对于在Linux下工作的人，如果你经常要画一些二维图和简单的三维图的话，那么，gnuplot无疑是一个非常好的选择，不仅图形漂亮，而且操作简单。-For people who work under Linux, if you often have to draw some simple two-dimensional drawings and three-dimensional map, then, gnuplot is undoubtedly a very good choice, not o

Pro/E是使用非常广泛的三维参数化建模软件，其中很多曲线是很难画出的，而用本程序的方程可以非常方便的画出。-Pro/E is to use a very wide range of three-dimensional parametric modeling software, which is very difficult to draw a lot of curves, and the use of this procedure can be very convenient equation