how to encode the extracted feature? like in bagof feature

hi I extracted the Hog features from multiple images and I have saved all the extracted features in a cell type then, I want to encode the data with my training set but I could not encode it EX: bag1=bagOfFeatures(trainingSet,'CustomExtractor',@exampleBagOfFeaturesColorExtractor,'VocabularySize',250); scenedata1 = double(encode(bag1,trainingSet));

I want to do the same thing for Hog features ? C is my training set [featureVector,hogVisualization] = extractHOGFeatures(C,'CellSize',[2 2]); Vector{k,i}=featureVector; EX(Does not work because Vector is a cell type): Scenedata1 = double(encode(Vector,trainingSet));