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.
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