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Editorial Team
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Asked: 2026-06-16T19:50:53+00:00

For a very large data-set, how can gnuplot be used to only put tic

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For a very large data-set, how can gnuplot be used to only put tic marks/labels on the x axis for just the first and last data point?

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1 Answer

  1. Editorial Team

    With gnuplot 4.6 and up, you can use the commands

    stats 'data.dat'
set xtics \
 (sprintf("%.2g",STATS_min_x) STATS_min_x, \
  sprintf("%.2g",STATS_max_x) STATS_max_x)
plot 'data.dat'

    With other versions of gnuplot, you can use this similar sequence of commands:

    # this setting makes sure we don't make an output right away
set terminal unknown
plot 'data.dat'
set xtics \
 (sprintf("%.2g",GPVAL_DATA_X_MIN) GPVAL_DATA_X_MIN, \
  sprintf("%.2g",GPVAL_DATA_X_MAX) GPVAL_DATA_X_MAX)
set terminal <actual terminal>
replot

    The set xtics command takes comma-separated pairs of strings with data values, all inside parentheses.

    (Here I assume you want the minimum and maximum, not the first and last, data points.)

    For more info you can run these at the gnuplot command line:

    help set format

    help set stats

    show variables all

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