For node number n , the series equations can be written as a linear equations, also can be express as a triangle array as following.
此线性方程组可用追赶法求解，也可用高斯法求解，还可以采用迭代法求解。
The results show that the lowest complete band gaps in the triangle array are wider than those in the square array at the same filling fraction.
研究结果表明：在相同的填充率下，钨柱按三角形排列比按正方形排列更容易具有较宽的完全带隙；
Creates an array of four points that describe a triangle.
建立描述三角形之四个点的阵列。
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