petsc-3.12.5 2020-03-29

ISGlobalToLocalMappingApplyIS

Creates from an IS in the global numbering a new index set using the local numbering defined in an ISLocalToGlobalMapping context.

#include "petscis.h"  
PetscErrorCode  ISGlobalToLocalMappingApplyIS(ISLocalToGlobalMapping mapping,ISGlobalToLocalMappingMode type,IS is,IS *newis)

Not collective

	mapping	- mapping between local and global numbering
	type	- IS_GTOLM_MASK - maps global indices with no local value to -1 in the output list (i.e., mask them) IS_GTOLM_DROP - drops the indices with no local value from the output list
	is	- index set in global numbering

newis -index set in local numbering

The output IS will be sequential, as it encodes a purely local operation

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