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//
// Didasko Tutorial Package
// Copyright (2005) Sandia Corporation
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// @HEADER
// Show the usage of RowMap, ColumnMap, RangeMap and DomainMap
// This code must be run with two processes
#include "Didasko_ConfigDefs.h"
#if defined(HAVE_DIDASKO_EPETRA)
#include "Epetra_ConfigDefs.h"
#ifdef HAVE_MPI
#include "mpi.h"
#include "Epetra_MpiComm.h"
#else
#include "Epetra_SerialComm.h"
#endif
#include "Epetra_Vector.h"
#include "Epetra_Map.h"
#include "Epetra_CrsMatrix.h"
int main(int argc, char *argv[])
{
#ifdef HAVE_MPI
MPI_Init(&argc, &argv);
Epetra_MpiComm Comm(MPI_COMM_WORLD);
#else
#endif
int MyPID = Comm.MyPID();
int NumProc = Comm.NumProc();
if( NumProc != 2 ) {
#ifdef HAVE_MPI
MPI_Finalize();
#endif
return(EXIT_SUCCESS);
}
// I define two maps:
// - MapA has 2 nodes on proc 0, 2 nodes on proc 1
// - MapB has 4 nodes on proc 0, 0 nodes on proc 1
int NumElementsA = 0, NumElementsB = 0;
switch( MyPID ) {
case 0:
NumElementsA = 2;
NumElementsB = 4;
break;
case 1:
NumElementsA = 2;
NumElementsB = 0;
break;
}
Epetra_Map MapA(-1,NumElementsA,0,Comm);
Epetra_Map MapB(-1,NumElementsB,0,Comm);
// I create a diagonal matrix Q with RowMap,ColMap distibutions = MapA
Epetra_CrsMatrix Q(Copy,MapA,MapA,1);
int * MyGlobalElementsA = MapA.MyGlobalElements();
// Now I put in Q the diagonal elements, using MapA
for( int i=0 ; i<NumElementsA ; ++i ) {
double one = 2.0;
int indices = MyGlobalElementsA[i];
Q.InsertGlobalValues(MyGlobalElementsA[i], 1, &one, &indices );
}
// Now, I would like to apply Q to a vector defined on
// MapB, giving as a result a vector on MapB
Q.FillComplete(MapB,MapB);
// the instruction above causes the code to crash if
// I build up the matrix as `Epetra_CrsMatrix Q(Copy,MapA,1)'
// (without specifing the col map)
// create few vectors on the two maps
Epetra_Vector VecA(MapA); Epetra_Vector VecA2(MapA);
Epetra_Vector VecB(MapB); Epetra_Vector VecB2(MapB);
VecA.PutScalar(1.0); VecA2.PutScalar(1.0);
VecB.PutScalar(1.0); VecB2.PutScalar(1.0);
Q.Multiply(false,VecB,VecB2);
cout << VecB2;
#ifdef HAVE_MPI
MPI_Finalize();
#endif
return(EXIT_SUCCESS);
}
#else
#include <stdlib.h>
#include <stdio.h>
int main(int argc, char *argv[])
{
puts("Please configure Didasko with:\n"
"--enable-epetra");
return 0;
}
#endif