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?
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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:
and then the script to plot it:
There are other tricks you can play with missing data:
set datafile missing. A good reference for this is the builtin help (help missing).