与C程序中的gnuplot进行交互如何输入要绘制的数组

问题描述

我正在尝试使用gnuplot在C应用程序中嵌入一个“实时”绘图，但是遇到了一些我想更改的东西。

我正在使用gnuplot_i与gnuplot“接口”，就像在终端中使用gnuplot一样。每当我绘制（两行）时，我都会将数据保存到文件中，然后告诉gnuplot加载文件并绘制。

我不想保存数据文件并将数据直接加载到gnuplot中。我对gnuplot不太了解，所以可能有一个简单的解决方案可以解决我想要的问题。我想要的是这样的命令：

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

是否可以在gnuplot中执行此操作？

解决方法

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.

c gnuplot