ov-re-sparse.cc

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////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 1998-2021 The Octave Project Developers
//
// See the file COPYRIGHT.md in the top-level directory of this
// distribution or <https://octave.org/copyright/>.
//
// 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
// <https://www.gnu.org/licenses/>.
//
////////////////////////////////////////////////////////////////////////
 
#if defined (HAVE_CONFIG_H)
#  include "config.h"
#endif
 
#include <istream>
#include <limits>
#include <ostream>
#include <vector>
 
#include "lo-specfun.h"
#include "lo-mappers.h"
#include "oct-locbuf.h"
 
#include "mxarray.h"
#include "ov-base.h"
#include "ov-scalar.h"
#include "errwarn.h"
 
#include "oct-hdf5.h"
#include "ls-hdf5.h"
 
#include "ov-re-sparse.h"
 
#include "ov-base-sparse.h"
#include "ov-base-sparse.cc"
 
#include "ov-bool-sparse.h"
 
 
template class OCTINTERP_API octave_base_sparse<SparseMatrix>;
 
DEFINE_OV_TYPEID_FUNCTIONS_AND_DATA (octave_sparse_matrix, "sparse matrix",
                                     "double");
 
idx_vector
octave_sparse_matrix::index_vector (bool /* require_integers */) const
{
  if (matrix.numel () == matrix.nnz ())
    return idx_vector (array_value ());
  else
    {
      std::string nm = '<' + type_name () + '>';
      octave::err_invalid_index (nm.c_str ());
    }
}
 
octave_base_value *
octave_sparse_matrix::try_narrowing_conversion (void)
{
  octave_base_value *retval = nullptr;
 
  if (Vsparse_auto_mutate)
    {
      // Don't use numel, since it can overflow for very large matrices
      // Note that for the second test, this means it becomes approximative
      // since it involves a cast to double to avoid issues of overflow
      if (matrix.rows () == 1 && matrix.cols () == 1)
        {
          // Const copy of the matrix, so the right version of () operator used
          const SparseMatrix tmp (matrix);
 
          retval = new octave_scalar (tmp (0));
        }
      else if (matrix.cols () > 0 && matrix.rows () > 0
               && (double (matrix.byte_size ()) > double (matrix.rows ())
                   * double (matrix.cols ()) * sizeof (double)))
        retval = new octave_matrix (matrix.matrix_value ());
    }
 
  return retval;
}
 
double
octave_sparse_matrix::double_value (bool) const
{
  if (isempty ())
    err_invalid_conversion ("real sparse matrix", "real scalar");
 
  if (numel () > 1)
    warn_implicit_conversion ("Octave:array-to-scalar",
                              "real sparse matrix", "real scalar");
 
  return matrix(0, 0);
}
 
Complex
octave_sparse_matrix::complex_value (bool) const
{
  // FIXME: maybe this should be a function, valid_as_scalar()
  if (rows () == 0 || columns () == 0)
    err_invalid_conversion ("real sparse matrix", "complex scalar");
 
  if (numel () > 1)
    warn_implicit_conversion ("Octave:array-to-scalar",
                              "real sparse matrix", "complex scalar");
 
  return Complex (matrix(0, 0), 0);
}
 
Matrix
octave_sparse_matrix::matrix_value (bool) const
{
  return matrix.matrix_value ();
}
 
boolNDArray
octave_sparse_matrix::bool_array_value (bool warn) const
{
  NDArray m = matrix.matrix_value ();
 
  if (m.any_element_is_nan ())
    octave::err_nan_to_logical_conversion ();
  if (warn && m.any_element_not_one_or_zero ())
    warn_logical_conversion ();
 
  return boolNDArray (m);
}
 
charNDArray
octave_sparse_matrix::char_array_value (bool) const
{
  charNDArray retval (dims (), 0);
  octave_idx_type nc = matrix.cols ();
  octave_idx_type nr = matrix.rows ();
 
  for (octave_idx_type j = 0; j < nc; j++)
    for (octave_idx_type i = matrix.cidx (j); i < matrix.cidx (j+1); i++)
      retval(matrix.ridx (i) + nr * j) = static_cast<char> (matrix.data (i));
 
  return retval;
}
 
ComplexMatrix
octave_sparse_matrix::complex_matrix_value (bool) const
{
  return ComplexMatrix (matrix.matrix_value ());
}
 
