copydatafield.m.svn-base

a function inside machine learning

function d = copyDataField(d2, d, name, exIndices, colInds)
%Copy a data field from d2 to d called name. 
%Optionally specify exIndices and colInds

% Copyright (C) 2006 Charanpal Dhanjal 

% This library is free software; you can redistribute it and/or
% modify it under the terms of the GNU Lesser General Public
% License as published by the Free Software Foundation; either
% version 2.1 of the License, or (at your option) any later version.
% 
% This library 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
% Lesser General Public License for more details.
% 
% You should have received a copy of the GNU Lesser General Public
% License along with this library; if not, write to the Free Software
% Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301
% USA

if (nargin < 3)
    fprintf('%s\n', help(sprintf('%s', mfilename)));
    error('Incorrect number of inputs - see above usage instructions.');
end

if isfield(d.exampleIndices, name)
    error('Field %s already exists', name); 
end

d.globalIndices.(name) = d2.globalIndices.(name); 
d.types.(name) = d2.types.(name);

if nargin == 3 
    d.exampleIndices.(name) = d2.exampleIndices.(name);
    d.colIndices.(name) = d2.colIndices.(name);
elseif nargin == 4
    d.exampleIndices.(name) = d2.exampleIndices.(name)(exIndices);
    d.colIndices.(name) = d2.colIndices.(name);
else
    d.exampleIndices.(name) = d2.exampleIndices.(name)(exIndices);
    d.colIndices.(name) = d2.colIndices.(name)(colInds);
end

%Increment the reference counter 
global dataValuesRefCount; 
dataValuesRefCount(d.globalIndices.(name), 1) = dataValuesRefCount(d.globalIndices.(name), 1) + 1;

%Finally, set the number of examples if not initialised
if d.numExamples == 0 
    d.numExamples = size(d.exampleIndices.(name), 1);
end