如何使用gnuplot绘制文件包含许多列和列标题 [英] how to plot file contains many columns and column header using gnuplot

问题描述

我有一些这样的数据文件:

I have some data file like this:

Id a1 a2 a3
1  1  2  3 
2  2  3  4 
3  2  3  4 

但是我不知道确切的列数，但是我可以使用shell将其放入变量中.我想绘制数据文件，在一张图片中将第一列作为x轴，将其他列作为y轴，并将列标题作为line的标题.

But I don't know the exact number of column, but I can get it into variable with shell. And I want to plot the data file, the first column as the x-axis and the others as the y-axis in one picture and the column header as the title for line.like this:

如何在gnuplot中绘制?非常感谢

How to plot in gnuplot? Many thanks

推荐答案

请考虑以下示例

colhead.gp :

plot for [i=2:n+1] 'colhead.dat' u 1:i w lp title columnheader(i)

colhead.dat :

Id a1 a2 a3
1  1  2  3
2  2  3  4
3  2  3  4

要从外壳获取参数:

gnuplot -persist -e "n=4" colhead.gp

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