There are five nonzero elements in even columns and three nonzero elements in odd columns so that two positive definite symmetric matrixes A, B may be solved to accomplish the solution of finite element wave equation in x direction.

• 对于偶数行说来有5个非零元素,对于奇数行说来有3个非零元素,由此可求解A和B两个正定对称矩阵,从而完成x方向的有限元波动方程求解。