source: trunk/lib/gslapi/vector.cc @ 328

// $Id: vector.cc 328 2005-05-30 23:04:20Z jari $

#include <c++_tools/gslapi/vector.h>
#include <c++_tools/utility/stl_utility.h>

#include <iostream>
#include <vector>
#include <utility>


namespace theplu {
namespace gslapi {



  vector::vector(void)
    : v_(NULL), view_(NULL)
  {
  }



  vector::vector(const size_t n,const double init_value)
    : view_(NULL)
  {
    v_ = gsl_vector_alloc(n);
    set_all(init_value);
  }



  vector::vector(const vector& other)
    : view_(NULL)
  {
    v_ = other.TEMP_gsl_vector_copy();
  }



  vector::vector(vector& v, size_t offset, size_t n, size_t stride)
  {
    view_ = new gsl_vector_view(gsl_vector_subvector_with_stride(v.v_,offset,
                                                                 stride,n));
    v_ = &(view_->vector);
  }



  vector::vector(gsl_vector* vec)
    : v_(vec), view_(NULL)
  {
  }



  vector::vector(std::istream& is)
    : view_(NULL)
  {
    // read the data file and store in stl vectors (dynamically
    // expandable)
    std::vector<std::vector<double> > data_matrix;
    u_int nof_columns=0;
    u_int nof_rows=0;
    std::vector<double> v;
    for (nof_rows = 0; utility::read_to_double(is, v); nof_rows++) {
      // Ignoring empty lines
      if (!v.size()) {
        nof_rows--;
        continue;
      }
      if (!nof_columns)
        nof_columns=v.size();
      else if ((nof_rows>1) && (nof_columns>1)) {
        std::cerr << "vector::vector(std::istream&) data file error:\n"
                  << "file has " << nof_rows << " rows and " << nof_columns
                  << " columns; expected a row vector or a column vector."
                  << std::endl;
        exit(1);
      }
      else if(v.size()!=nof_columns) {
        std::cerr << "vector::vector(std::istream&) data file error: "
                  << "line" << nof_rows+1 << " has " << v.size() 
                  << " columns; expected " << nof_columns << " columns"
                  << std::endl;
        exit(1);
      }
      data_matrix.push_back(v);
    }

    // manipulate the state of the stream to be good
    is.clear(std::ios::goodbit);
    // convert the data to a gsl vector
    v_ = gsl_vector_alloc(nof_rows*nof_columns);
    size_t n=0;
    for (size_t i=0; i<nof_rows; i++)
      for (size_t j=0; j<nof_columns; j++) 
        gsl_vector_set( v_, n++, data_matrix[i][j] );
  }



  vector::~vector(void)
  {
    if (view_)
      delete view_;
    else if (v_)
      gsl_vector_free(v_);
    v_=NULL;
  }



  gsl_vector* vector::TEMP_gsl_vector_copy(void) const
  {
    gsl_vector* vec = gsl_vector_alloc(size());
    gsl_vector_memcpy(vec,v_);
    return vec;
  }



  std::pair<double,double> vector::minmax(void) const
  {
    double min, max;
    gsl_vector_minmax(v_,&min,&max);
    return std::pair<double,double>(min,max);
  }



  std::pair<size_t,size_t> vector::minmax_index(void) const
  {
    size_t min_index, max_index;
    gsl_vector_minmax_index(v_,&min_index,&max_index);
    return std::pair<size_t,size_t>(min_index,max_index);
  }



  double vector::sum(void) const
  {
    double sum = 0;
    for (size_t i=0; i<size(); i++)
      sum += gsl_vector_get( v_, i );
    return( sum );
  }  



  vector vector::operator-(void) const
  {
    vector res( *this );
    gsl_vector_scale (res.v_,-1.);
    return res;
  }



  double vector::operator*( const vector &other ) const
  {
    // Jari, check for gsl_support
    double res = 0.0;;
    for ( size_t i = 0; i < size(); ++i ) 
      res += other[i] * (*this)[i];
    return res;
  }



  vector vector::operator+(const vector &other) const
  {
    vector res(*this);
    gsl_vector_add(res.v_,other.v_);
    return res;
  }



  vector vector::operator-( const vector &other ) const
  {
    vector res( *this );
    gsl_vector_sub(res.v_,other.v_);
    return res;
  }



  vector& vector::operator=( const vector& other )
  {
    if( this != &other ) {
      if ( v_ )
        gsl_vector_free( v_ );
      v_ = other.TEMP_gsl_vector_copy();
    }
    return *this;
  } 



  std::ostream& operator<<(std::ostream& s, const vector& a)
  {
    s.setf(std::ios::fixed);

    for (size_t j = 0; j < a.size(); ++j) {
      s << a[j];
      if ( (j+1)<a.size() )
        s << " ";
    }

    return s;
  }


}} // of namespace gslapi and namespace thep