随着存储技术的发展，许多现代电脑都已经采用 SSD 固态硬盘作为主要存储设备。同时，为了扩展存储空间，也有不少用户和设备附加了性价比更高的大容量 HDD 机械硬盘。
I am working with a large list of points (each point has three dimensions x,y,z). I am pretty new with R, so I would like to know what is the best way to represent that kind of information.As far as
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