Matlab error limitin bounds - matlab

Question

I get the following error when I try to run this code "Attempted to access id(90); index out of bounds because numel(id)=89.Error in Untitled66 (line 26) person = find(id(fileNum)==ids);" Can someone help me spot the error?
% File Names reading and label generation
dataFolder= 'allcontent/';
fileNames = dir([dataFolder 'c*.*']);
lbl = sscanf(cat(1,fileNames.name)','co2%c%d.rd_%d.mat');
status = lbl(1:3:end);
id = lbl(2:3:end);
ids = unique(id);
trial = lbl(3:3:end);
%% File reading and Data Generation
%data = 256*channel*trial*stimulus*id
trData = zeros(256,64,10,3,20,'single');
label = zeros(10,3,20,'single');
trials = ones(3,20);
for fileNum = 1:numel(fileNames)
fin = fopen([dataFolder fileNames(fileNum).name]);
for i=1:4
line= fgetl(fin);
end
a= sscanf(line,'%S%d %s , trial %d');
stimulus = (3-numel(a));
person = find(id(fileNum)==ids);
trialNum = trials(stimulus, person);
label (trialNum, stimulus, person) = status(fileNum);
fprintf('%d %d %d\n', person,trialNum, stimulus);
for ch=1: 64
fgetl(fin);
curData = textscan(fin,'%d %s %d %f');
trData(:,ch,trialNum,stimulus,person) = curData{4};
end

Answer 1

for fileNum = 1:numel(fileNames) iterates over all files, but you don't have an id for each file: id = lbl(2:3:end);.
It seems to me that you want to iterate only over 1/3 or the files?
for fileNum = 2:3:numel(fileNames)
It's hard to tell what you're trying to accomplish, though. Are files related in groups of 3? You're probably better off selecting files from their names before computing id and all the other support matrices.