[Gnuplot-info] X values from data set headers in boxplot

[Martin P. <ma...@po...>]

Hello,

I am trying to plot multiple sets of data with the boxplot style. All sets of 
data have their unique X axis value. In my small example, I have got it to 
work for X = 50, X = 55 and X = 60 in the same plot. However, I am not quite 
satisfied with the solution.

>From boxplot.g.txt, this is the part where the X values are determined:
   index i using (50 + (i * 5)):1

As you can see, the X value is calculated based on the index of the set in the 
data file. However, I would like to use the set's numeric header instead. I 
have tried to replace (50 + (i*5)) by (columnheader(i + 1)), but Gnuplot 
complains about "undefined function: columnheader." The columnheader(i + 1) 
call works perfectly fine just a few characters away in the same plot line, 
when it is used for setting the title.

How can I use the header of the data set as the X axis value?

Best regards,
Martin Pola