Gnuplot is very rich in command options using the set operator.
gnuplot有许多命令选项，可以通过set操作符使用它们。
UNION ALL is the only set operator allowed between the last anchor member and first recursive member, and when combining multiple recursive members.
在最后一个定位点成员和第一个递归成员之间，以及组合多个递归成员时，只能使用UNIONALL集合运算符。
To compare with traditional medial filter and Gaussian filter, the image denoising method based on set operator has the characteristics of shape preserving and contrast invariant.
该图象去噪方法同传统的中值滤波、高斯滤波相比，具有保形、保对比度的特点。
This paper defines the concept of derived set operator, introduces the concept of fuzzy derived set operator in EX, studies their properties and discusses their relations to topology.
文中给出了导集算子的概念，并在EX上引入了模糊导集算子的概念，研究了其性质，讨论了它们与拓扑间的关系。
This paper defines the concept of derived set operator, introduces the concept of fuzzy derived set operator in EX, studies their properties and discusses their relations to topology.
文中给出了导集算子的概念，并在EX上引入了模糊导集算子的概念，研究了其性质，讨论了它们与拓扑间的关系。
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