RTOpPack_TOpRandomize.hpp

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//      Thyra: Interfaces and Support Code for the Interoperability of Abstract Numerical Algorithms 
//                 Copyright (2004) 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:
  void set_bounds( const Scalar& l, const Scalar& u ) { this->scalarData1(l); this->scalarData2(u); }
  TOpRandomize(
    const Scalar& l   = -Teuchos::ScalarTraits<Scalar>::one()
    ,const Scalar& u  = +Teuchos::ScalarTraits<Scalar>::one()
    )
    : RTOpT<Scalar>("TOpRandomize"), ROpScalarScalarTransformationBase<Scalar>(l,u)
    {}
  void apply_op(
    const int   num_vecs,       const SubVectorT<Scalar>         sub_vecs[]
    ,const int  num_targ_vecs,  const MutableSubVectorT<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( RTOp_index_type i = 0; i < subDim; ++i, z0_val += z0_s ) {
        *z0_val = a * Teuchos::ScalarTraits<Scalar>::random() + b; // Should be in the range [l,b]
      }
    }
}; // class TOpRandomize

} // namespace RTOpPack

#endif // RTOPPACK_TOP_RANDOMIZE_HPP

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