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// Copyright (C) 2010,2011 Olaf Till <i7tiol@t-online.de>
//
// 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 3 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 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/>.
#include <octave/oct.h>
#include <octave/ov-struct.h>
template<class NDA>
static Cell
do_partarray (const NDA& a, const std::string& fname,
const octave_value_list& args)
{
// FIXME: some type-independent code should probably go into an
// extra function (no template) to avoid its repetitive instanciation
int nidc = args.length () - 1;
dim_vector dv = a.dims ();
int ndims = dv.length ();
int maxdims = ndims > nidc ? ndims : nidc;
Array<octave_idx_type> alldims (dim_vector (maxdims, 1));
for (int i = 0; i < maxdims; alldims(i) = i < ndims ? dv(i) : 1, i++);
int nc = 1;
Array<int> nidx (dim_vector (maxdims, 1));
// Octave-3.2.4 reports "missing symbol" with Array<Array< > >,
// though 3.3.54+ does not
Array<octave_idx_type> bidc [maxdims], eidc [maxdims];
//
Array<octave_idx_type> step (dim_vector (maxdims, 1));
step(0) = 1;
for (int i = 0; i < maxdims; i++)
{
int cnidx;
octave_value arg;
if (i >= nidc || (arg = args(i + 1)).is_empty ())
{
Array<octave_idx_type> bidx (dim_vector (1, 1), 1);
Array<octave_idx_type> eidx (dim_vector (1, 1), alldims(i));
bidc[i] = bidx;
eidc[i] = eidx;
cnidx = 1;
}
else
{
dim_vector argdims = arg.dims ();
if (argdims.length () > 2 || argdims(1) != 2)
{
error ("%s: argument %i: wrong dimensions",
fname.c_str (), i + 2);
return Cell ();
}
cnidx =
(bidc[i] = octave_value (arg.matrix_value ().column (0)).
octave_idx_type_vector_value ()).length ();
eidc[i] = octave_value (arg.matrix_value ().column (1)).
octave_idx_type_vector_value ();
for (int j = 0; j < cnidx; j++)
{
if (bidc[i](j) < 1 || eidc[i](j) > alldims(i))
error ("%s: index given by row %i of argument %i exceeds array dimensions",
fname.c_str (), j, i + 2);
if (bidc[i](j) > eidc[i](j))
// so later length calculations yield 0
eidc[i](j) = bidc[i](j) - 1;
}
}
nc *= (nidx(i) = cnidx);
if (i < maxdims - 1)
step(i + 1) = step(i) * alldims(i);
}
if (error_state)
return Cell ();
dim_vector rdv (nc, 1);
Cell retval (rdv);
// preparations are done, start now; take care, indices are
// one-based, since given by user
// go through all combinations of indices into user indices
Array<int> cidx (dim_vector (maxdims, 1), 0); // current combination
for (int i = 0; i < nc; i++)
{
// set cursor to start of subarray and calculate some lengths
octave_idx_type n = 1, cursor = 0;
Array<octave_idx_type> lengths (dim_vector (maxdims, 1));
for (int j = 0; j < maxdims; j++)
{
octave_idx_type begin = bidc[j](cidx(j));
octave_idx_type end = eidc[j](cidx(j));
octave_idx_type length = end + 1 - begin;
lengths(j) = length;
n *= length;
cursor += (begin - 1) * step(j);
}
Array<octave_idx_type> starts (dim_vector (maxdims - 1, 1), cursor);
Array<octave_idx_type> idx_cursors (dim_vector (maxdims, 1), 0);
// copy the subarray
dim_vector subdv;
subdv.resize (maxdims);
for (octave_idx_type k = 0; k < maxdims; k++)
subdv(k) = lengths(k);
NDA asub (subdv);
for (octave_idx_type k = 0; k < n; k++)
{
asub(k) = a(cursor++);
idx_cursors(0)++;
for (int l = 0; l < maxdims - 1; l++)
{
if (idx_cursors(l) == lengths(l))
{
idx_cursors(l) = 0;
idx_cursors(l + 1)++;
cursor = starts(l) + step(l + 1);
for (int m = 0; m <= l; starts(m) = cursor, m++);
}
}
}
// insert subarray into cell
retval(i, 0) = octave_value (asub);
// prepare next combination
cidx(0)++;
for (int j = 0; j < maxdims - 1; j++)
if (cidx(j) >= nidx(j))
{
cidx(j) = 0;
cidx(j + 1)++;
}
}
return retval;
}
DEFUN_DLD (partarray, args, ,
"-*- texinfo -*-\n\
@deftypefn {Loadable Function} {} partarray (@var{a}, @var{idx}, @dots{})\n\
Return a column cell array with subarrays of the @var{a}. Start and end indices of subarrays are given in the rows of @var{idx}. @var{idx} can be given for each dimension, empty @var{idx} means no partitioning in the respective dimension. Order of returned subarrays: rows of @var{idx} of some dimension are completely used before using the next row of @var{idx} of the higher dimension.\n\
\n\
Does not work with structure arrays at the moment.\n\
@end deftypefn")
{
static bool warned = false;
if (!warned){
warning_with_id ("Octave:deprecated-function",
"partarray has been deprecated, and will be removed in the future. Use `mat2cell' instead.");
warned = true;
}
std::string fname ("partarray");
if (args.length () == 0)
{
print_usage ();
return octave_value_list ();
}
octave_value array = args(0);
octave_value retval;
// The idea to use a function template was taken from Octaves
// num2cell in src/DLD-FUNCTIONS/cellfun.cc. The following code,
// which distinguishes the applicable types for the template, was
// cut and pasted from there and adapted.
if (array.is_bool_type ())
retval = do_partarray (array.bool_array_value (), fname, args);
else if (array.is_char_matrix ())
retval = do_partarray (array.char_array_value (), fname, args);
else if (array.is_numeric_type ())
{
if (array.is_integer_type ())
{
if (array.is_int8_type ())
retval = do_partarray (array.int8_array_value (), fname, args);
else if (array.is_int16_type ())
retval = do_partarray (array.int16_array_value (), fname, args);
else if (array.is_int32_type ())
retval = do_partarray (array.int32_array_value (), fname, args);
else if (array.is_int64_type ())
retval = do_partarray (array.int64_array_value (), fname, args);
else if (array.is_uint8_type ())
retval = do_partarray (array.uint8_array_value (), fname, args);
else if (array.is_uint16_type ())
retval = do_partarray (array.uint16_array_value (), fname, args);
else if (array.is_uint32_type ())
retval = do_partarray (array.uint32_array_value (), fname, args);
else if (array.is_uint64_type ())
retval = do_partarray (array.uint64_array_value (), fname, args);
}
else if (array.is_complex_type ())
{
if (array.is_single_type ())
retval = do_partarray (array.float_complex_array_value (),
fname, args);
else
retval = do_partarray (array.complex_array_value (), fname, args);
}
else
{
if (array.is_single_type ())
retval = do_partarray (array.float_array_value (), fname, args);
else
retval = do_partarray (array.array_value (), fname, args);
}
}
// FIXME: This seems to work in cellfun.cc, but not here ...
/*
else if (array.is_map ())
retval = do_partarray (array.map_value (), fname, args);
*/
else if (array.is_cell ())
retval = do_partarray (array.cell_value (), fname, args);
else
gripe_wrong_type_arg (fname, array);
return octave_value (retval);
}
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