[Trilinos-Users] info on SumIntoGlobalValues for CsrFEMatrix

Williams, Alan B william at sandia.gov
Mon Feb 23 08:32:18 MST 2009 

Riccardo,

There is currently no way to indicate that certain rows/columns of matrix contributions should be discarded.

I presume the rows you want to discard have dirichlet boundary conditions in your finite-element problem?

Alan

 

> -----Original Message-----
> From: trilinos-users-bounces at software.sandia.gov 
> [mailto:trilinos-users-bounces at software.sandia.gov] On Behalf 
> Of Riccardo Rossi
> Sent: Thursday, February 19, 2009 3:14 AM
> To: trilinos-users at software.sandia.gov
> Subject: [Trilinos-Users] info on SumIntoGlobalValues for CsrFEMatrix
> 
> Dear all,
>     i have been trying, without much success, to find more info on how
> to perform a "standard FE assembly".
> 
> suppose i have the matrix
> 
> 1 2 3
> 3 4 5
> 6 7 8
> 
> i would like to sum this to a global matrix say at the indices
> 100
> -1
> 1000
> 
> with this i mean that i would like to assemble the first and third
> column as
> A(100,100) += 1
> A(100,1000)+= 3
> A(1000,100)+= 6
> A(1000,1000)+=8
> (i suppose those entries exist)
> while i would like the second row and column NOT to be assembles (i
> marked it as -1 for this reason)
> 
> I know of course that i could create a 
> temp = 1 3
>        6 8
> 
> and assemble it at the enries 100 1000 ... but this does not 
> look as the
> optimal solution
> 
> 
> does it exist any way of doing this efficiently using
> "SumIntoGlobalValues"? (something like marking with -1 as i did ... ) 
> 
> 
> thanks in advance
> Riccardo
> 
> 
> 
> 
> -  
> ________________________________________________________________
> Riccardo Rossi, Ph.D, Civil Engineer
> member of the Kratos Group: kratos.cimne.upc.es
> Centro Internacional de Métodos Numéricos en Ingeniería (CIMNE)
> Universidad Politécnica de Cataluña (UPC)
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> 
> On Sun, 2009-02-15 at 12:00 -0700,
> trilinos-users-request at software.sandia.gov wrote:
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> >    1. Re: Trilinos-Users Digest, Vol 42, Issue 5 
> (rrossi at cimne.upc.edu)
> > 
> > 
> > 
> ----------------------------------------------------------------------
> > 
> > Message: 1
> > Date: Sat, 14 Feb 2009 21:00:39 +0100 (CET)
> > From: rrossi at cimne.upc.edu
> > Subject: Re: [Trilinos-Users] Trilinos-Users Digest, Vol 42, Issue 5
> > To: trilinos-users at software.sandia.gov
> > Message-ID:
> > 	<34958.79.150.49.217.1234641639.squirrel at webmail.cimne.upc.es>
> > Content-Type: text/plain; charset=iso-8859-1
> > 
> > Hi,
> >       PyTrilinos also needs swig and numeric/numpy so you 
> also need to add
> > those packages for Ubuntu
> > 
> > greetings
> > Riccardo
> > 
> >  Send Trilinos-Users mailing list submissions to
> > > 	trilinos-users at software.sandia.gov
> > >
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> > > or, via email, send a message with subject or body 'help' to
> > > 	trilinos-users-request at software.sandia.gov
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> > > When replying, please edit your Subject line so it is 
> more specific
> > > than "Re: Contents of Trilinos-Users digest..."
> > >
> > >
> > > Today's Topics:
> > >
> > >    1. Trilinos prerequesites on Ubuntu 8.10/AMD 64 (Scott Askey)
> > >    2. Re: Trilinos prerequesites on Ubuntu 8.10/AMD 64 
> (Kurtis Nusbaum)
> > >
> > >
> > > 
> ----------------------------------------------------------------------
> > >
> > > Message: 1
> > > Date: Fri, 13 Feb 2009 03:29:08 -0800 (PST)
> > > From: "Scott Askey" <scotta_2002 at yahoo.com>
> > > Subject: [Trilinos-Users] Trilinos prerequesites on 
> Ubuntu 8.10/AMD 64
> > > To: trilinos-users at software.sandia.gov
> > > Message-ID: <534287.63163.qm at web36506.mail.mud.yahoo.com>
> > > Content-Type: text/plain; charset=us-ascii
> > >
> > > I just had to reinstall my os and lost my package list.  
> Can anyone
> > > suggest the list of pacakges I need to install on an 
> AMD_64/Ubuntu_8.10
> > > box to expedite building Nox and Pytrilinos.  In the past 
> I have had
> > > trouble selecting the correct BLAS/LAPACK/ATLAS Fortran varieties.
> > >
> > > apt-get .... ?
> > >
> > > V/R
> > >
> > > Scott
> > >
> > >
> > >
> > >
> > >
> > >
> > > ------------------------------
> > >
> > > Message: 2
> > > Date: Fri, 13 Feb 2009 12:48:39 -0600
> > > From: "Kurtis Nusbaum" <klnusbaum at gmail.com>
> > > Subject: Re: [Trilinos-Users] Trilinos prerequesites on Ubuntu
> > > 	8.10/AMD 64
> > > To: scotta_2002 at yahoo.com
> > > Cc: trilinos-users at software.sandia.gov
> > > Message-ID:
> > > 	<7b4ecb930902131048s77cb3b14x8113e8ffa680f892 at mail.gmail.com>
> > > Content-Type: text/plain; charset="iso-8859-1"
> > >
> > > I'm also running trilinos on AMD64/Ubuntu 8.10. Most of 
> the stuff you need
> > > is just in the packages gcc, g++, and gfortran. But I'm 
> pretty sure you
> > > also
> > > need the libblas-dev and liblapack-dev. So I think:
> > >
> > > sudo apt-get install gcc g++ gfortran libblas-dev liblapack-dev
> > >
> > > should take care of everything. IYou should have most of 
> these installed
> > > already any way. I think inorder to get Trilinos to 
> compile for me, the
> > > only
> > > packages I had to explicitly install was gfortran. The 
> rest were already
> > > installed for me. If you plan on using MPI you should 
> also install those
> > > packages.
> > >
> > > -Kurtis
> > >
> > > On Fri, Feb 13, 2009 at 5:29 AM, Scott Askey 
> <scotta_2002 at yahoo.com>
> > > wrote:
> > >
> > >> I just had to reinstall my os and lost my package list.  
> Can anyone
> > >> suggest
> > >> the list of pacakges I need to install on an 
> AMD_64/Ubuntu_8.10 box to
> > >> expedite building Nox and Pytrilinos.  In the past I 
> have had trouble
> > >> selecting the correct BLAS/LAPACK/ATLAS Fortran varieties.
> > >>
> > >> apt-get .... ?
> > >>
> > >> V/R
> > >>
> > >> Scott
> > >>
> > >>
> > >>
> > >>
> > >> _______________________________________________
> > >> Trilinos-Users mailing list
> > >> Trilinos-Users at software.sandia.gov
> > >> http://software.sandia.gov/mailman/listinfo/trilinos-users
> > >>
> > >>
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