$0 = 0 $100 = 0 while($100 < H*W) $2 = ($100/W)+1 $3 = ($100%W)+1 $4 = A[$2,$3] $5 = B[$2,$3] $0 = $0 + (((A[$2, $3] - B[$2, $3]) * (A[$2, $3] - B[$2, $3]) + 9999) / 10000) * $100 $100=$100+1 end return(($100/W)+1,($100%W)+1)