Teuchos Package Browser (Single Doxygen Collection) Version of the Day
numerics/example/LAPACK/cxx_main.cpp
Go to the documentation of this file.
00001 /*
00002 // @HEADER
00003 // ***********************************************************************
00004 //
00005 //                    Teuchos: Common Tools Package
00006 //                 Copyright (2004) Sandia Corporation
00007 //
00008 // Under terms of Contract DE-AC04-94AL85000, there is a non-exclusive
00009 // license for use of this work by or on behalf of the U.S. Government.
00010 //
00011 // Redistribution and use in source and binary forms, with or without
00012 // modification, are permitted provided that the following conditions are
00013 // met:
00014 //
00015 // 1. Redistributions of source code must retain the above copyright
00016 // notice, this list of conditions and the following disclaimer.
00017 //
00018 // 2. Redistributions in binary form must reproduce the above copyright
00019 // notice, this list of conditions and the following disclaimer in the
00020 // documentation and/or other materials provided with the distribution.
00021 //
00022 // 3. Neither the name of the Corporation nor the names of the
00023 // contributors may be used to endorse or promote products derived from
00024 // this software without specific prior written permission.
00025 //
00026 // THIS SOFTWARE IS PROVIDED BY SANDIA CORPORATION "AS IS" AND ANY
00027 // EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
00028 // IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
00029 // PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL SANDIA CORPORATION OR THE
00030 // CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
00031 // EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
00032 // PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
00033 // PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
00034 // LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
00035 // NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
00036 // SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00037 //
00038 // Questions? Contact Michael A. Heroux (maherou@sandia.gov)
00039 //
00040 // ***********************************************************************
00041 // @HEADER
00042 */
00043 
00044 #include "Teuchos_LAPACK.hpp"
00045 #include "Teuchos_SerialDenseMatrix.hpp"
00046 #include "Teuchos_SerialDenseVector.hpp"
00047 #include "Teuchos_Version.hpp"
00048 
00049 int main(int argc, char* argv[])
00050 {
00051   std::cout << Teuchos::Teuchos_Version() << std::endl << std::endl;
00052 
00053   // Creating an instance of the LAPACK class for double-precision routines looks like:
00054   Teuchos::LAPACK<int, double> lapack;
00055 
00056   // This instance provides the access to all the LAPACK routines.
00057   Teuchos::SerialDenseMatrix<int, double> My_Matrix(4,4);
00058   Teuchos::SerialDenseVector<int, double> My_Vector(4);
00059   My_Matrix.random();
00060   My_Vector.random();
00061 
00062   // Perform an LU factorization of this matrix. 
00063   int ipiv[4], info;
00064   char TRANS = 'N';
00065   lapack.GETRF( 4, 4, My_Matrix.values(), My_Matrix.stride(), ipiv, &info ); 
00066   
00067   // Solve the linear system.
00068   lapack.GETRS( TRANS, 4, 1, My_Matrix.values(), My_Matrix.stride(), 
00069     ipiv, My_Vector.values(), My_Vector.stride(), &info );  
00070 
00071   // Print out the solution.
00072   std::cout << My_Vector << std::endl;
00073 
00074   return 0;
00075 }
 All Classes Namespaces Files Functions Variables Typedefs Enumerations Enumerator Friends Defines