用边界元方法求解平面拉普拉斯方程时必须计算两个矩阵。
Two matrices have to be calculated when solving plane Laplace equation by the use of BEM.
文章最后给出了有关矩阵元的计算方法。
Finally the methods for calculating the relevant matrix elements are provided.
空间协同分析时，采用超元法（每个单元由多根杆组成）计算等效柱的侧移刚度矩阵，自由度成倍减少。
The method is applied to calculate lateral stiffness matrix in space cooperating analysis and the the degree of freedom can be greatly decreased.
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