# MATLAB: Can u please tell me that here ‘a’ is a array or matrix and what it means by max(max(aa))

surf feature detection

points = detectSURFFeatures(B);  axes(handles.axes1);  imshow(B); hold on;  plot(points.selectStrongest(10));  title('SURF feature result on input image','fontsize',15);pause(1);  a = points  aa = a.Scale  a1 = max(max(aa))  a2 = round(a1)