事实上，经过坐标变换，我们可以在维数更低的子空间（甚至是在平面上）来研究信号。
So one can study the signal in some much lower-dimensional subspaces, specifically, some planes.
以分形理论为依据，在雷达坐标中对电力系统负荷序列的分形维数、膨胀系数等参数进行了计算。
In accordance with the methods of fractal theory the parameters of power load series, such as fractal dimension and dilatation coefficient, are calculated in radar coordination.
机械系统的欠驱动特性是指系统控制输入向量空间的维数小于系统广义坐标向量空间维数的情况。
The underactuation of mechanical systems means that the dimension of the control vectors of systems is less than that of the configuration vector of systems.
另一方面，发现可以通过选取合适的坐标系可有效地降低积分动量的维数，同样可以求得关联函数的解析式来。
On the other hand, it is found that choosing the appropriate coordinate system can effectively reduce the integration variable dimension and finally arrive at the same result.
一维空间的不可测集的构造方法基本相同，本文通过将二维空间里的点其对应坐标为有理数的划分方法来确定亲和集，进而给出了一个二维的不可测集。
We know the structure way of the one-dimension no-measurable set, in this paper we first define a amicable set using a mapping, then we give a two-dimension non-measurable set.
一维空间的不可测集的构造方法基本相同，本文通过将二维空间里的点其对应坐标为有理数的划分方法来确定亲和集，进而给出了一个二维的不可测集。
We know the structure way of the one-dimension no-measurable set, in this paper we first define a amicable set using a mapping, then we give a two-dimension non-measurable set.
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