ComplexNDArray
octave_sparse_matrix::complex_array_value (bool) const
{
  return ComplexNDArray (ComplexMatrix (matrix.matrix_value ()));
}
 
NDArray
octave_sparse_matrix::array_value (bool) const
{
  return NDArray (matrix.matrix_value ());
}
 
SparseBoolMatrix
octave_sparse_matrix::sparse_bool_matrix_value (bool warn) const
{
  if (matrix.any_element_is_nan ())
    octave::err_nan_to_logical_conversion ();
  if (warn && matrix.any_element_not_one_or_zero ())
    warn_logical_conversion ();
 
  return mx_el_ne (matrix, 0.0);
}
 
octave_value
octave_sparse_matrix::convert_to_str_internal (bool, bool, char type) const
{
  octave_value retval;
  dim_vector dv = dims ();
  octave_idx_type nel = dv.numel ();
 
  if (nel == 0)
    {
      char s = '\0';
      retval = octave_value (&s, type);
    }
  else
    {
      octave_idx_type nr = matrix.rows ();
      octave_idx_type nc = matrix.cols ();
      charNDArray chm (dv, static_cast<char> (0));
 
      bool warned = false;
 
      for (octave_idx_type j = 0; j < nc; j++)
        for (octave_idx_type i = matrix.cidx (j);
             i < matrix.cidx (j+1); i++)
          {
            octave_quit ();
 
            double d = matrix.data (i);
 
            if (octave::math::isnan (d))
              octave::err_nan_to_character_conversion ();
 
            int ival = octave::math::nint (d);
 
            if (ival < 0 || ival > std::numeric_limits<unsigned char>::max ())
              {
                // FIXME: is there something better we could do?
 
                ival = 0;
 
                if (! warned)
                  {
                    ::warning ("range error for conversion to character value");
                    warned = true;
                  }
              }
 
            chm(matrix.ridx (i) + j * nr) = static_cast<char> (ival);
          }
 
      retval = octave_value (chm, type);
    }
 
  return retval;
}
 
octave_value
octave_sparse_matrix::as_double (void) const
{
  return this->matrix;
}
 
bool
octave_sparse_matrix::save_binary (std::ostream& os, bool save_as_floats)
{
  dim_vector dv = this->dims ();
  if (dv.ndims () < 1)
    return false;
 
  // Ensure that additional memory is deallocated
  matrix.maybe_compress ();
 
  int nr = dv(0);
  int nc = dv(1);
  int nz = nnz ();
 
  int32_t itmp;
  // Use negative value for ndims to be consistent with other formats
  itmp = -2;
  os.write (reinterpret_cast<char *> (&itmp), 4);
 
  itmp = nr;
  os.write (reinterpret_cast<char *> (&itmp), 4);
 
  itmp = nc;
  os.write (reinterpret_cast<char *> (&itmp), 4);
 
  itmp = nz;
  os.write (reinterpret_cast<char *> (&itmp), 4);
 
  save_type st = LS_DOUBLE;
  if (save_as_floats)
    {
      if (matrix.too_large_for_float ())
        {
          warning ("save: some values too large to save as floats --");
          warning ("save: saving as doubles instead");
        }
      else
        st = LS_FLOAT;
    }
  else if (matrix.nnz () > 8192) // FIXME: make this configurable.
    {
      double max_val, min_val;
      if (matrix.all_integers (max_val, min_val))
        st = get_save_type (max_val, min_val);
    }
 
  // add one to the printed indices to go from
  // zero-based to one-based arrays
  for (int i = 0; i < nc+1; i++)
    {
      octave_quit ();
      itmp = matrix.cidx (i);
      os.write (reinterpret_cast<char *> (&itmp), 4);
    }
 
  for (int i = 0; i < nz; i++)
    {
      octave_quit ();
      itmp = matrix.ridx (i);
      os.write (reinterpret_cast<char *> (&itmp), 4);
    }
 
  write_doubles (os, matrix.data (), st, nz);
 
  return true;
}
 
bool
octave_sparse_matrix::load_binary (std::istream& is, bool swap,
                                   octave::mach_info::float_format fmt)
{
  int32_t nz, nc, nr, tmp;
  char ctmp;
 
  if (! is.read (reinterpret_cast<char *> (&tmp), 4))
    return false;
 
  if (swap)
    swap_bytes<4> (&tmp);
 
  if (tmp != -2)
    error ("load: only 2-D sparse matrices are supported");
 
  if (! is.read (reinterpret_cast<char *> (&nr), 4))
    return false;
  if (! is.read (reinterpret_cast<char *> (&nc), 4))
    return false;
  if (! is.read (reinterpret_cast<char *> (&nz), 4))
    return false;
 
  if (swap)
    {
      swap_bytes<4> (&nr);
      swap_bytes<4> (&nc);
      swap_bytes<4> (&nz);
    }
 
