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Copyright (C) 2006, 2007 Thomas Kasper, <thomaskasper@gmx.net>

This program 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 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
GNU General Public License for more details.

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

# if !defined(grad_h)
#define grad_h 1

#pragma interface

#include <octave/config.h>
#include <octave/ov-base.h>
#include <octave/ov.h>
#include <octave/ov-scalar.h>

class octave_value_list;

class octave_gradient : public octave_base_value 
      enum init_type {
            constant, dependent

      octave_gradient (void)
            : xval (octave_value ()),
              dval (NDArray (dim_vector (num_derivatives, 0))) {}

      octave_gradient (const octave_value& v, init_type t = dependent);
      octave_gradient (const octave_gradient& g)
            : xval (g.xval), dval (g.dval) {}

      ~octave_gradient (void) {}

      octave_base_value * clone (void) const 
            { return new octave_gradient (*this); }

      octave_base_value * empty_clone (void) const
            { return new octave_gradient (); }

      size_t byte_size (void) const 
            { return xval.byte_size () + dval.byte_size (); }

      void print (std::ostream& os, bool pr_as_read_syntax = false) const;
      octave_value_list dotref (const octave_value_list& idx);
      octave_value subsref (const std::string& type, const std::list<octave_value_list>& idx);

      octave_value_list subsref (const std::string& type,
                           const std::list<octave_value_list>& idx, int)
        { return subsref (type, idx); }

      octave_value subsasgn (const std::string& type, const std::list<octave_value_list>& idx, const octave_value& rhs);
      octave_value do_index_op (const octave_value_list& idx, bool resize_ok);
      octave_value resize (const dim_vector& dv, bool fill = 0) const;
      octave_value reshape (const dim_vector& dv) const
        {  return new octave_gradient (x ().reshape (dv), dx ()); }

      /* assignment from dependent term (=gradient) */
      void assign (const octave_value_list& idx, const octave_gradient& rhs);
      /* assignment from non-dependent term */
      template<class T> inline void assign (const octave_value_list& idx, const T& rhs)
            { assign_const (idx, rhs.clone ()); }

      bool is_matrix_type (void) const { return xval.is_matrix_type (); }
      bool is_scalar_type (void) const { return xval.is_scalar_type (); }
      bool is_real_type (void) const { return xval.is_real_type (); }
      bool is_complex_type (void) const { return xval.is_complex_type (); }
      bool is_sparse_type (void) const { return xval.is_sparse_type (); }
      bool is_defined (void) const { return true; }
      bool is_numeric_type (void) const { return true; }
      bool is_constant (void) const { return true; }
      bool is_map (void) const { return true; }
      dim_vector dims (void) const { return xval.dims (); }

      MatrixType matrix_type (void) const { return xval.matrix_type (); }
      MatrixType matrix_type (const MatrixType& typ) const { return xval.matrix_type (); }
      inline octave_idx_type nderv (void) const { return dval.rows (); }
      inline const octave_value& x () const { return xval; }
      inline const octave_value& dx () const { return dval; }
      octave_value jacobian () const;

      // differentiation makes no sense here
      // behave like the corresponding non-AD-type
      idx_vector index_vector (void) const { return xval.index_vector (); }
      octave_value all (int dim = 0) const { return xval.all (dim); }
      octave_value any (int dim = 0) const { return xval.any (dim); }

      double double_value (bool frc_str_conv) const;
      double scalar_value (bool frc_str_conv) const;
      NDArray array_value (bool frc_str_conv = false) const;
      octave_value convert_to_str_internal (bool pad, bool force, char type) const;

      enum storage_mode {
            dense  = 0,
            sparse = 1

      static inline bool sparse_storage_mode ()
      { // query preferred storage mode for jacobian
            return use_sparse_jacobian; 
      static inline void set_storage_mode (storage_mode val)
      { // set preferred storage mode for jacobian
            use_sparse_jacobian = static_cast<bool>(val); 
      // io methods
      bool save_ascii (std::ostream& os);
      bool load_ascii (std::istream& is);
      bool save_binary (std::ostream& os, bool& save_as_floats);
      bool load_binary (std::istream& is, bool swap, oct_mach_info::float_format fmt);

      // should be protected, but I don't care to list all ops as friends
      octave_gradient (const octave_value& xv, const octave_value& dv) : xval (xv), dval (dv) {}

      void assign_const (const octave_value_list& idx, const octave_value& rhs);
      /* these may be anything: scalar or matrix, complex or real, sparse or dense,
       so let's be vague about it: */
      octave_value xval;
      octave_value dval;

      static octave_idx_type num_derivatives;
      static bool use_sparse_jacobian;



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