In this paper, an algorithm of region dividing through vector analysis recognizes relations among the elements of 2-d engineering graphics is presented.
本文提出的区域划分法，结合矢量分析能够识别构成工程图形各元素之间的几何形状关系。
Furthermore, the 3-d boundary value problem in boundary layer region is decomposed to 2-d plane strain and torsion problems.
进一步在边界层区域将三维的边值问题分解成二维的平面应变和扭转问题。
Because inverse Z transform in the case of 2 D is much more complicated than that in 1 D, which appears in 2 D convergent region or two variates factorization or teriable computations, etc.
二维逆Z变换远比一维情形复杂，表现在二维收敛域、二元因式分解、庞大的计算量等方面。
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