[Trilinos-Users] problems with transpose, inverse and products with Epetra_CRSMatrix

[Alicia Marie Klinvex]

Hello Antonella and Deepak,

The matrix multiplication is in the EpetraExt package: http://trilinos.org/docs/dev/packages/epetraext/doc/html/classEpetraExt_1_1MatrixMatrix.html

I believe the transpose function you seek is also in EpetraExt: http://trilinos.org/docs/dev/packages/epetraext/doc/html/classEpetraExt_1_1RowMatrix__Transpose.html
(I could be wrong about that one; I've never used that particular function before.)

The matrix vector multiplication is in Epetra (called Apply): http://trilinos.org/docs/dev/packages/epetra/doc/html/classEpetra__CrsMatrix.html#a77c4232f1b3d32ff76504ed314df5f76

Do you absolutely need to compute the inverse of your matrix, or do you just want to apply the inverse to a vector?  I'm afraid I don't know whether Trilinos even has a function to invert a sparse matrix, but if you were only interested in solving linear systems, it certainly has functions for that.

Best wishes,
Alicia Klinvex



----- Original Message -----
From: "Antonella Longo" <longo at pi.ingv.it>
To: trilinos-users at software.sandia.gov
Cc: "Deepak Garg" <deepak.garg at pi.ingv.it>
Sent: Wednesday, September 10, 2014 9:10:46 AM
Subject: [Trilinos-Users] problems with transpose,	inverse and products with Epetra_CRSMatrix

We are making computations with Epetra_CRSMatrices,
but we could not find any mathematical functions for 
these matrices.
In particular we need to compute the transpose and 
the inverse of an Epetra_CRSMatrix, to calculate
the product of two Epetra_CRSMatrices, and the 
product of an Epetra_CRSMatrix with an Epetra_Vector.
Does there exist any standard functions for these operations?
We checked the functions of the above mentioned classes but we found
nothing. 

Thanks for your kind attention.

Antonella Longo and Deepak Garg



-----------------------------------------------
Antonella Longo
Istituto Nazionale di Geofisica e Vulcanologia
Sezione di Pisa
Via Uguccione della Faggiola, 32
Pisa, Italy
Tel. office: 050 8311939
Cell.: 339 7532089

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