[Trilinos-Users] Trilinos-Users Digest, Vol 38, Issue 13

[Heroux, Michael A]

Riccardo,

We do not generally support this model of construction in our concrete data class since maps are often shared and resizing them would create a very complicated dependency graph with unintended and confused consequences.

Howver, you can use the Teuchos Reference Counted Pointer (RCP) to accomplish what you want in a similar fashion.  You can create a Null valued RCP for each object you will eventually construct, then assign a concrete FECrsMatrix and Vector pointer to the RCP when you actually want to create one of these objects with the appropriate sizes and data.  Resizing can occur by creating a new FECrsMatrix or Vector object and assigning its pointer to the RCP, which will properly delete the old one.

This approach is desirable from a few perspectives and should give you the functional model you like.

I hope this helps.

Mike


On 10/17/08 4:12 AM, "Riccardo Rossi" <rrossi at cimne.upc.edu> wrote:

dear all,

I am trying to write an interface to use the trilinos linear algebra
within my code.

unfortunately i am currently relying on the presence of an empty
constructor for my Matrix and Vector classes which i then "resize" (read
create a new object with the correct size and assign it to the first)
when i arrive to know the size and distribution across the processors
they are supposed to have.

The Epetra_FECrsMAtrix and Vector do not have such a constructor. I am
planning to construct them with an "empty" map, meaning a map with 0
global elements. ... does anyone know if this approach is likely to work

any comment or suggestion is welcome

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)
Edificio C-1, campus Norte UPC
Gran Capitan, s/n
08034 Barcelona, España
Tel. (+34) 93 401 73 99
________________________________________________________________





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