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example/BLAS/cxx_main.cpp
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00001 /*
00003 // ***********************************************************************
00004 //
00005 //                    Teuchos: Common Tools Package
00006 //                 Copyright (2004) Sandia Corporation
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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
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00042 */
00043
00044 #include "Teuchos_BLAS.hpp"
00045 #include "Teuchos_Version.hpp"
00046
00047 int main(int argc, char* argv[])
00048 {
00049   std::cout << Teuchos::Teuchos_Version() << std::endl << std::endl;
00050
00051   // Creating an instance of the BLAS class for double-precision kernels looks like:
00052   Teuchos::BLAS<int, double> blas;
00053
00054   // This instance provides the access to all the BLAS kernels listed in Figure \ref{blas_kernels}:
00055   const int n = 10;
00056   double alpha = 2.0;
00057   double x[ n ];
00058   for ( int i=0; i<n; i++ ) { x[i] = i; }
00059   blas.SCAL( n, alpha, x, 1 );
00060   int max_idx = blas.IAMAX( n, x, 1 );
00061   std::cout<< "The index of the maximum magnitude entry of x[] is the "
00062       <<  max_idx <<"-th and x[ " << max_idx-1 << " ] = "<< x[max_idx-1]
00063       << std::endl;
00064
00065   return 0;
00066 }