PDD算法在大型机上的实现。由上海大学张武院长设计。三对角线性方程组的求解。-PDD algorithm implementation of the mainframe. Design by Shanghai University, Chang Wu Yuanzhang. Tridiagonal equations.

块迭代的阻尼雅克比松弛方法，对大型稀疏的线性方程组非常有效。-Block iterative relaxation method than the resistance Ni Yake