Search code examples
gnuplot

Gnuplot labels from two columns

I need to get 2 columns for a label

The code attached below will give labels from column 4. I would like to get labels from columns 4 and 1.

 plot 'datafile' using 1:(0.5 * $2):4 with labels font "arial,11" tc lt 2

Datafile:

1 4 5 6
2 5 6 9
Solution

  • Probably, you are looking for something like this: simply merge your (numeric) columns or stringcolumns (check help strcol) in a sprintf() expression. Check help sprintf and help format_specifiers.

    Script:

    ### plot labels from multiple columns
reset session

$Data <<EOD
 A   1   9   11
 B   2   8   22
 C   3   7   33
 D   4   6   44
 E   5   5   55
EOD

set offset 1,1,1,1
set key noautotitle

plot $Data u 2:3:(sprintf("%s-%d",strcol(1),column(4))) w labels point pt 7 lc "red" offset 0,1
### end of script

    Result:

    enter image description here