RTOpPack_TOpRandomize.hpp

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00003 // 
00004 // RTOp: Interfaces and Support Software for Vector Reduction Transformation
00005 //       Operations
00006 //                Copyright (2006) Sandia Corporation
00007 // 
00008 // Under terms of Contract DE-AC04-94AL85000, there is a non-exclusive
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00011 // This library is free software; you can redistribute it and/or modify
00012 // it under the terms of the GNU Lesser General Public License as
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00029 
00030 #ifndef RTOPPACK_TOP_RANDOMIZE_HPP
00031 #define RTOPPACK_TOP_RANDOMIZE_HPP
00032 
00033 #include "RTOpPack_RTOpTHelpers.hpp"
00034 
00035 namespace RTOpPack {
00036 
00048 template<class Scalar>
00049 class TOpRandomize : public ROpScalarScalarTransformationBase<Scalar> {
00050 public:
00052   static void set_static_seed( const unsigned int static_seed ) { static_seed_ = static_seed; }
00054   static unsigned int get_static_seed() { return static_seed_; }
00056   TOpRandomize(
00057     const Scalar& l   = -Teuchos::ScalarTraits<Scalar>::one()
00058     ,const Scalar& u  = +Teuchos::ScalarTraits<Scalar>::one()
00059     )
00060     :RTOpT<Scalar>("TOpRandomize"), ROpScalarScalarTransformationBase<Scalar>(l,u)
00061     {
00062       seed_ = static_seed_;
00063       ++static_seed_; // By default we will just increment the seed!
00064     }
00066   void set_bounds( const Scalar& l, const Scalar& u ) { this->scalarData1(l); this->scalarData2(u); }
00068   void set_seed( const unsigned int seed ) { seed_ = seed; }
00070   unsigned int get_seed() const { return seed_; }
00074   void apply_op(
00075     const int   num_vecs,       const ConstSubVectorView<Scalar>         sub_vecs[]
00076     ,const int  num_targ_vecs,  const SubVectorView<Scalar>              targ_sub_vecs[]
00077     ,ReductTarget *reduct_obj
00078     ) const
00079     {
00080       const Scalar l = this->scalarData1(), u = this->scalarData2();
00081       const Scalar a = Scalar(0.5)*(u-l), b = Scalar(0.5)*(u+l) ; // Linear coefficients for translating from [-1,+1] to [l,b]
00082       RTOP_APPLY_OP_0_1(num_vecs,sub_vecs,num_targ_vecs,targ_sub_vecs);
00083       for( Teuchos_Index i = 0; i < subDim; ++i, z0_val += z0_s ) {
00084         Teuchos::ScalarTraits<Scalar>::seedrandom(seed_+globalOffset+i);
00085         *z0_val = a * Teuchos::ScalarTraits<Scalar>::random() + b; // Should be in the range [l,b]
00086       }
00087     }
00089 private:
00090   static unsigned int     static_seed_;
00091   unsigned int            seed_;
00092 }; // class TOpRandomize
00093 
00094 template<class Scalar>
00095 unsigned int TOpRandomize<Scalar>::static_seed_ = 0;
00096 
00097 } // namespace RTOpPack
00098 
00099 #endif // RTOPPACK_TOP_RANDOMIZE_HPP

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