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function resu = fold(df, dim, indr, indc)
%# function resu = fold(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) 2009-2017 Pascal Dupuis <cdemills@gmail.com>
%%
%% This file is part of the dataframe package for Octave.
%%
%% This package 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, or (at your option) any later version.
%%
%% This package 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 package; see the file COPYING. If not,
%% see <http://www.gnu.org/licenses/>.
switch dim
case 1
[indr, nrow] = df_name2idx (df.x_name{1}, indr, df.x_cnt(1), 'row');
[indc, ncol] = df_name2idx (df.x_name{2}, indc, df.x_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.x_rep);
%# a test function to determine if the location is free
for indj = (1:df.x_cnt(2))
if (any (indj == indc))
continue;
end
switch (df.x_type{indj})
case { 'char' }
testfunc{indj} = @(x, indr, indc) ...
~isna (x{indr, indc});
otherwise
testfunc{indj} = @(x, indr, indc) ...
~isna (x(indr, indc));
end
end
for indi = (indr)
%# where does this line go ?
where = find (df.x_data{indc}(1:slice_size, 1) ...
== df.x_data{indc}(indi, 1));
if (~isempty (where))
%# transfering one line -- loop over columns
for indj = (1:df.x_cnt(2))
if (any (indj == indc))
continue;
end
if (testfunc{indj}(resu.x_data{indj}, where, targets(indj)))
%# add one more sheet
resu = df_pad(resu, 3, 1, indj);
targets(indj) = targets(indj) + 1;
end
%# transfer field
stop
resu.x_data{indj}(where, targets(indj)) = ...
df.x_data{indj}(indi, 1);
end
%# update row index
resu.x_ridx(where, max(targets)) = df.x_ridx(indi);
else
disp ('line 65: FIXME'); keyboard;
end
end
else
disp ('line 70: FIXME '); keyboard
end
end
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