[Trilinos-Users] Epetra Vectors/Maps

Williams, Alan B william at sandia.gov
Fri Jan 29 16:53:08 MST 2010

Hi John,

Yes you can have vectors/maps that overlap in the way that you describe. We have finite-element codes that use epetra in exactly that way.


> -----Original Message-----
> From: trilinos-users-bounces at software.sandia.gov [mailto:trilinos-
> users-bounces at software.sandia.gov] On Behalf Of John Mitchell
> Sent: Friday, January 29, 2010 4:38 PM
> To: trilinos-users at software.sandia.gov
> Subject: [Trilinos-Users] Epetra Vectors/Maps
> I am new to the use of Epetra and have a couple basic questions that
> don't appear to be directly addressed in the tutorial.
> Is it possible to create an
> Epetra_Map(numGlobalElements,numMyElements,myElements,0,comm)
> where sum(numMyElements) over all processors != numGlobalElements?
> What I have, is a list of ids that I own, and then a list of ids that I
> share but don't own.  I need to do parallel calculations and assemblies
> on a vector that is of length numOwned+numShared.  Assembly operations
> for both owned and shared may require off-processor communications.  I
> have a vector f = {f_owned, f_shared}; If a point that is owned on
> processor is shared on another processor, then the assembly of f_owned
> will require contributions f_shared from the sharing off processor
> I was planning on using the above Epetra_Map as a target map for
> creating an Epetra_Import -- does that make sense?
> Thanks,
> John
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