如何使用for循环将regionprops的结果存储为矩阵

for i=1:length(blocks)
    for j=1:length(blocks)
        temp = blocks{i,j};
        s = regionprops(temp, 'Centroid');
        centroids= cat(1,s.Centroid);  
    end
end
for i=1:length(blocks)
    for j=1:length(block