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: test_tutorial_coherence.m
    path of file: ./repos/fieldtrip/test
    
    the code of the file until where you have to start completion: function test_tutorial_coherence

% MEM 4gb
% WALLTIME 00:20:00
% DEPENDENCY ft_freqanalysis ft_connectivityanalysis ft_multiplotER ft_singleplotER ft_topoplotER ft_sourceanalysis ft_sourceinterpolate ft_prepare_sourcemodel headsurface
% DATA public

addpath(dccnpath('/home/common/matlab/fieldtrip/data/ftp/tutorial/coherence')); % this contains the trial function

% find the interesting epochs of data
cfg = []
    
function
function trl = trialfun_left(cfg)

% read in the triggers and create a trial-matrix
% consisting of 1-second data segments, in which
% left ECR-muscle is active.

event = ft_read_event(cfg.dataset);
trig  = [event(find(strcmp('backpanel trigger', {event.type}))).value];
indx  = [event(find(strcmp('backpanel trigger', {event.type}))).sample];

%left-condition
sel = [find(trig==1028):find(trig==1029)];

trig = trig(sel);
indx = indx(sel);
 
trl = [];
for j = 1:length(trig)-1
  trg1 = trig(j);
  trg2 = trig(j+1);
  if trg1<=100 && trg2==2080
    trlok      = [[indx(j)+1:1200:indx(j+1)-1200]' [indx(j)+1200:1200:indx(j+1)]'];
    trlok(:,3) = [0:-1200:-1200*(size(trlok,1)-1)]';
    trl        = [trl; trlok];
  end