RTOpPack_TOpRandomize.hpp

Go to the documentation of this file.

// @HEADER
// ***********************************************************************
// 
// RTOp: Interfaces and Support Software for Vector Reduction Transformation
//       Operations
//                Copyright (2006) Sandia Corporation
// 
// Under terms of Contract DE-AC04-94AL85000, there is a non-exclusive
// license for use of this work by or on behalf of the U.S. Government.
// 
// This library is free software; you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as
// published by the Free Software Foundation; either version 2.1 of the
// License, or (at your option) any later version.
//  
// This library is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Lesser General Public License for more details.
//  
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
// USA
// Questions? Contact Roscoe A. Bartlett (rabartl@sandia.gov) 
// 
// ***********************************************************************
// @HEADER

#ifndef RTOPPACK_TOP_RANDOMIZE_HPP
#define RTOPPACK_TOP_RANDOMIZE_HPP

#include "RTOpPack_RTOpTHelpers.hpp"


namespace RTOpPack {


template<class Scalar>
class TOpRandomize : public RTOpT<Scalar> {
public:
  using RTOpT<Scalar>::apply_op;
  static void set_static_seed( const unsigned int static_seed )
    { static_seed_ = static_seed; }
  static unsigned int get_static_seed() { return static_seed_; }
  TOpRandomize(
    const Scalar& l = -ScalarTraits<Scalar>::one(),
    const Scalar& u = +ScalarTraits<Scalar>::one()
    )
    {
      this->setOpNameBase("TOpRandomize");
      set_bounds(l, u);
      set_seed(static_seed_);
      ++static_seed_; // By default we will just increment the seed!
    }
  void set_bounds( const Scalar& l, const Scalar& u )
    { l_ = l; u_ = u; }
  void set_seed( const unsigned int seed ) { seed_ = seed; }
  unsigned int get_seed() const { return seed_; }
  void apply_op_impl(
    const ArrayView<const ConstSubVectorView<Scalar> > &sub_vecs,
    const ArrayView<const SubVectorView<Scalar> > &targ_sub_vecs,
    const Ptr<ReductTarget> &reduct_obj_inout
    ) const
    {
      typedef typename Teuchos::ArrayRCP<const Scalar>::iterator const_iter_t;
      typedef typename Teuchos::ArrayRCP<Scalar>::iterator iter_t;

#ifdef TEUCHOS_DEBUG
      validate_apply_op<Scalar>(*this, 0, 1, false,
        sub_vecs, targ_sub_vecs, reduct_obj_inout.getConst());
#endif
      
      const index_type subDim = targ_sub_vecs[0].subDim();
      const index_type globalOffset =  targ_sub_vecs[0].globalOffset();

      iter_t z0_val = targ_sub_vecs[0].values().begin();
      const ptrdiff_t z0_s = targ_sub_vecs[0].stride();

      // Linear coefficients for translating from [-1,+1] to [l,b]
      const Scalar a = Scalar(0.5)*(u_ - l_);
      const Scalar b = Scalar(0.5)*(u_ + l_);
      for( index_type i = 0; i < subDim; ++i, z0_val += z0_s )
      {
        Teuchos::ScalarTraits<Scalar>::seedrandom(seed_+globalOffset+i);
        *z0_val = a * Teuchos::ScalarTraits<Scalar>::random() + b;
        // Above should be in the range [l,b]
      }
    }
private:
  static unsigned int static_seed_;
  unsigned int seed_;
  Scalar l_;
  Scalar u_;
};


template<class Scalar>
unsigned int TOpRandomize<Scalar>::static_seed_ = 0;


} // namespace RTOpPack


#endif // RTOPPACK_TOP_RANDOMIZE_HPP