include/realroot/bernstein_eenv_vrestrict.hpp

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/********************************************************************
 *   This file is part of the source code of the realroot library.
 *   Author(s): J.P. Pavone, GALAAD, INRIA
 *   $Id: eenv-vrestrict.hpp,v 1.1 2005/07/11 10:03:55 jppavone Exp $
 ********************************************************************/
template< class real_t >
static void v0restrict( real_t * rs, bernstein::eenv * em, const real_t& l )
{
  int k,i,j;
  real_t * ri, * rip;
  //  std::copy(ms,ms+em->data_size(),rs);
  for ( k = em->m_szs[0]-1; k >= 0; k-- )
    {
      for ( i = 0; i < k; i ++ )
        {
          ri  = rs + i*em->m_str[0];
          rip = ri + em->m_str[0];
          for ( j = 0; j < em->m_str[0]; j ++ )
            ri[j] = (1.0-l)*ri[j]+l*rip[j];
        };
    };
};

template< class real_t >
static void v0restrict( real_t * rs, real_t * ms, bernstein::eenv * em, const real_t& l )
{
  int k,i,j;
  real_t * ri, * rip;
  std::copy(ms,ms+em->data_size(),rs);
  v0restrict( rs, em, l );
};

template<class X, class real_t >
static void vrestrict( bernstein::eenv * oenv, bernstein::eenv * ienv, 
                X *& dst, real_t * src,  sz_t v, const X& prm )
{
  sz_t nvr = ienv->m_nvr-1;
  sz_t c = 0;
  sz_t vrs[ienv->m_nvr];
  sz_t szs[ienv->m_nvr];
  std::copy(ienv->m_vrs,ienv->m_vrs + ienv->m_nvr, vrs );
  std::copy(ienv->m_szs,ienv->m_szs + ienv->m_nvr, szs );
  std::swap(vrs[v],vrs[0]);
  std::swap(szs[v],szs[0]);
  bernstein::eenv veenv( ienv->m_nvr, szs, vrs );
  unsigned * addr = new unsigned[ ienv->data_size() ];
  oaddress( &veenv, addr, ienv, 0, 0 );
  X * tmp = new X[ienv->data_size()];
  for ( unsigned c = 0;  c < ienv->data_size(); tmp[addr[c]] = src[c], c ++ );
  delete[] addr;
  v0restrict(tmp,&veenv,prm);
  oenv->~eenv();
  new(oenv) bernstein::eenv( ienv->m_nvr-1, szs+1, vrs+1 );
  dst = new X[oenv->data_size()];
  std::copy( tmp, tmp + oenv->data_size(), dst );
};

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