  SparseMatrix m (static_cast<octave_idx_type> (nr),
                  static_cast<octave_idx_type> (nc),
                  static_cast<octave_idx_type> (nz));
 
  for (int i = 0; i < nc+1; i++)
    {
      octave_quit ();
      if (! is.read (reinterpret_cast<char *> (&tmp), 4))
        return false;
      if (swap)
        swap_bytes<4> (&tmp);
      m.xcidx (i) = tmp;
    }
 
  for (int i = 0; i < nz; i++)
    {
      octave_quit ();
      if (! is.read (reinterpret_cast<char *> (&tmp), 4))
        return false;
      if (swap)
        swap_bytes<4> (&tmp);
      m.xridx (i) = tmp;
    }
 
  if (! is.read (reinterpret_cast<char *> (&ctmp), 1))
    return false;
 
  read_doubles (is, m.xdata (), static_cast<save_type> (ctmp), nz, swap, fmt);
 
  if (! is)
    return false;
 
  if (! m.indices_ok ())
    return false;
 
  matrix = m;
 
  return true;
}
 
bool
octave_sparse_matrix::save_hdf5 (octave_hdf5_id loc_id, const char *name,
                                 bool save_as_floats)
{
  bool retval = false;
 
#if defined (HAVE_HDF5)
 
  dim_vector dv = dims ();
  int empty = save_hdf5_empty (loc_id, name, dv);
  if (empty)
    return (empty > 0);
 
  // Ensure that additional memory is deallocated
  matrix.maybe_compress ();
 
#if defined (HAVE_HDF5_18)
  hid_t group_hid = H5Gcreate (loc_id, name, octave_H5P_DEFAULT,
                               octave_H5P_DEFAULT, octave_H5P_DEFAULT);
#else
  hid_t group_hid = H5Gcreate (loc_id, name, 0);
#endif
  if (group_hid < 0)
    return false;
 
  hid_t space_hid, data_hid;
  space_hid = data_hid = -1;
  SparseMatrix m = sparse_matrix_value ();
  octave_idx_type tmp;
  hsize_t hdims[2];
 
  space_hid = H5Screate_simple (0, hdims, nullptr);
  if (space_hid < 0)
    {
      H5Gclose (group_hid);
      return false;
    }
#if defined (HAVE_HDF5_18)
  data_hid = H5Dcreate (group_hid, "nr", H5T_NATIVE_IDX, space_hid,
                        octave_H5P_DEFAULT, octave_H5P_DEFAULT, octave_H5P_DEFAULT);
#else
  data_hid = H5Dcreate (group_hid, "nr", H5T_NATIVE_IDX, space_hid,
                        octave_H5P_DEFAULT);
#endif
  if (data_hid < 0)
    {
      H5Sclose (space_hid);
      H5Gclose (group_hid);
      return false;
    }
 
  tmp = m.rows ();
  retval = H5Dwrite (data_hid, H5T_NATIVE_IDX, octave_H5S_ALL, octave_H5S_ALL,
                     octave_H5P_DEFAULT, &tmp) >= 0;
  H5Dclose (data_hid);
  if (! retval)
    {
      H5Sclose (space_hid);
      H5Gclose (group_hid);
      return false;
    }
#if defined (HAVE_HDF5_18)
  data_hid = H5Dcreate (group_hid, "nc", H5T_NATIVE_IDX, space_hid,
                        octave_H5P_DEFAULT, octave_H5P_DEFAULT, octave_H5P_DEFAULT);
#else
  data_hid = H5Dcreate (group_hid, "nc", H5T_NATIVE_IDX, space_hid,
                        octave_H5P_DEFAULT);
#endif
  if (data_hid < 0)
    {
      H5Sclose (space_hid);
      H5Gclose (group_hid);
      return false;
    }
 
  tmp = m.cols ();
  retval = H5Dwrite (data_hid, H5T_NATIVE_IDX, octave_H5S_ALL, octave_H5S_ALL,
                     octave_H5P_DEFAULT, &tmp) >= 0;
  H5Dclose (data_hid);
  if (! retval)
    {
      H5Sclose (space_hid);
      H5Gclose (group_hid);
      return false;
    }
 
