RTOpPack_TOpRandomize.hpp

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// RTOp: Interfaces and Support Software for Vector Reduction Transformation
//       Operations
//                Copyright (2006) Sandia Corporation
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#ifndef RTOPPACK_TOP_RANDOMIZE_HPP
#define RTOPPACK_TOP_RANDOMIZE_HPP

#include "RTOpPack_RTOpTHelpers.hpp"

namespace RTOpPack {

template<class Scalar>
class TOpRandomize : public ROpScalarScalarTransformationBase<Scalar> {
public:
  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   = -Teuchos::ScalarTraits<Scalar>::one()
    ,const Scalar& u  = +Teuchos::ScalarTraits<Scalar>::one()
    )
    :RTOpT<Scalar>("TOpRandomize"), ROpScalarScalarTransformationBase<Scalar>(l,u)
    {
      seed_ = static_seed_;
      ++static_seed_; // By default we will just increment the seed!
    }
  void set_bounds( const Scalar& l, const Scalar& u ) { this->scalarData1(l); this->scalarData2(u); }
  void set_seed( const unsigned int seed ) { seed_ = seed; }
  unsigned int get_seed() const { return seed_; }
  void apply_op(
    const int   num_vecs,       const ConstSubVectorView<Scalar>         sub_vecs[]
    ,const int  num_targ_vecs,  const SubVectorView<Scalar>              targ_sub_vecs[]
    ,ReductTarget *reduct_obj
    ) const
    {
      const Scalar l = this->scalarData1(), u = this->scalarData2();
      const Scalar a = Scalar(0.5)*(u-l), b = Scalar(0.5)*(u+l) ; // Linear coefficients for translating from [-1,+1] to [l,b]
      RTOP_APPLY_OP_0_1(num_vecs,sub_vecs,num_targ_vecs,targ_sub_vecs);
      for( Teuchos_Index i = 0; i < subDim; ++i, z0_val += z0_s ) {
        Teuchos::ScalarTraits<Scalar>::seedrandom(seed_+globalOffset+i);
        *z0_val = a * Teuchos::ScalarTraits<Scalar>::random() + b; // Should be in the range [l,b]
      }
    }
private:
  static unsigned int     static_seed_;
  unsigned int            seed_;
}; // class TOpRandomize

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

} // namespace RTOpPack

#endif // RTOPPACK_TOP_RANDOMIZE_HPP

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