You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: read_eep_trial.m
    path of file: ./repos/spm12/external/eeprobe
    
    the code of the file until where you have to start completion: function [eeg,t] = read_eep_trial(filename, triggernumber, interval);
%
% READ_EEP_TRIAL reads a data from an EEProbe *.cnt file
%
% [eeg,t] = read_eep_trial(filename, triggernumber, interval);
%
% interval = [ -2, 5] reads a window of -2 to 5 seconds around
% the given trigger number
%
% Script returns eeg data structure: it contains the data, labels etc
% for the given interval
%
% t is the time in milliseconds of the trial (at the trigger, i.e., stimulus-time)
%
% Author: Michiel van Burik, ANT Software, Enschede, The Netherlands, 8 October 2003
%
% See also READ_EEP_TRG, READ_EEP_REJ, READ_EEP_AVR
%


    
function [eeg,t] = read_eep_trial(filename, triggernumber, interval);
%
% READ_EEP_TRIAL reads a data from an EEProbe *.cnt file
%
% [eeg,t] = read_eep_trial(filename, triggernumber, interval);
%
% interval = [ -2, 5] reads a window of -2 to 5 seconds around
% the given trigger number
%
% Script returns eeg data structure: it contains the data, labels etc
% for the given interval
%
% t is the time in milliseconds of the trial (at the trigger, i.e., stimulus-time)
%
% Author: Michiel van Burik, ANT Software, Enschede, The Netherlands, 8 October 2003
%
% See also READ_EEP_TRG, READ_EEP_REJ, READ_EEP_AVR
%

% Copyright (C) Michiel van Burik, ANT Software BV
%
% 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

% $Log: not supported by cvs2svn $
% Revision 1.1  2004/11/26 13:17:02  jwiskerke
% Added m-files without binary code in maple distribution.
%
% Revision 1.3  2003/10/24 13:38:50  Maarten-Jan Hoeve
% Added GNU Licence and updated revision history
%
% Revision 1.1.2  2003/10/17 09:55:20  mvelde
% updated: consistent copyrights, arguments/data labels, fixed some typos
%
% ANT Software BV, The Netherlands, www.ant-neuro.com / info@ant-neuro.com
%

% read short piece of data to get sampling rate, channels etc
eeg = read_eep_cnt([filename '.cnt'],100,101);
samplerate = eeg.rate;
eeglabels = eeg.label;

% read trigger information from external trigger file
trg = read_eep_trg([filename '.trg']);
if triggernumber > length(trg)
	error('Invalid trigger number, trigger does not exist!'); return
else
   trg = trg(triggernumber);
end