A quasi-direct solution (QDS) for the finite difference equations has been developed, which is basel on the sparse and pivot-dominant properties of the matrix and is the combination of the direct method and the iterative method.

• 本文根据电磁位差分方程组系数矩阵对角元素占优以及稀疏性的特点,将直接求解一维线性方程组的追赶法与迭代法相结合,发展了一种准直接法。