#if defined (HAVE_HDF5_18)
  data_hid = H5Dcreate (group_hid, "nz", H5T_NATIVE_IDX, space_hid,
                        octave_H5P_DEFAULT, octave_H5P_DEFAULT, octave_H5P_DEFAULT);
#else
  data_hid = H5Dcreate (group_hid, "nz", H5T_NATIVE_IDX, space_hid,
                        octave_H5P_DEFAULT);
#endif
  if (data_hid < 0)
    {
      H5Sclose (space_hid);
      H5Gclose (group_hid);
      return false;
    }
 
  tmp = m.nnz ();
  retval = H5Dwrite (data_hid, H5T_NATIVE_IDX, octave_H5S_ALL, octave_H5S_ALL,
                     octave_H5P_DEFAULT, &tmp) >= 0;
  H5Dclose (data_hid);
  if (! retval)
    {
      H5Sclose (space_hid);
      H5Gclose (group_hid);
      return false;
    }
 
  H5Sclose (space_hid);
 
  hdims[0] = m.cols () + 1;
  hdims[1] = 1;
 
  space_hid = H5Screate_simple (2, hdims, nullptr);
 
  if (space_hid < 0)
    {
      H5Gclose (group_hid);
      return false;
    }
 
#if defined (HAVE_HDF5_18)
  data_hid = H5Dcreate (group_hid, "cidx", H5T_NATIVE_IDX, space_hid,
                        octave_H5P_DEFAULT, octave_H5P_DEFAULT, octave_H5P_DEFAULT);
#else
  data_hid = H5Dcreate (group_hid, "cidx", H5T_NATIVE_IDX, space_hid,
                        octave_H5P_DEFAULT);
#endif
  if (data_hid < 0)
    {
      H5Sclose (space_hid);
      H5Gclose (group_hid);
      return false;
    }
 
  octave_idx_type *itmp = m.xcidx ();
  retval = H5Dwrite (data_hid, H5T_NATIVE_IDX, octave_H5S_ALL, octave_H5S_ALL,
                     octave_H5P_DEFAULT, itmp) >= 0;
  H5Dclose (data_hid);
  if (! retval)
    {
      H5Sclose (space_hid);
      H5Gclose (group_hid);
      return false;
    }
 
  H5Sclose (space_hid);
 
  hdims[0] = m.nnz ();
  hdims[1] = 1;
 
  space_hid = H5Screate_simple (2, hdims, nullptr);
 
  if (space_hid < 0)
    {
      H5Gclose (group_hid);
      return false;
    }
#if defined (HAVE_HDF5_18)
  data_hid = H5Dcreate (group_hid, "ridx", H5T_NATIVE_IDX, space_hid,
                        octave_H5P_DEFAULT, octave_H5P_DEFAULT, octave_H5P_DEFAULT);
#else
  data_hid = H5Dcreate (group_hid, "ridx", H5T_NATIVE_IDX, space_hid,
                        octave_H5P_DEFAULT);
#endif
  if (data_hid < 0)
    {
      H5Sclose (space_hid);
      H5Gclose (group_hid);
      return false;
    }
 
  itmp = m.xridx ();
  retval = H5Dwrite (data_hid, H5T_NATIVE_IDX, octave_H5S_ALL, octave_H5S_ALL,
                     octave_H5P_DEFAULT, itmp) >= 0;
  H5Dclose (data_hid);
  if (! retval)
    {
      H5Sclose (space_hid);
      H5Gclose (group_hid);
      return false;
    }
 
  hid_t save_type_hid = H5T_NATIVE_DOUBLE;
 
  if (save_as_floats)
    {
      if (m.too_large_for_float ())
        {
          warning ("save: some values too large to save as floats --");
          warning ("save: saving as doubles instead");
        }
      else
        save_type_hid = H5T_NATIVE_FLOAT;
    }
#if defined (HAVE_HDF5_INT2FLOAT_CONVERSIONS)
  // hdf5 currently doesn't support float/integer conversions
  else
    {
      double max_val, min_val;
 
      if (m.all_integers (max_val, min_val))
        save_type_hid
          = save_type_to_hdf5 (get_save_type (max_val, min_val));
    }
#endif
 
