How to plot line with missing data points in gnuplot

Question

Example:

I want to plot a chart just like above one: a line with some missing data points, that means the line is discontinuous.

How can I do this?

Answer 1

This depends on what your datafile looks like. If you insert a blank space in your datafile, it won't connect those adjacent points (This is the easiest way):

consider:

 #datafile
 1 2
 2 3

 4 2
 5 3

and then the script to plot it:

 plot 'datafile' u 1:2 w linespoints

There are other tricks you can play with missing data: set datafile missing. A good reference for this is the builtin help (help missing).