recursive least square

例句：

1. 1. The algorithm is designed to be recursive and easy to understand.
   这个算法被设计成递归的，易于理解。
2. 2. The data is recursive, meaning it can be broken down into smaller pieces.
   数据是递归的，意味着它可以被分解成更小的部分。
3. 3. The process of solving the problem is recursive, requiring a lot of trial and error.
   解决问题的过程是递归的，需要大量的试错。