Introduction

DIDASKO, the tutorial of Trilinos, offers a quick overview of Trilinos. The reader can find a variety of examples on several Trilinos packages. Each example is documented with comments and suggestions, some in the source file itself, and some others in the PDF document. The PDF version of the tutorial can be found in the Trilinos web page.

Usually, a Trilinos package interoperates with other Trilinos packages (and with external packages as well). To be used efficiently, the examples of DIDASKO would require the following compilation flags:

--enable-epetra --enable-aztecoo --enable-amesos --enable-anasazi \
--enable-ifpack --enable-ml --enable-nox --enable-teuchos \
--enable-triutils

Most of the required packages are enabled by default. No example can effectively run without Epetra, and most require AztecOO and Triutils (this latter to generate the linear system matrix).

All the Didasko examples include, as first header file, the file

#include "Didasko_ConfigDefs.h"

Then, the code checks for installed libraries, like for instance

#if defined(HAVE_DIDASKO_EPETRA)

In the following, we report the source code of each of the examples. Packages are reported in alphabetical order.

Amesos

Basic usage of Amesos: amesos_ex1

Anasazi Examples

Computation of the lowest eigenvalues and the corresponding eigenvectors of a symmetric matrix using a Block Krylov Schur solver: anasazi_ex1
Computation of the lowest eigenvalues and the corresponding eigenvectors of a symmetric matrix using a Block Davidson solver: anasazi_ex2
Computation of the lowest eigenvalues and the corresponding eigenvectors of a nonsymmetric matrix using a Block Krylov Schur solver: anasazi_ex3
Computation of the lowest eigenvalues and the corresponding eigenvectors of a symmetric matrix using an LOBPCG solver: anasazi_ex4

Epetra Examples

Basic usage of communicators: epetra_ex1
Definition of Epetra_Map objects: epetra_ex2
Definition of vectors: epetra_ex3
Definition of serial dense vectors: epetra_ex4
Basic operations on vectors. Work on the element vectors: epetra_ex5
Use of ExtractView of Epetra_Vector: epetra_ex6
Example of Epetra_MultiVector; use of ExtractView on MultiVector: epetra_ex7
Epetra_Vectors in View mode; use of ResetView: epetra_ex8
Epetra_Export classes: epetra_ex9
Definition of dense serial matrices: epetra_ex10
Basic definition of communicators: epetra_ex11
Creation of a tridiagonal matrix: epetra_ex12
Simple FE code: epetra_ex13
Print out some information about an Epetra_CrsMatrix: epetra_ex14
Output an Epetra_CrsMatrix in MATLAB format: epetra_ex15
Output a vector in MATLAB format: epetra_ex16
Construct an Epetra_VrbMatrix: epetra_ex17
Basic operations on vectors: epetra_ex18
Create an Epetra_CrsMatrix corresponding to a 2D Laplacian problem on a cartesian mesh: epetra_ex19
Example of use of Epetra_Time and Epetra_Flops: epetra_ex20
Use of Epetra_Operator: epetra_ex21, epetra_ex22
Use of Epetra_FECrsMatrix: epetra_ex23
Show the usage of RowMap, ColumnMap, RangeMap and DomainMap: epetra_ex24

EpetraExt Examples

Generate a matrix using triutils and redistribute with Zoltan: epetraext_ex1
Generate a linearproblem using triutils and redistribute with Zoltan: epetraext_ex2

AztecOO Examples

Simple Jacobi preconditioner: aztecoo_ex1
AztecOO as a preconditioner for AztecOO: aztecoo_ex2
AztecOO CG and ICC(0) factorization as preconditioner: aztecoo_ex3

IFPACK Examples

Using IFPACK factorizations as Aztec's preconditioners: ifpack_ex1, ifpack_ex2

ML Examples

Two-level domain decomposition preconditioner with AztecOO and ML: ml_ex1
Use of ML as a black-box smoothed aggregation preconditioner: ml_ex2

NOX Examples

Simple nonlinear problem: nox_ex1
Simple nonlinear PDE problem: nox_ex2

Teuchos Examples

Teuchos dense matrices: teuchos_ex1
Teuchos interface to BLAS: teuchos_ex2
Teuchos interface to LAPACK: teuchos_ex3
Teuchos parameters list: teuchos_ex4
Teuchos RCP: teuchos_ex5
Teuchos time monitor: teuchos_ex6
Teuchos command line processor: teuchos_ex7

Triutils Examples

Read a matrix in HB format: triutils_ex1
Basic usage of CommandLineParser: triutils_ex2

Table of Contents