// ColumnVector manipulations.
/*

Copyright (C) 1994, 1995, 1996, 1997, 2000, 2001, 2002, 2003, 2004,
              2005, 2007, 2008 John W. Eaton
Copyright (C) 2010 VZLU Prague

This file is part of Octave.

Octave is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 3 of the License, or (at your
option) any later version.

Octave is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
for more details.

You should have received a copy of the GNU General Public License
along with Octave; see the file COPYING.  If not, see
<http://www.gnu.org/licenses/>.

*/

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <iostream>

#include "Array-util.h"
#include "f77-fcn.h"
#include "functor.h"
#include "lo-error.h"
#include "mx-base.h"
#include "mx-inlines.cc"
#include "oct-cmplx.h"

// Fortran functions we call.

extern "C"
{
  F77_RET_T
  F77_FUNC (zgemv, ZGEMV) (F77_CONST_CHAR_ARG_DECL,
                           const octave_idx_type&, const octave_idx_type&, const Complex&,
                           const Complex*, const octave_idx_type&, const Complex*,
                           const octave_idx_type&, const Complex&, Complex*, const octave_idx_type&
                           F77_CHAR_ARG_LEN_DECL);
}

// Complex Column Vector class

ComplexColumnVector::ComplexColumnVector (const ColumnVector& a)
   : MArray<Complex> (a)
{
}

bool
ComplexColumnVector::operator == (const ComplexColumnVector& a) const
{
  octave_idx_type len = length ();
  if (len != a.length ())
    return 0;
  return mx_inline_equal (len, data (), a.data ());
}

bool
ComplexColumnVector::operator != (const ComplexColumnVector& a) const
{
  return !(*this == a);
}

// destructive insert/delete/reorder operations

ComplexColumnVector&
ComplexColumnVector::insert (const ColumnVector& a, octave_idx_type r)
{
  octave_idx_type a_len = a.length ();

  if (r < 0 || r + a_len > length ())
    {
      (*current_liboctave_error_handler) ("range error for insert");
      return *this;
    }

  if (a_len > 0)
    {
      make_unique ();

      for (octave_idx_type i = 0; i < a_len; i++)
        xelem (r+i) = a.elem (i);
    }

  return *this;
}

ComplexColumnVector&
ComplexColumnVector::insert (const ComplexColumnVector& a, octave_idx_type r)
{
  octave_idx_type a_len = a.length ();

  if (r < 0 || r + a_len > length ())
    {
      (*current_liboctave_error_handler) ("range error for insert");
      return *this;
    }

  if (a_len > 0)
    {
      make_unique ();

      for (octave_idx_type i = 0; i < a_len; i++)
        xelem (r+i) = a.elem (i);
    }

  return *this;
}

ComplexColumnVector&
ComplexColumnVector::fill (double val)
{
  octave_idx_type len = length ();

  if (len > 0)
    {
      make_unique ();

      for (octave_idx_type i = 0; i < len; i++)
        xelem (i) = val;
    }

  return *this;
}

ComplexColumnVector&
ComplexColumnVector::fill (const Complex& val)
{
  octave_idx_type len = length ();

  if (len > 0)
    {
      make_unique ();

      for (octave_idx_type i = 0; i < len; i++)
        xelem (i) = val;
    }


  return *this;
}

ComplexColumnVector&
ComplexColumnVector::fill (double val, octave_idx_type r1, octave_idx_type r2)
{
  octave_idx_type len = length ();

  if (r1 < 0 || r2 < 0 || r1 >= len || r2 >= len)
    {
      (*current_liboctave_error_handler) ("range error for fill");
      return *this;
    }

  if (r1 > r2) { octave_idx_type tmp = r1; r1 = r2; r2 = tmp; }

  if (r2 >= r1)
    {
      make_unique ();

      for (octave_idx_type i = r1; i <= r2; i++)
        xelem (i) = val;
    }

  return *this;
}

ComplexColumnVector&
ComplexColumnVector::fill (const Complex& val, octave_idx_type r1, octave_idx_type r2)
{
  octave_idx_type len = length ();

  if (r1 < 0 || r2 < 0 || r1 >= len || r2 >= len)
    {
      (*current_liboctave_error_handler) ("range error for fill");
      return *this;
    }

