将四象限和八象限推广到任意维数是正交的。
The generalization of the quadrant and octant to arbitrary number of dimensions is the orthant.
但用G P算法求关联维数存在抗干扰能力较差、可靠性不稳定、运算量巨大等缺点。先对相空间进行奇异谱分析，进而对原始相空间进行旋转，使其成为正交的等效空间，然后再使用G P算法。
But G-P algorithm which be used to calculate D2 have some shortages, such as being robust against noise, not stable, and needing a big operation.
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