stir_NumericalRecipes.h

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//
//

/*
    Copyright (C) 2003- 2009, Hammersmith Imanet Ltd
    This file is part of STIR.
 
    SPDX-License-Identifier: Apache-2.0
 
    See STIR/LICENSE.txt for details
*/
#ifndef __stir_numerics_stir_NumericalRecipes_h__
#define __stir_numerics_stir_NumericalRecipes_h__
 
#include "stir/VectorWithOffset.h"
#include "stir/Array.h"
#include <complex>
 
START_NAMESPACE_STIR

 
inline void
stir_to_nr(const VectorWithOffset<std::complex<float>>& c, VectorWithOffset<float>& nr_data)
{
  for (int i = 0; i < c.get_length(); ++i)
    {
      nr_data[2 * i + 1] = c[i].real();
      nr_data[2 * i + 2] = c[i].imag();
    }
}
 
inline void
stir_to_nr(const Array<2, std::complex<float>>& c2d, VectorWithOffset<float>& nr_data)
{
 
  VectorWithOffset<float>::iterator nr_iter = nr_data.begin();
 
  Array<2, std::complex<float>>::const_full_iterator iter = c2d.begin_all();
 
  while (iter != c2d.end_all())
    {
      *nr_iter++ = iter->real();
      *nr_iter++ = iter->imag();
      ++iter;
    }
}
 
inline void
stir_to_nr(const VectorWithOffset<Array<1, std::complex<float>>>& c2d, VectorWithOffset<float>& nr_data)
{
 
  VectorWithOffset<float>::iterator nr_iter = nr_data.begin();
 
  VectorWithOffset<Array<1, std::complex<float>>>::const_iterator iter = c2d.begin();
  while (iter != c2d.end())
    {
      Array<1, std::complex<float>>::const_iterator row_iter = iter->begin();
      while (row_iter != iter->end())
        {
          *nr_iter++ = row_iter->real();
          *nr_iter++ = row_iter->imag();
          ++row_iter;
        }
      ++iter;
    }
}
 
void
nr_to_stir(const VectorWithOffset<float>& nr_data, VectorWithOffset<std::complex<float>>& c)
{
  for (int i = 0; i < c.get_length(); ++i)
    {
      c[i] = std::complex<float>(nr_data[2 * i + 1], nr_data[2 * i + 2]);
    }
}
 
inline void
nr_to_stir(const VectorWithOffset<float>& nr_data, Array<2, std::complex<float>>& c2d)
{
  VectorWithOffset<float>::const_iterator nr_iter = nr_data.begin();
  Array<2, std::complex<float>>::full_iterator iter = c2d.begin_all();
  while (iter != c2d.end_all())
    {
      *iter = std::complex<float>(*nr_iter, *(nr_iter + 1));
      nr_iter += 2;
      ++iter;
    }
}
 
inline void
nr_to_stir(const VectorWithOffset<float>& nr_data, VectorWithOffset<Array<1, std::complex<float>>>& c2d)
{
  VectorWithOffset<float>::const_iterator nr_iter = nr_data.begin();
  VectorWithOffset<Array<1, std::complex<float>>>::iterator iter = c2d.begin();
  while (iter != c2d.end())
    {
      Array<1, std::complex<float>>::iterator row_iter = iter->begin();
      while (row_iter != iter->end())
        {
          *row_iter = std::complex<float>(*nr_iter, *(nr_iter + 1));
          nr_iter += 2;
          ++row_iter;
        }
      ++iter;
    }
}
 
#if 0
void real_to_complex(const VectorWithOffset< std::complex<float> >& c,
                VectorWithOffset<float>& nr_data)
{
      Array<2,std::complex<float> >::const_full_iterator iter=
        c2d.begin_all();
 
      while(iter != c2d.end_all())
      {
        *nr_iter++ = iter->real();
        *nr_iter++ = iter->imag();
        ++iter;
      }
  for (int i=0; i<c.get_length(); ++i)
  {
    nr_data[2*i+1] = c[i].real();
    nr_data[2*i+2] = c[i].imag();
  }
}
#endif

 
END_NAMESPACE_STIR
#endif