  if (r1 > r2) { octave_idx_type tmp = r1; r1 = r2; r2 = tmp; }

  if (r2 >= r1)
    {
      make_unique ();

      for (octave_idx_type i = r1; i <= r2; i++)
        xelem (i) = val;
    }

  return *this;
}

ComplexColumnVector
ComplexColumnVector::stack (const ColumnVector& a) const
{
  octave_idx_type len = length ();
  octave_idx_type nr_insert = len;
  ComplexColumnVector retval (len + a.length ());
  retval.insert (*this, 0);
  retval.insert (a, nr_insert);
  return retval;
}

ComplexColumnVector
ComplexColumnVector::stack (const ComplexColumnVector& a) const
{
  octave_idx_type len = length ();
  octave_idx_type nr_insert = len;
  ComplexColumnVector retval (len + a.length ());
  retval.insert (*this, 0);
  retval.insert (a, nr_insert);
  return retval;
}

ComplexRowVector 
ComplexColumnVector::hermitian (void) const
{ 
  return MArray<Complex>::hermitian (std::conj);
}

ComplexRowVector
ComplexColumnVector::transpose (void) const
{
  return MArray<Complex>::transpose ();
}

ColumnVector
ComplexColumnVector::abs (void) const
{
  return do_mx_unary_map<double, Complex, std::abs> (*this);
}

ComplexColumnVector
conj (const ComplexColumnVector& a)
{
  return do_mx_unary_map<Complex, Complex, std::conj> (a);
}

// resize is the destructive equivalent for this one

ComplexColumnVector
ComplexColumnVector::extract (octave_idx_type r1, octave_idx_type r2) const
{
  if (r1 > r2) { octave_idx_type tmp = r1; r1 = r2; r2 = tmp; }

  octave_idx_type new_r = r2 - r1 + 1;

  ComplexColumnVector result (new_r);

  for (octave_idx_type i = 0; i < new_r; i++)
    result.elem (i) = elem (r1+i);

  return result;
}

ComplexColumnVector
ComplexColumnVector::extract_n (octave_idx_type r1, octave_idx_type n) const
{
  ComplexColumnVector result (n);

  for (octave_idx_type i = 0; i < n; i++)
    result.elem (i) = elem (r1+i);

  return result;
}

// column vector by column vector -> column vector operations

ComplexColumnVector&
ComplexColumnVector::operator += (const ColumnVector& a)
{
  octave_idx_type len = length ();

  octave_idx_type a_len = a.length ();

  if (len != a_len)
    {
      gripe_nonconformant ("operator +=", len, a_len);
      return *this;
    }

  if (len == 0)
    return *this;

  Complex *d = fortran_vec (); // Ensures only one reference to my privates!

  mx_inline_add2 (len, d, a.data ());
  return *this;
}

ComplexColumnVector&
ComplexColumnVector::operator -= (const ColumnVector& a)
{
  octave_idx_type len = length ();

  octave_idx_type a_len = a.length ();

  if (len != a_len)
    {
      gripe_nonconformant ("operator -=", len, a_len);
      return *this;
    }

  if (len == 0)
    return *this;

  Complex *d = fortran_vec (); // Ensures only one reference to my privates!

  mx_inline_sub2 (len, d, a.data ());
  return *this;
}

// matrix by column vector -> column vector operations

ComplexColumnVector
operator * (const ComplexMatrix& m, const ColumnVector& a)
{
  ComplexColumnVector tmp (a);
  return m * tmp;
}

ComplexColumnVector
operator * (const ComplexMatrix& m, const ComplexColumnVector& a)
{
  ComplexColumnVector retval;

  octave_idx_type nr = m.rows ();
  octave_idx_type nc = m.cols ();

  octave_idx_type a_len = a.length ();

  if (nc != a_len)
    gripe_nonconformant ("operator *", nr, nc, a_len, 1);
  else
    {
      retval.clear (nr);

      if (nr != 0)
        {
          Complex *y = retval.fortran_vec ();

