I have to translate from Matlab to C this code:

% take off the pads
x = (1 + padSize) : (rows - pad8Size);
y = (1 + padSize) : (cols - padSize);
rpad=rpad(x,y);

1st and 2nd create 2 array, but I don t know how I have to delete it from rpad Mat object It can be something like(subtract every element)

for(int i=1+pad;i<=rows-pad;i++){
for(int j=1+pad;i<=cols-pad;j++){
subtract(rpad,x,rpad);
subtract(rpad,y,rpad);}}

Or something like(delete the external element)

int a=(rows-pad)-(1+pad);
int b=(cols-pad)-(1+pad);
rpad.create(img.rows - a,img.cols - b,original.type());
img.copyTo(rpad);