function[] = importData(varargin)
if (nargin == 0)
    if (isempty(obj.filename))
        error('Filename has not been set')
    end
else
    obj.filename = varargin{1};
end

[base filename ext] = fileparts(obj.filename);

if strcmp(lower(ext), '.edf');
    obj.readEDF;
end

if strcmp(lower(ext), '.asc');
    obj.readASC;
end
end