MATLAB: How to store the blobs centroid in array one by one in loop

Question

I have 6 blobs in my picture. I want to store the centroid of each blob in one array. I tried so much time but i get error. Why the below code get error

I think i have to form array inside array? that is each address of the centroid pixel array is in one array

pixelval=zeros(length(STATS),1);
centroid = STATS(i).Centroid;  
pixelval(i) = centroid;

Answer 1

Instead of those three lines, try this single line

centroids = [STATS.Centroid];

centroids is an N by 2 array where the first column are the x's and the second column are the y's. Or:

xCentroids = centroids(:,1);
yCentroids = centroids(:,2);