error is : Subscripted assignment dimension mismatch.

this is my code for extraction of feature from folder having three sub folders but i am giving error at line trainingFeatures(featureCount,:)= ..... error is : Subscripted assignment dimension mismatch.

trainingFeatures = zeros(size(training,2)*training(1).Count,1008);
featureCount = 1;
for i=1:size(training,2)
    for j = 1:training(i).Count
        trainingFeatures(featureCount,:)= extractHOGFeatures(read(training(i),j));
        trainingLabel{featureCount} = training(i).Description;    
        featureCount = featureCount + 1;
    end
    personIndex{i} = training(i).Description;
end

Answer 1

[Dima Lisin]

You may be getting this error because there may be different numbers of images in each imageSet. The easiest thing to do here is to make trainingFeatures a cell array.

Answer 2

[Image Analyst]

You say size(training,2) indicating training is a 2D array, but then you later say training(i).Description indicating it's a 1-D array of structures. Before the loop, what does it say if you do this:

class training
whos training
size(training)

[Ushna Asif]

I'm getting this outputs

>>class training

ans =

char

>> whos training

Name          Size      Bytes  Class       Attributes

training      1x3   9682  imageSet

>> size(training)

ans =

     1     3

[Image Analyst]

Sorry, I don't have the Computer Vision System Toolbox so I can't test anything with imageset variables. Perhaps Dima will answer.