petsc-3.14.5 2021-03-03
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# ISCreateStride

Creates a data structure for an index set containing a list of evenly spaced integers.

### Synopsis

    #include "petscis.h"
    PetscErrorCode  ISCreateStride(MPI_Comm comm,PetscInt n,PetscInt first,PetscInt step,IS *is)

Collective

### Input Parameters

| comm | - the MPI communicator
| n | - the length of the locally owned portion of the index set
| first | - the first element of the locally owned portion of the index set
| step | - the change to the next index

### Output Parameter

| is | - the new index set

### Notes

When the communicator is not MPI_COMM_SELF, the operations on IS are NOT conceptually the same as MPI_Group operations. The IS are the distributed sets of indices and thus certain operations on them are collective.

### See Also

ISCreateGeneral(), ISCreateBlock(), ISAllGather(), ISSTRIDE

### Level

beginner

### Location

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

### Examples

src/vec/is/is/tutorials/ex2.c.html
src/vec/is/is/tutorials/ex2f.F.html
src/dm/impls/plex/tutorials/ex1f90.F90.html
src/dm/tutorials/ex6.c.html
src/ksp/ksp/tutorials/ex59.c.html
src/ksp/ksp/tutorials/ex71.c.html
src/ksp/ksp/tutorials/ex73.c.html
src/tao/pde_constrained/tutorials/elliptic.c.html
src/tao/pde_constrained/tutorials/parabolic.c.html
src/tao/pde_constrained/tutorials/hyperbolic.c.html
Index of all IS routines
Table of Contents for all manual pages
Index of all manual pages