getdatafieldsize.m.svn-base

a function inside machine learning

function [numRows, numCols] = getDataFieldSize(d, name) 
%Get the size of a d field 

% 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 ~= 2)
    fprintf('%s\n', help(sprintf('%s', mfilename)));
    error('Incorrect number of inputs - see above usage instructions.');
end

if d.numExamples == 0 
    error('Using uninitialised data object'); 
end 

if isfield(d, 'exampleIndices') & ~isfield(d.exampleIndices, name)
    error('Field %s does not exist', name); 
end 

numCols = length(d.colIndices.(name));
numRows = length(d.exampleIndices.(name));