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% memmapdata() - create a memory-mapped data class
%
% Usage:
% >> data_class = memmapdata(data);
%
% Inputs:
% data - input data or data file
%
% Outputs:
% data_class - output dataset class
%
% Author: Arnaud Delorme, SCCN, INC, UCSD, Nov. 2008
% Copyright (C) 2008 Arnaud Delorme, SCCN, INC, UCSD
%
% This program 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 of the License, or
% (at your option) any later version.
%
% This program 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 program; if not, write to the Free Software
% Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
function dataout = memmapdata(data, datadims);
dataout.fileformat = 'normal';
if isstr(data)
if length(data) > 3
if strcmpi('.dat', data(end-3:end))
dataout.fileformat = 'transposed';
end;
end;
% check that the file is not empty
% --------------------------------
a = dir(data);
if isempty(a)
error([ 'Data file ''' data '''not found' ]);
elseif a(1).bytes == 0
error([ 'Empty data file ''' data '''' ]);
end;
if ~strcmpi(dataout.fileformat, 'transposed')
dataout.data = memmapfile(data, 'writable', false, 'format', { 'single' datadims 'x' });
else
dataout.data = memmapfile(data, 'writable', false, 'format', { 'single' [ datadims(2:end) datadims(1) ] 'x' });
end;
dataout = class(dataout,'memmapdata');
else
dataout = data;
end;
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