从 C 程序与 gnuplot 交互。如何输入数组进行绘图

Question

我正在尝试使用 gnuplot 制作一个嵌入到 C 应用程序中的 'live' 图，但我遇到了一些我想更改的内容。

我将 gnuplot_i 到 'interface' 与 gnuplot 一起使用，就像我在终端中使用 gnuplot 一样。每当我绘制（两行）时，我都会将数据保存到一个文件中，然后告诉 gnuplot 加载文件并绘制。

我希望不必保存数据文件并将数据直接加载到 gnuplot 中。我对 gnuplot 了解不多，所以可能有一个简单的解决方案来满足我的需求。我想要的是这样的命令：

plot [1,2,3,4], [1,1,1,1], [1,2,3,4], [2,2,2,2]
     |_____line 1_______|  |______line 2______|

有没有办法在 gnuplot 中做到这一点？

Answer 1

gnuplot> help datablock
 There are two mechanisms for embedding data into a stream of gnuplot commands.
 If the special filename '-' appears in a plot command, then the lines
 immediately following the plot command are interpreted as inline data.
 See `special-filenames`.  Data provided in this way can only be used once, by
 the plot command it follows.

 The second mechanism defines a named data block as a here-document.  The named
 data is persistent and may be referred to by more than one plot command.
 Example:
      $Mydata << EOD
      11 22 33 first line of data
      44 55 66 second line of data
      # comments work just as in a data file
      77 88 99
      EOD
      stats $Mydata using 1:3
      plot $Mydata using 1:3 with points, $Mydata using 1:2 with impulses

 Data block names must begin with a $ character, which distinguishes them from
 other types of persistent variables.  The end-of-data delimiter (EOD in the
 example) may be any sequence of alphanumeric characters.

从 C 程序与 gnuplot 交互。如何输入数组进行绘图

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