Having “automatic” x

Question

Just a simple question (I imagine) but, lets say I have the following data file:

# no x data, it\'s sampled for instance each second.
23 42 48 
49 89 33
39 4         


        

Answer 1

Or more simply, you can also type: plot "file.dat" u ($0):3

This will allow you to modify the index variable linearly, as you would any other column

Such as scaling by 2 and adding 1: plot "file.dat" u (($0)*2+1):3