This algorithm used the data of tree structure, and could more reasonably the skipping relations of the non-zero elements in the rows and lines of the sparse check matrix.
该算法采用人们熟悉的树型数据结构，可以较为合理地表示稀疏校验矩阵中行与列中非零元素的跳转关系。
Spurious zero energy modes are present in the stress element, but it is proved that non spurious zero energy mode is present in the global analysis of the whole structure.
分析了应力元的多余零能模式，并证明了整体分析中对多余零能模式的消弭；
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