[591ef1]: inst / @dataframe / private / df_mapper2.m Maximize Restore History

Download this file

df_mapper2.m    78 lines (70 with data), 2.6 kB

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
function resu = df_mapper2(func, df, varargin)
%# resu = df_mapper2(func, df)
%# small interface to iterate some vector func over the elements of a
%# dataframe. This one is specifically adapted to all functions where
%# the first argument, if numeric, is 'dim'.
%% 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.
%#
%# $Id$
%#
dim = 1; resu = []; vout = varargin;
%# take care of constructs as min(x, [], dim)
if (~isempty(varargin))
indk = 1; while (indk <= length (varargin))
if (isnumeric (varargin{indk}))
if (isempty (varargin{indk}))
indk = indk + 1; continue;
endif
dim = varargin{indk};
%# the "third" dim is the second on stored data
if (3 == dim) vout(indk) = 2; endif
endif
break;
endwhile
endif
switch (dim)
case {1}
resu = df_colmeta (df);
for indi = (1:df._cnt(2))
resu._data{indi} = feval (func, df._data{indi}(:, df._rep{indi}), ...
vout{:});
resu._rep{indi} = 1:size (resu._data{indi}, 2);
endfor
resu._cnt(1) = max (cellfun ('size', resu._data, 1));
if (resu._cnt(1) == df._cnt(1))
%# the func was not contracting
resu._ridx = df._ridx;
resu._name{1} = resu._name{1}; resu._over{1} = resu._over{1};
endif
case {2}
error ('Operation not implemented');
case {3}
resu = df_allmeta(df);
for indi = (1:df._cnt(2))
resu._data{indi} = feval (func, df._data{indi}(:, df._rep{indi}), ...
vout{:});
resu._rep{indi} = 1:size (resu._data{indi}, 2);
endfor
otherwise
error ("Invalid dimension %d", dim);
endswitch
resu = df_thirddim (resu);
endfunction