          F77_XFCN (zgemv, ZGEMV, (F77_CONST_CHAR_ARG2 ("N", 1),
                                   nr, nc, 1.0, m.data (), nr,
                                   a.data (), 1, 0.0, y, 1
                                   F77_CHAR_ARG_LEN (1)));
        }
    }

  return retval;
}

// matrix by column vector -> column vector operations

ComplexColumnVector
operator * (const Matrix& m, const ComplexColumnVector& a)
{
  ComplexMatrix tmp (m);
  return tmp * a;
}

// diagonal matrix by column vector -> column vector operations

ComplexColumnVector
operator * (const DiagMatrix& m, const ComplexColumnVector& a)
{
  octave_idx_type nr = m.rows ();
  octave_idx_type nc = m.cols ();

  octave_idx_type a_len = a.length ();

  if (nc != a_len)
    {
      gripe_nonconformant ("operator *", nr, nc, a_len, 1);
      return ComplexColumnVector ();
    }

  if (nc == 0 || nr == 0)
    return ComplexColumnVector (0);

  ComplexColumnVector result (nr);

  for (octave_idx_type i = 0; i < a_len; i++)
    result.elem (i) = a.elem (i) * m.elem (i, i);

  for (octave_idx_type i = a_len; i < nr; i++)
    result.elem (i) = 0.0;

  return result;
}

ComplexColumnVector
operator * (const ComplexDiagMatrix& m, const ColumnVector& a)
{
  octave_idx_type nr = m.rows ();
  octave_idx_type nc = m.cols ();

  octave_idx_type a_len = a.length ();

  if (nc != a_len)
    {
      gripe_nonconformant ("operator *", nr, nc, a_len, 1);
      return ComplexColumnVector ();
    }

  if (nc == 0 || nr == 0)
    return ComplexColumnVector (0);

  ComplexColumnVector result (nr);

  for (octave_idx_type i = 0; i < a_len; i++)
    result.elem (i) = a.elem (i) * m.elem (i, i);

  for (octave_idx_type i = a_len; i < nr; i++)
    result.elem (i) = 0.0;

  return result;
}

ComplexColumnVector
operator * (const ComplexDiagMatrix& m, const ComplexColumnVector& a)
{
  octave_idx_type nr = m.rows ();
  octave_idx_type nc = m.cols ();

  octave_idx_type a_len = a.length ();

  if (nc != a_len)
    {
      gripe_nonconformant ("operator *", nr, nc, a_len, 1);
      return ComplexColumnVector ();
    }

  if (nc == 0 || nr == 0)
    return ComplexColumnVector (0);

  ComplexColumnVector result (nr);

  for (octave_idx_type i = 0; i < a_len; i++)
    result.elem (i) = a.elem (i) * m.elem (i, i);

  for (octave_idx_type i = a_len; i < nr; i++)
    result.elem (i) = 0.0;

  return result;
}

// other operations

Complex
ComplexColumnVector::min (void) const
{
  octave_idx_type len = length ();
  if (len == 0)
    return 0.0;

  Complex res = elem (0);
  double absres = std::abs (res);

  for (octave_idx_type i = 1; i < len; i++)
    if (std::abs (elem (i)) < absres)
      {
        res = elem (i);
        absres = std::abs (res);
      }

  return res;
}

Complex
ComplexColumnVector::max (void) const
{
  octave_idx_type len = length ();
  if (len == 0)
    return 0.0;

  Complex res = elem (0);
  double absres = std::abs (res);

  for (octave_idx_type i = 1; i < len; i++)
    if (std::abs (elem (i)) > absres)
      {
        res = elem (i);
        absres = std::abs (res);
      }

  return res;
}

// i/o

std::ostream&
operator << (std::ostream& os, const ComplexColumnVector& a)
{
//  int field_width = os.precision () + 7;
  for (octave_idx_type i = 0; i < a.length (); i++)
    os << /* setw (field_width) << */ a.elem (i) << "\n";
  return os;
}

std::istream&
operator >> (std::istream& is, ComplexColumnVector& a)
{
  octave_idx_type len = a.length();

  if (len > 0)
    {
      double tmp;
      for (octave_idx_type i = 0; i < len; i++)
        {
          is >> tmp;
          if (is)
            a.elem (i) = tmp;
          else
            break;
        }
    }
  return is;
}