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

E.g. to plot the third line of the datafile:

plot "DATAFILE" u 3

or with awk:

plot "

Note that awk adds linenumbers, so the first column is linenumber.

does the same, gnuplot is automatically using the line-number for the x-axis