c++ - Disk Structuring Element opencv vs Matlab -

I want to create a disk size structural element on OpenCv. I need my SE

  sel = strel ('disk', 5);   
 I want to use  
  cvstructuringElementEx (cols, rows, anchor_x, anchor_y, size, * value) to do this;   
 What should I do to get this and what is the value of  anchor_x  and  anchor_y  ? According to 
 
, you can try:  
  cv:   
 : Mat sel = cv :: getStructuringElement (MORPH_ELLIPSE, CV :: size (9));   
 This gave me the following structure element:  
  0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 1 0 0 0 0   
 When I was in MATLAB:  
  & gt; & Gt; Milan (Stale ('Disk', 5)) ans = 0 1 1 1 1 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 1 1 1 1 1 1 0 0   
 Not quite right, but close enough :)