线性方程组求解算法实现。包括了列主元消元法、直接LU分解法、雅克比迭代、高斯赛德尔迭代法。并且对四个算法实现做了不太规范的、简单的类封装。原创代码，含详细注释。希望对用到数值计算的带来帮助。-Algorithm for solving linear equations. Including the main-element elimination method, the direct LU decomposition, Jacobi iteration, high Sisaideer itera