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diff --git a/octave_packages/dataframe-0.9.1/@dataframe/fold.m b/octave_packages/dataframe-0.9.1/@dataframe/fold.m
new file mode 100644
index 0000000..ed485c9
--- /dev/null
+++ b/octave_packages/dataframe-0.9.1/@dataframe/fold.m
@@ -0,0 +1,96 @@
+function resu = fold(df, dim, indr, indc)
+
+  %# function resu = subasgn(df, S, RHS)
+  %# The purpose is to fold a dataframe. Part from (1:indr-1) doesn't
+  %# move, then content starting at indr is moved into the second,
+  %# third, ... sheet. To be moved, there must be equality of rownames,
+  %# if any, and of fields contained in indc.
+
+
+  %% Copyright (C) 2009-2012 Pascal Dupuis <Pascal.Dupuis@uclouvain.be>
+  %%
+  %% 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 2, 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,
+  %% write to the Free Software Foundation, 51 Franklin Street -
+  %% Fifth Floor, Boston, MA 02110-1301, USA.
+  
+  %#
+  %# $Id: fold.m 9585 2012-02-05 15:32:46Z cdemills $
+  %#
+switch dim
+  case 1
+    [indr, nrow] = df_name2idx(df._name{1}, indr, df._cnt(1), 'row');
+    [indc, ncol] = df_name2idx(df._name{2}, indc, df._cnt(2), 'column');
+    
+    if (indr(1) > 1),
+      slice_size = indr(1) - 1;
+      %# we can't use directly resu = df(1:slice_size, :, :)
+      S.type = '()';
+      S.subs = { 1:slice_size, ':', ':', 'dataframe'};
+      resu = subsref(df, S);
+      
+      %# how many columns for each slice
+      targets = cellfun(@length, df._rep);
+      %# a test function to determine if the location is free
+      for indj = 1:df._cnt(2),
+	if (any(indj == indc)),
+	  continue;
+	endif
+	switch df._type{indj}
+	  case { 'char' }
+	    testfunc{indj} = @(x, indr, indc) ...
+		!isna(x{indr, indc});
+	  otherwise
+	    testfunc{indj} = @(x, indr, indc) ...
+		!isna(x(indr, indc));
+	endswitch
+      endfor
+
+      for indi = indr,
+	%# where does this line go ?
+	where = find(df._data{indc}(1:slice_size, 1) ...
+		     == df._data{indc}(indi, 1));
+	if (!isempty(where)),
+	  %# transfering one line -- loop over columns
+	  for indj = 1:df._cnt(2),
+	    if any(indj == indc),
+	      continue;
+	    endif
+	   
+	    if (testfunc{indj}(resu._data{indj}, where, targets(indj))),
+	      %# add one more sheet
+	      resu = df_pad(resu, 3, 1, indj);
+	      targets(indj) = targets(indj) + 1;
+	    endif
+	    %# transfer field
+	    stop
+	    resu._data{indj}(where, targets(indj)) = ...
+		df._data{indj}(indi, 1);
+	  endfor
+	  %# update row index
+	  resu._ridx(where, max(targets)) = df._ridx(indi);
+	else
+	  disp('line 65: FIXME'); keyboard;
+	endif
+      endfor
+
+    else
+
+      disp('line 70: FIXME '); keyboard
+    endif
+
+
+endswitch