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function resu = subsindex(df, base)
%# function resu = subsindex(df)
%# This function convert a dataframe to an index. Do not expect a
%# meaningfull result when mixing numeric and logical columns.
%% 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/>.
if nargin < 2,
base = 1.0;
else
base = base - 1.0;
end
%# extract all values at once
dummy = df_whole(df);
if isa(dummy, 'logical'),
resu = sort(find(dummy)-base);
%# resu = dummy - base;
else
resu = dummy - base;
end
end
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