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scripts/general/cell2mat.m

changeset 10289: 4b124317dc38
parent:eb63fbe60fab
author: John W. Eaton <jwe@octave.org>
date: Tue Feb 09 20:58:55 2010 -0500 (30 minutes ago)
permissions: -rw-r--r--
description: base_properties::set_children: account for hidden children 
     1## Copyright (C) 2005, 2006, 2007, 2008 Laurent Mazet

     2##

     3## This file is part of Octave.

     4##

     5## Octave is free software; you can redistribute it and/or modify it

     6## under the terms of the GNU General Public License as published by

     7## the Free Software Foundation; either version 3 of the License, or (at

     8## your option) any later version.

     9##

    10## Octave is distributed in the hope that it will be useful, but

    11## WITHOUT ANY WARRANTY; without even the implied warranty of

    12## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

    13## General Public License for more details.

    14##

    15## You should have received a copy of the GNU General Public License

    16## along with Octave; see the file COPYING.  If not, see

    17## <http://www.gnu.org/licenses/>.

    18

    19## -*- texinfo -*-

    20## @deftypefn {Function File} {@var{m} =} cell2mat (@var{c})

    21## Convert the cell array @var{c} into a matrix by concatenating all

    22## elements of @var{c} into a hyperrectangle.  Elements of @var{c} must

    23## be numeric, logical or char, and @code{cat} must be able to

    24## concatenate them together.

    25## @seealso{mat2cell, num2cell}

    26## @end deftypefn

    27

    28function m = cell2mat (c)

    29

    30  if (nargin != 1)

    31    print_usage ();

    32  endif

    33

    34  if (! iscell (c))

    35    error ("cell2mat: c is not a cell array");

    36  endif

    37  

    38  nb = numel (c);

    39

    40  ## We only want numeric, logical, and char matrices.

    41  valid = cellfun (@isnumeric, c);

    42  valid |= cellfun (@islogical, c);

    43  valid |= cellfun (@ischar, c);

    44

    45  if (! all (valid))

    46    error ("cell2mat: elements must be numeric, char or logical");

    47  endif

    48

    49  if (nb == 0)

    50    m = [];

    51  elseif (ndims (c) == 2)

    52    ## 2d case optimized

    53    [nr, nc] = size (c);

    54    if (nc > nr)

    55      c1 = cell (nr, 1);

    56      for i = 1 : nr

    57	c1{i} = [c{i,:}];

    58      endfor

    59      m = vertcat (c1 {:});

    60    else

    61      c1 = cell (nc, 1);

    62      for i = 1 : nc

    63	c1{i} = vertcat (c{:,i});

    64      endfor

    65      m = [c1{:}];

    66    endif

    67  else

    68    ## n dimensions case

    69    for k = ndims (c):-1:2,

    70      sz = size (c);

    71      sz(k) = 1;

    72      c1 = cell (sz);

    73      n1 = prod (sz);

    74      for i = 1:n1

    75        c1{i} = cat (k, c{i:n1:end});

    76      endfor

    77      c = c1;

    78    endfor

    79    m = cat (1, c1{:});

    80  endif

    81

    82endfunction

    83

    84## Tests

    85%!shared C, D, E, F

    86%! C = {[1], [2 3 4]; [5; 9], [6 7 8; 10 11 12]};

    87%! D = C; D(:,:,2) = C;

    88%! E = [1 2 3 4; 5 6 7 8; 9 10 11 12];

    89%! F = E; F(:,:,2) = E;

    90%!assert (cell2mat (C), E);

    91%!assert (cell2mat (D), F);

    92%!test

    93%! m = rand (10) + i * rand (10);

    94%! c = mat2cell (m, [1 2 3 4], [4 3 2 1]);

    95%! assert (cell2mat (c), m)

    96%!test

    97%! m = int8 (256*rand (4, 5, 6, 7, 8));

    98%! c = mat2cell (m, [1 2 1], [1 2 2], [3 1 1 1], [4 1 2], [3 1 4]);

    99%! assert (cell2mat (c), m)

   100## Demos

   101%!demo

   102%! C = {[1], [2 3 4]; [5; 9], [6 7 8; 10 11 12]};

   103%! cell2mat (C)