这是用vc编的LU分解法，也叫杜利



特儿法，子过程LUDCMP将矩阵分解



为上三角和下三角矩阵，子过程LU



BKSB利用LUDCMP的分解结果得到线



性方程组的解-vc addendum to the LU decomposition method, also called Dulite abuse, LUDCMP sub-process decomposition of the matrix on the Triangle and lower triangular matrices. LU BKSB sub-process use LUDCMP results of the decomposition of linear equations solution