petsc-3.13.6 2020-09-29
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ISGetIndices

 Returns a pointer to the indices. The user should call ISRestoreIndices() after having looked at the indices. The user should NOT change the indices.

Synopsis

#include "petscis.h" 
PetscErrorCode  ISGetIndices(IS is,const PetscInt *ptr[])
Not Collective

Input Parameter

is -the index set

Output Parameter

ptr -the location to put the pointer to the indices

Fortran Note

This routine has two different interfaces from Fortran; the first is not recommend, it does not require Fortran 90 
   IS          is

   integer     is_array(1)

   PetscOffset i_is

   int         ierr

      call ISGetIndices(is,is_array,i_is,ierr)



  Access first local entry in list



     value = is_array(i_is + 1)





     ...... other code



      call ISRestoreIndices(is,is_array,i_is,ierr)


The second Fortran interface is recommended.

         use petscisdef



         PetscInt, pointer :: array(:)



         PetscErrorCode  ierr



         IS       i



         call ISGetIndicesF90(i,array,ierr)








See the Fortran chapter of the users manual and
petsc/src/is/[tutorials,tests] for details.








See Also

 ISRestoreIndices(), ISGetIndicesF90()

Level
intermediate


Location

src/vec/is/is/interface/index.c

Examples

src/vec/vec/utils/tagger/tutorials/ex1.c.html

src/vec/is/is/tutorials/ex1.c.html

src/vec/is/is/tutorials/ex2.c.html

src/vec/is/is/tutorials/ex3.c.html

src/vec/is/is/tutorials/ex1f.F.html

src/vec/is/is/tutorials/ex2f.F.html

src/dm/tutorials/swarm_ex3.c.html

src/ksp/ksp/tutorials/ex71.c.html

src/ksp/ksp/tutorials/ex76.c.html

src/snes/tutorials/ex56.c.html

src/snes/tutorials/ex77.c.html


Implementations
ISGetIndices_Block in src/vec/is/is/impls/block/block.c

ISGetIndices_General in src/vec/is/is/impls/general/general.c

ISGetIndices_Stride in src/vec/is/is/impls/stride/stride.c


Index of all IS routines

Table of Contents for all manual pages

Index of all manual pages