#if defined (HAVE_HDF5_18)
  data_hid = H5Dcreate (group_hid, "data", save_type_hid, space_hid,
                        octave_H5P_DEFAULT, octave_H5P_DEFAULT, octave_H5P_DEFAULT);
#else
  data_hid = H5Dcreate (group_hid, "data", save_type_hid, space_hid,
                        octave_H5P_DEFAULT);
#endif
  if (data_hid < 0)
    {
      H5Sclose (space_hid);
      H5Gclose (group_hid);
      return false;
    }
 
  double *dtmp = m.xdata ();
  retval = H5Dwrite (data_hid, H5T_NATIVE_DOUBLE, octave_H5S_ALL, octave_H5S_ALL,
                     octave_H5P_DEFAULT, dtmp) >= 0;
  H5Dclose (data_hid);
  H5Sclose (space_hid);
  H5Gclose (group_hid);
 
#else
  octave_unused_parameter (loc_id);
  octave_unused_parameter (name);
  octave_unused_parameter (save_as_floats);
 
  warn_save ("hdf5");
#endif
 
  return retval;
}
 
bool
octave_sparse_matrix::load_hdf5 (octave_hdf5_id loc_id, const char *name)
{
  bool retval = false;
 
#if defined (HAVE_HDF5)
 
  octave_idx_type nr, nc, nz;
  hid_t group_hid, data_hid, space_hid;
  hsize_t rank;
 
  dim_vector dv;
  int empty = load_hdf5_empty (loc_id, name, dv);
  if (empty > 0)
    matrix.resize (dv);
  if (empty)
    return (empty > 0);
 
#if defined (HAVE_HDF5_18)
  group_hid = H5Gopen (loc_id, name, octave_H5P_DEFAULT);
#else
  group_hid = H5Gopen (loc_id, name);
#endif
  if (group_hid < 0) return false;
 
#if defined (HAVE_HDF5_18)
  data_hid = H5Dopen (group_hid, "nr", octave_H5P_DEFAULT);
#else
  data_hid = H5Dopen (group_hid, "nr");
#endif
  space_hid = H5Dget_space (data_hid);
  rank = H5Sget_simple_extent_ndims (space_hid);
 
  if (rank != 0)
    {
      H5Dclose (data_hid);
      H5Gclose (group_hid);
      return false;
    }
 
  if (H5Dread (data_hid, H5T_NATIVE_IDX, octave_H5S_ALL, octave_H5S_ALL,
               octave_H5P_DEFAULT, &nr) < 0)
    {
      H5Dclose (data_hid);
      H5Gclose (group_hid);
      return false;
    }
 
  H5Dclose (data_hid);
 
#if defined (HAVE_HDF5_18)
  data_hid = H5Dopen (group_hid, "nc", octave_H5P_DEFAULT);
#else
  data_hid = H5Dopen (group_hid, "nc");
#endif
  space_hid = H5Dget_space (data_hid);
  rank = H5Sget_simple_extent_ndims (space_hid);
 
  if (rank != 0)
    {
      H5Dclose (data_hid);
      H5Gclose (group_hid);
      return false;
    }
 
  if (H5Dread (data_hid, H5T_NATIVE_IDX, octave_H5S_ALL, octave_H5S_ALL,
               octave_H5P_DEFAULT, &nc) < 0)
    {
      H5Dclose (data_hid);
      H5Gclose (group_hid);
      return false;
    }
 
  H5Dclose (data_hid);
 
#if defined (HAVE_HDF5_18)
  data_hid = H5Dopen (group_hid, "nz", octave_H5P_DEFAULT);
#else
  data_hid = H5Dopen (group_hid, "nz");
#endif
  space_hid = H5Dget_space (data_hid);
  rank = H5Sget_simple_extent_ndims (space_hid);
 
  if (rank != 0)
    {
      H5Dclose (data_hid);
      H5Gclose (group_hid);
      return false;
    }
 
  if (H5Dread (data_hid, H5T_NATIVE_IDX, octave_H5S_ALL, octave_H5S_ALL,
               octave_H5P_DEFAULT, &nz) < 0)
    {
      H5Dclose (data_hid);
      H5Gclose (group_hid);
      return false;
    }
 
  H5Dclose (data_hid);
 
  SparseMatrix m (static_cast<octave_idx_type> (nr),
                  static_cast<octave_idx_type> (nc),
                  static_cast<octave_idx_type> (nz));
 
