1.000 2.000 "Third column is all of this text" 4.00
Text fields can be positioned within a 2-D or 3-D plot using the commands:
plot 'datafile' using 1:2:4 with labels splot 'datafile' using 1:2:3:4 with labels
A column of text data can also be used to label the ticmarks along one or more of the plot axes. The example below plots a line through a series of points with (X,Y) coordinates taken from columns 3 and 4 of the input datafile. However, rather than generating regularly spaced tics along the x axis labeled numerically, gnuplot will position a tic mark along the x axis at the X coordinate of each point and label the tic mark with text taken from column 1 of the input datafile.
set xtics plot 'datafile' using 3:4:xticlabels(1) with linespoints
There is also an option that will interpret the first entry in a column of input data (i.e. the column heading) as a text field, and use it as the key title for data plotted from that column. The example given below will use the first entry in column 2 to generate a title in the key box, while processing the remainder of columns 2 and 4 to draw the required line:
plot 'datafile' using 1:(f($2)/$4) with lines title columnhead(2)
plot for [i=2:6] 'datafile' using i title "Results for ".columnhead(i)
Copyright 1986 - 1993, 1998, 2004 Thomas Williams, Colin Kelley
Distributed under the gnuplot license (rights to distribute modified versions are withheld).