We have rectangular coordinates, we have cylindrical coordinates and we have spherical coordinates.
我们有直角坐标系，有柱坐标系和球坐标系。
Actually, that's the same with cylindrical coordinates.
事实上，柱坐标中也是如此。
The splot command is Cartesian by default but can also support spherical and cylindrical coordinates.
splot 命令默认使用的是笛卡儿坐标系，不过也可以支持球面或柱面坐标系。
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