petsc-3.7.7 2017-09-25

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 on MPI_Comm

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.

Examples