gnuplot可以以批处理模式进行操作，提供了一个命令脚本来生成一个图形，也是以非交互式模式来运行的，这让我们可以尝试一下它的特性来了解它们绘图的效果。

Gnuplot can operate in batch mode, providing a script of commands to generate a plot, and also in interactive mode, which allows you to try out its features to see the effect they have on your plot.

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