#if defined (HAVE_HDF5_18)
  data_hid = H5Dopen (group_hid, "cidx", octave_H5P_DEFAULT);
#else
  data_hid = H5Dopen (group_hid, "cidx");
#endif
  space_hid = H5Dget_space (data_hid);
  rank = H5Sget_simple_extent_ndims (space_hid);
 
  if (rank != 2)
    {
      H5Sclose (space_hid);
      H5Dclose (data_hid);
      H5Gclose (group_hid);
      return false;
    }
 
  OCTAVE_LOCAL_BUFFER (hsize_t, hdims, rank);
  OCTAVE_LOCAL_BUFFER (hsize_t, maxdims, rank);
 
  H5Sget_simple_extent_dims (space_hid, hdims, maxdims);
 
  if (static_cast<int> (hdims[0]) != nc + 1
      || static_cast<int> (hdims[1]) != 1)
    {
      H5Sclose (space_hid);
      H5Dclose (data_hid);
      H5Gclose (group_hid);
      return false;
    }
 
  octave_idx_type *itmp = m.xcidx ();
  if (H5Dread (data_hid, H5T_NATIVE_IDX, octave_H5S_ALL, octave_H5S_ALL,
               octave_H5P_DEFAULT, itmp) < 0)
    {
      H5Sclose (space_hid);
      H5Dclose (data_hid);
      H5Gclose (group_hid);
      return false;
    }
 
  H5Sclose (space_hid);
  H5Dclose (data_hid);
 
#if defined (HAVE_HDF5_18)
  data_hid = H5Dopen (group_hid, "ridx", octave_H5P_DEFAULT);
#else
  data_hid = H5Dopen (group_hid, "ridx");
#endif
  space_hid = H5Dget_space (data_hid);
  rank = H5Sget_simple_extent_ndims (space_hid);
 
  if (rank != 2)
    {
      H5Sclose (space_hid);
      H5Dclose (data_hid);
      H5Gclose (group_hid);
      return false;
    }
 
  H5Sget_simple_extent_dims (space_hid, hdims, maxdims);
 
  if (static_cast<int> (hdims[0]) != nz || static_cast<int> (hdims[1]) != 1)
    {
      H5Sclose (space_hid);
      H5Dclose (data_hid);
      H5Gclose (group_hid);
      return false;
    }
 
  itmp = m.xridx ();
  if (H5Dread (data_hid, H5T_NATIVE_IDX, octave_H5S_ALL, octave_H5S_ALL,
               octave_H5P_DEFAULT, itmp) < 0)
    {
      H5Sclose (space_hid);
      H5Dclose (data_hid);
      H5Gclose (group_hid);
      return false;
    }
 
  H5Sclose (space_hid);
  H5Dclose (data_hid);
 
#if defined (HAVE_HDF5_18)
  data_hid = H5Dopen (group_hid, "data", octave_H5P_DEFAULT);
#else
  data_hid = H5Dopen (group_hid, "data");
#endif
  space_hid = H5Dget_space (data_hid);
  rank = H5Sget_simple_extent_ndims (space_hid);
 
  if (rank != 2)
    {
      H5Sclose (space_hid);
      H5Dclose (data_hid);
      H5Gclose (group_hid);
      return false;
    }
 
  H5Sget_simple_extent_dims (space_hid, hdims, maxdims);
 
  if (static_cast<int> (hdims[0]) != nz || static_cast<int> (hdims[1]) != 1)
    {
      H5Sclose (space_hid);
      H5Dclose (data_hid);
      H5Gclose (group_hid);
      return false;
    }
 
  double *dtmp = m.xdata ();
 
  if (H5Dread (data_hid, H5T_NATIVE_DOUBLE, octave_H5S_ALL, octave_H5S_ALL,
               octave_H5P_DEFAULT, dtmp) >= 0
      && m.indices_ok ())
    {
      retval = true;
      matrix = m;
    }
 
  H5Sclose (space_hid);
  H5Dclose (data_hid);
  H5Gclose (group_hid);
 
