linspace.hpp

// -*- mode: c++; fill-column: 80; c-basic-offset: 2; indent-tabs-mode: nil -*-
/*
    Copyright (c) 2010 Juan Jose Garcia Ripoll

    Tensor is free software; you can redistribute it and/or modify it
    under the terms of the GNU Library 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
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Library General Public License for more details.

    You should have received a copy of the GNU General Public License along
    with this program; if not, write to the Free Software Foundation, Inc.,
    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/

#ifndef TENSOR_LINSPACE_HPP
#define TENSOR_LINSPACE_HPP

#include <tensor/gen.h>

namespace tensor {

  template<typename elt_t>
  static inline const Tensor<elt_t>
  do_linspace(const Tensor<elt_t> &min, const Tensor<elt_t> &max, index n = 100)
  {
    index d = min.size();
    Tensor<elt_t> output(d, n);
    if (n == 1) {
      output = min;
    } else if (n) {
      const Tensor<elt_t> base = reshape(max, d);
      const Tensor<elt_t> delta = reshape((max - min) / (n - 1.0), d);
      for (index i = 0; i < n; i++) {
        output.at(range(), range(i)) = delta * (double)i + min;
      }
    }
    if (d == 1)
      return reshape(output, n);
    else
      return reshape(output, min.dimensions() << (igen << n));
  }


} // namespace tensor

#endif // TENSOR_LINSPACE_HPP