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df_mapper.m    38 lines (32 with data), 1.3 kB

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function resu = df_mapper(func, df, varargin)
%# resu = df_mapper(func, df)
%# small interface to iterate some func over the elements of a dataframe.
%% 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.
%#
%# $Id$
%#
resu = df_allmeta(df);
resu._data = cellfun(@(x) feval(func, x, varargin{:}), df._data, \
"UniformOutput", false);
resu._rep = df._rep; %# things didn't change
resu._type = cellfun(@(x) class(x(1)), resu._data, "UniformOutput", false);
resu = df_thirddim(resu);
endfunction