I want to create a dataset of my own like CIFAR-10 ?

I want to create a dataset of my own like CIFAR-10 but not with RGB values but CEDD feature vector of image. I am creating a imageDatastore and reading the images and thier labels with following code :

imageFolder = fullfile('G:\9th Semester\Project - 2\myDataset');
imds = imageDatastore(imageFolder,'LabelSource', 'foldernames', 'IncludeSubfolders',true);
[trainingSet , testingSet] = splitEachLabel(imds , 0.8 , 'randomize');
trainingSet = shuffle(trainingSet);
testingSet = shuffle(testingSet);
data = [];
labels = char.empty(0,10);
cedd = [];
for i=1:size(trainingSet.Files)
    image = readimage(trainingSet,i);
    cedd = CEDD(image);
    zerosCount = 0 ;
    for j=1:144
        if cedd(j) == 0
            zerosCount=zerosCount + 1;
        end
    end
    if zerosCount ~= 144
        data(i , :) = cedd;
        labels(i ,: ) = trainingSet.Labels(i);
    end
end
save('train.mat' , 'data' , 'labels');

But is giving me this error. Any help will be much appreciated !

Unable to perform assignment because the size of the left side is 1-by-10 and the size of the right side is 1-by-3.

Error in dataset (line 20)
        labels(i ,: ) = trainingSet.Labels(i);