Tpetra Matrix/Vector Services Version of the Day
Tpetra_Power_Method_From_File.cpp
00001 #include <Teuchos_GlobalMPISession.hpp>
00002 #include <Teuchos_oblackholestream.hpp>
00003 #include <Teuchos_CommandLineProcessor.hpp>
00004 #include <Teuchos_Array.hpp>
00005 
00006 // I/O for Harwell-Boeing files
00007 #include <Tpetra_MatrixIO.hpp>
00008 
00009 #include "Tpetra_Power_Method.hpp"
00010 
00011 #include "Tpetra_DefaultPlatform.hpp"
00012 #include "Tpetra_Version.hpp"
00013 #include "Tpetra_Map.hpp"
00014 #include "Tpetra_MultiVector.hpp"
00015 #include "Tpetra_Vector.hpp"
00016 #include "Tpetra_CrsMatrix.hpp"
00017 
00018 int main(int argc, char *argv[]) {
00019   Teuchos::oblackholestream blackhole;
00020   Teuchos::GlobalMPISession mpiSession(&argc,&argv,&blackhole);
00021 
00022   //
00023   // Specify types used in this example
00024   // 
00025   typedef double Scalar;
00026   typedef Teuchos::ScalarTraits<Scalar>::magnitudeType Magnitude;
00027   typedef int Ordinal;
00028   typedef Tpetra::DefaultPlatform::DefaultPlatformType           Platform;
00029   typedef Tpetra::DefaultPlatform::DefaultPlatformType::NodeType Node;
00030 
00031   // 
00032   // Get the default communicator and node
00033   //
00034   Platform &platform = Tpetra::DefaultPlatform::getDefaultPlatform();
00035   Teuchos::RCP<const Teuchos::Comm<int> > comm = platform.getComm();
00036   Teuchos::RCP<Node>             node = platform.getNode();
00037   const int myRank = comm->getRank();
00038 
00039   //
00040   // Get example parameters from command-line processor
00041   //  
00042   bool printMatrix = false;
00043   bool verbose = (myRank==0);
00044   int niters = 100;
00045   Magnitude tolerance = 1.0e-2;
00046   std::string filename("bcsstk14.hb");
00047   Teuchos::CommandLineProcessor cmdp(false,true);
00048   cmdp.setOption("verbose","quiet",&verbose,"Print messages and results.");
00049   cmdp.setOption("filename",&filename,"Filename for Harwell-Boeing test matrix.");
00050   cmdp.setOption("tolerance",&tolerance,"Relative residual tolerance used for solver.");
00051   cmdp.setOption("iterations",&niters,"Maximum number of iterations.");
00052   cmdp.setOption("printMatrix","noPrintMatrix",&printMatrix,"Print the full matrix after reading it.");
00053   if (cmdp.parse(argc,argv) != Teuchos::CommandLineProcessor::PARSE_SUCCESSFUL) {
00054     return -1;
00055   }
00056 
00057   // 
00058   // Say hello, print some communicator info
00059   //
00060   if (verbose) {
00061     std::cout << "\n" << Tpetra::version() << std::endl << std::endl;
00062   }
00063   std::cout << "Comm info: " << *comm;
00064 
00065   //
00066   // Read Tpetra::CrsMatrix from file
00067   //
00068   Teuchos::RCP< Tpetra::CrsMatrix<Scalar,Ordinal> > A;
00069   Tpetra::Utils::readHBMatrix(filename,comm,node,A);
00070   if (printMatrix) {
00071     Teuchos::RCP<Teuchos::FancyOStream> fos = Teuchos::fancyOStream(Teuchos::rcpFromRef(std::cout));
00072     A->describe(*fos, Teuchos::VERB_EXTREME);
00073   }
00074   else if (verbose) {
00075     std::cout << std::endl << A->description() << std::endl << std::endl;
00076   }
00077 
00078   //
00079   // Iterate
00080   //
00081   Scalar lambda;
00082   lambda = TpetraExamples::powerMethod<Scalar,Ordinal>(A, niters, tolerance, verbose);
00083 
00084   if (verbose) {
00085     std::cout << "\nEnd Result: TEST PASSED" << std::endl;
00086   }
00087   return 0;
00088 }
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