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set key autotitle causes each plot to be identified in the key by the name
of the data file or function used in the plot command. This is the default.
set key noautotitle disables the automatic generation of plot titles.
The command set key autotitle columnheader causes the first entry in each
column of input data to be interpreted as a text string and used as a title for
the corresponding plot. If the quantity being plotted is a function of data
from several columns, gnuplot may be confused as to which column to draw the
title from. In this case it is necessary to specify the column explicitly in
the plot command, e.g.
plot "datafile" using (($2+$3)/$4) title columnhead(3) with lines
Note: The effect of set key autotitle columnheader, treatment of the first
line in a data file as column headers rather than data applies even if the
key is disabled by unset key. It also applies to stats and fit commands
even though they generate no key.
In all cases an explicit title or notitle keyword in the plot command
itself will override the default from set key autotitle.
Next: Key placement
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2017-05-27