$(2)$ Using conjugate gradient method to solve the following problem

$A=([-2,1,],[1,-2,1,],[,$ddots,ddots,ddots,$],[,1,-2,1],[,1,-2]),b=([-1],[0],[vdots],[0],[-1])$

The initial point is decided by yourself and the size of the

problem is set as

$200+$last two number of your student ID

and

$400+$ last two number of your student ID

My student ID is $723113010001$

Generate Matlab code for step by step calculation