参考各种文献以及实验条件，得到微晶片激光器的各物理参数，在matlab中编程求解该微晶片激光器对应的速率方程组。(Referring to various literatures and experimental conditions, we get the physical parameters of the microchip laser, and solve the rate equations of the microchip laser in MATLAB.)

功能为求解系数矩阵为三对角矩阵或者循环三对角矩阵的线性方程。 输入的四个参数均为行向量，分别对应系数矩阵的上副对角线，主对角线，下副对角线，以及方程等号另一侧的常数矩阵(The four parameters of the input are line vectors, which correspond to the upper diagonal lines of the coefficient matrix, the main diagonal line, the lower diagonal