IS/PetscSectionSetChart.html#PetscSectionSetChart">PetscSectionSetChart</A>() and does not need to
start at 0. For each point in the domain of a <A HREF="../IS/PetscSection.html#PetscSection">PetscSection</A>, the output set is represented through an offset and a
count, which are set using <A HREF="../IS/PetscSectionSetOffset.html#PetscSectionSetOffset">PetscSectionSetOffset</A>() and <A HREF="../IS/PetscSectionSetDof.html#PetscSectionSetDof">PetscSectionSetDof</A>() respectively. Lookup is typically using
accessors or routines like VecGetValuesSection().
<P>
<P>
<H3><FONT COLOR="#CC3333">See Also</FONT></H3>
<A HREF="../IS/PetscSectionCreate.html#PetscSectionCreate">PetscSectionCreate</A>(), <A HREF="../IS/PetscSectionDestroy.html#PetscSectionDestroy">PetscSectionDestroy</A>()
<BR><P><B><P><B><FONT COLOR="#CC3333">Level:</FONT></B>developer
<BR><FONT COLOR="#CC3333">Location:</FONT></B><A HREF="../../../src/vec/is/is/../../../../include/petscistypes.h.html#PetscSection">src/vec/is/is/../../../../include/petscistypes.h</A>
<BR><A HREF="./index.html">Index of all IS routines</A>
<BR><A HREF="../../index.html">Table of Contents for all manual pages</A>
<BR><A HREF="../singleindex.html">Index of all manual pages</A>
<P><H3><FONT COLOR="#CC3333">Examples</FONT></H3>
<A HREF="../../../src/ts/examples/tutorials/ex11.c.html">src/ts/examples/tutorials/ex11.c.html</A><BR>
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