Matrix indexing within a loop

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Rene Sebena
Rene Sebena 2016-11-20
评论： Walter Roberson 2016-11-20
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

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采纳的回答

Walter Roberson
Walter Roberson 2016-11-20
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;
  2 个评论
Rene Sebena
Rene Sebena 2016-11-20
Thanks for answer, but it is not quite what I need, this will rewrite in each step within the loop the previous condition,..so at the end I just see the results from the last condition. I need output which will look like this:
Wrong = (8,25);
0 0 0 0 0 1 0 etc.....1st loop step = 1st condition
0 0 0 0 0 0 1 etc.....2nd loop step = 2nd condition
etc...
Walter Roberson
Walter Roberson 2016-11-20
The indexing by k ensures that it updates the output matrix, not rewrites all of it.

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