#else
  octave_unused_parameter (loc_id);
  octave_unused_parameter (name);
 
  warn_load ("hdf5");
#endif
 
  return retval;
}
 
mxArray *
octave_sparse_matrix::as_mxArray (void) const
{
  mwSize nz = nzmax ();
  mwSize nr = rows ();
  mwSize nc = columns ();
  mxArray *retval = new mxArray (mxDOUBLE_CLASS, nr, nc, nz, mxREAL);
  double *pr = static_cast<double *> (retval->get_data ());
  mwIndex *ir = retval->get_ir ();
  mwIndex *jc = retval->get_jc ();
 
  for (mwIndex i = 0; i < nz; i++)
    {
      pr[i] = matrix.data (i);
      ir[i] = matrix.ridx (i);
    }
 
  for (mwIndex i = 0; i < nc + 1; i++)
    jc[i] = matrix.cidx (i);
 
  return retval;
}
 
octave_value
octave_sparse_matrix::map (unary_mapper_t umap) const
{
  switch (umap)
    {
    case umap_imag:
      return SparseMatrix (matrix.rows (), matrix.cols (), 0.0);
 
    case umap_real:
    case umap_conj:
      return matrix;
 
    // Mappers handled specially.
#define ARRAY_METHOD_MAPPER(UMAP, FCN)        \
    case umap_ ## UMAP:                       \
      return octave_value (matrix.FCN ())
 
    ARRAY_METHOD_MAPPER (abs, abs);
 
#define ARRAY_MAPPER(UMAP, TYPE, FCN)                 \
    case umap_ ## UMAP:                               \
      return octave_value (matrix.map<TYPE> (FCN))
 
    ARRAY_MAPPER (acos, Complex, octave::math::rc_acos);
    ARRAY_MAPPER (acosh, Complex, octave::math::rc_acosh);
    ARRAY_MAPPER (angle, double, std::arg);
    ARRAY_MAPPER (arg, double,std::arg);
    ARRAY_MAPPER (asin, Complex, octave::math::rc_asin);
    ARRAY_MAPPER (asinh, double, octave::math::asinh);
    ARRAY_MAPPER (atan, double, ::atan);
    ARRAY_MAPPER (atanh, Complex, octave::math::rc_atanh);
    ARRAY_MAPPER (erf, double, octave::math::erf);
    ARRAY_MAPPER (erfinv, double, octave::math::erfinv);
    ARRAY_MAPPER (erfcinv, double, octave::math::erfcinv);
    ARRAY_MAPPER (erfc, double, octave::math::erfc);
    ARRAY_MAPPER (erfcx, double, octave::math::erfcx);
    ARRAY_MAPPER (erfi, double, octave::math::erfi);
    ARRAY_MAPPER (dawson, double, octave::math::dawson);
    ARRAY_MAPPER (gamma, double, octave::math::gamma);
    ARRAY_MAPPER (lgamma, Complex, octave::math::rc_lgamma);
    ARRAY_MAPPER (cbrt, double, octave::math::cbrt);
    ARRAY_MAPPER (ceil, double, ::ceil);
    ARRAY_MAPPER (cos, double, ::cos);
    ARRAY_MAPPER (cosh, double, ::cosh);
    ARRAY_MAPPER (exp, double, ::exp);
    ARRAY_MAPPER (expm1, double, octave::math::expm1);
    ARRAY_MAPPER (fix, double, octave::math::fix);
    ARRAY_MAPPER (floor, double, ::floor);
    ARRAY_MAPPER (log, Complex, octave::math::rc_log);
    ARRAY_MAPPER (log2, Complex, octave::math::rc_log2);
    ARRAY_MAPPER (log10, Complex, octave::math::rc_log10);
    ARRAY_MAPPER (log1p, Complex, octave::math::rc_log1p);
    ARRAY_MAPPER (round, double, octave::math::round);
    ARRAY_MAPPER (roundb, double, octave::math::roundb);
    ARRAY_MAPPER (signum, double, octave::math::signum);
    ARRAY_MAPPER (sin, double, ::sin);
    ARRAY_MAPPER (sinh, double, ::sinh);
    ARRAY_MAPPER (sqrt, Complex, octave::math::rc_sqrt);
    ARRAY_MAPPER (tan, double, ::tan);
    ARRAY_MAPPER (tanh, double, ::tanh);
    ARRAY_MAPPER (isnan, bool, octave::math::isnan);
    ARRAY_MAPPER (isna, bool, octave::math::isna);
    ARRAY_MAPPER (isinf, bool, octave::math::isinf);
    ARRAY_MAPPER (isfinite, bool, octave::math::isfinite);
 
    default: // Attempt to go via dense matrix.
      return octave_base_sparse<SparseMatrix>::map (umap);
    }
}