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function [df, S] = df_cow(df, S, col)
%# function [resu, S] = df_cow(df, S, col)
%# Implements Copy-On-Write on dataframe. If one or more columns
%# specified in inds is aliased to another one, duplicate it and
%# adjust the repetition index to remove the aliasing
%% 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 2, 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/>.
if (length (col) > 1)
error ('df_cow must work on a column-by-column basis');
end
if (1 == length (S.subs)),
inds = 1;
else
inds = S.subs{2};
end
if (~isnumeric(inds))
if (~strcmp (inds, ':'))
error ('Unknown sheet selector %s', inds);
end
inds = 1:length (df.x_rep(col));
end
for indi = (inds(:).')
dummy = df.x_rep{col}; dummy(indi) = 0;
df.x_rep{col}(indi);
[t1, t2] = ismember (ans(:), dummy);
for indj = (t2(find (t2))) %# Copy-On-Write
%# determines the index for the next column
t1 = 1 + max (df.x_rep{col});
%# duplicate the touched column
df.x_data{col} = horzcat (df.x_data{col}, ...
df.x_data{col}(:, df.x_rep{col}(indj)));
if (indi > 1)
%# a new column has been created
df.x_rep{col}(indi) = t1;
else
%# update repetition index aliasing this one
df.x_rep{col}(find (dummy == indi)) = t1;
end
end
end
%# reorder S
if (length (S.subs) > 1)
if (S.subs{2} ~= 1 || length (S.subs{2}) > 1),
%# adapt sheet index according to df_rep
S.subs{2} = df.x_rep{col}(S.subs{2});
end
end
df = df_thirddim (df);
end
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