First, the data input file name is given, then we inform gnuplot what columns to plot.

首先，指定数据输入文件名，然后告诉gnuplot要绘制哪些列。

youdao

To specify an input file name, add the name to the command line as the input file.

若要指定一个输入文件名，请将该名称作为输入文件添加到命令行。

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XML::Simple generally has sensible defaults, so that for example if you specify no input file name, a Perl program named part1.pl (as in Listing 4) will read a file called part1.xml.

Simple 有一些合理的默认设置，例如如果没有指定输入文件名，那么 Perl 程序 part1.pl（清单 4）将读取文件 part1.xml。

youdao

Why is this much nice? Well, that's a handy piece of code. Because imagine I've got that now, and I can now store that away in some file name, input dot p y, and import into every one of my procedure functions, pardon me, my files of procedures, because it's a standard way of now giving me the input.

为什么这样很好呢？,这是一段很好用的代码,因为想象下如果我有了这段代码,我能把它用某个文件名保存起来,后缀是。py，导入到所有的处理函数中,抱歉，我的处理文件,因为这是一个标准的输入方法。

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