Every

The every keyword allows a periodic sampling of a data set to be plotted.

Syntax:

      plot 'file' every a{:b{:c{:d}}}

This selects every a-th point in every b'th (iso)line, starting at point c in line d. To plot a single line from a 3-d datafile, one trick is to set d to the required line, and set b very large, so that no subsequent lines will be selected. If every is not specified, all points are plotted.

Following C indexing, the first point (and the first isoline) are assigned the index 0.