系统辨识中假定确定了对象的线性状态方程式，要求其系数。对象是时慢变系统，这时需要跟踪它的系数。这个场合使用递推最小二乘法很合适。本程序提供了一个试验例子。读者可根据需要自己更改代码。-System identification assume that the object to determine the linear equation of state, asking them to factor. When an object is a slowly varying system, then the coefficients need to track it. This occasion is very appropriate use of recursive least squares method. This procedure provides a test case. Readers may need to change their code.