MATLAB: Matrix indexing within a loop

Question

Hi there, I have a script which loads epoched eog data (one after another) and identifies the bad trials (horizontal amplitudes above 95mV or bellow -95 mV). What I am just trying to add there, is a code which will be continuosly write into 8*25matrix (8 experimental conditions and 25 trials for each), which trials are good and which are bad, so if it finds eg. in the 9th trial of the first experimental condition bad trial it will write "1", and if not "0". Hope it is clear enough and thank you for your help!

 for k = 1:8
     % Create a mat filename, and load it into a structure called matData.
        matFileName = sprintf('event_%d_chans35-38.mat', k);
  if exist(matFileName, 'file')
    matData = load(matFileName);
      else
    fprintf('File %s does not exist.\n', matFileName);
        end
 xf=diff(matData.dataArray(3:4,:,:),1);
 xf=squeeze(xf);
 EOG_threshold_min = -95; 
 EOG_threshold_max = 95; 
    % Identify trials behind the threshold
    max_hor_amplitudes = max(xf);   %get max amplitude for each individual trial
    min_hor_amplitudes = min(xf);   %get min amplitude for each individual trial
    bad_max = max_hor_amplitudes > EOG_threshold_max;
    bad_min = min_hor_amplitudes < EOG_threshold_min;
    bad_trials_max = find(bad_max); 
    bad_trials_min = find(bad_min); 
end

Answer 1

Change

    bad_trials_max = find(bad_max); 
    bad_trials_min = find(bad_min);

to

    bad_trials_max(k, :) = bad_max;
    bad_trials_min(k, :) = bad_min;