Lab::Moose::DataFile::Gnuplot - Text based data file ('Gnuplot style')


version 3.690


 use Lab::Moose;

 my $folder = datafolder();

 # datafile with two simple 2D plots:

 my $file = datafile(
     type => 'Gnuplot',
     folder => $folder,
     filename => 'gnuplot-file.dat',
     columns => [qw/time voltage temp/]

  # add live plot
     x => 'time',
     y => 'voltage',
     curve_options => {with => 'points'},
      x => 'time',
      y => 'temp',
      hard_copy => 'gnuplot-file-time-temp.png'

 # or both curves in one plot
     curves => [
         {x => 'time', y => 'voltage'},
         {x => 'time', y => 'temp', curve_options => {axes => 'x1y2'}}

 $file->log(time => 1, voltage => 2, temp => 3);

 # datafile with pm3d plot
 my $datafile = datafile(
     type => 'Gnuplot',
     folder => datafolder(),
     filename => 'data.dat',
     columns => [qw/x y z/],

     type => 'pm3d',
     x => 'x',
     y => 'y',
     z => 'z',
     hard_copy => 'data.png',
 for my $x (0..100) {
     for my $y (0..100) {
         $datafile->log(x => $x, y => $y, z => rand());



Supports the following attributtes in addition to the Lab::Moose::DataFile requirements:

  • columns

    (mandatory) arrayref of column names

  • precision

    The numbers are formatted with a %.${precision}g format specifier. Default is 10.


 $file->log(column1 => $value1, column2 => $value2, ...);

Log one line of data.


     prefix => {column1 => $value1, ...},
     block => $block,
     add_newline => 1

Log a 1D or 2D PDL or array ref. The first dimension runs over the datafile rows. You can add prefix columns, which will be the same for each line in the block. E.g. when using a spectrum analyzer inside a voltage sweep, one would log the returned PDL prefixed with the sweep voltage.



print "\n" to the datafile.


 $file->log_comment(comment => $string);

log a comment string, which will be prefixed with '#'. If $string contains newline characters, several lines of comments will be written.


     type => 'pm3d',
     x => 'x-column',
     y => 'y-column',
     z => 'z-column',
     plot_options => {grid => 1},
     hard_copy => 'myplot.png',
     hard_copy_terminal => 'svg',

Add a new live plot to the datafile. Options:

  • type

    Supported types: points (default), pm3d.

  • x (mandatory)

    Name of the column which is used for the x-axis.

  • y (mandatory)

    Name of the column which is used for the y-axis.

  • z (mandatory for 'pm3d' plot type)

    Name of the column which is used tor the cb-axis in a pm3d plot.

  • legend (only for '2d' plot type)

    For datafiles with multiple blocks, name of the column which is used to label the curves (See example in Lab::Measurement::Tutorial).

  • terminal

    gnuplot terminal. Default is qt.

  • terminal_options

    HashRef of terminal options. For the qt and x11 terminals, this defaults to {persist => 1, raise => 0}.

  • plot_options

    HashRef of plotting options (See PDL::Graphics::Gnuplot for the complete list). Those are appended to the default plot options.

  • curve_options

    HashRef of curve options (See PDL::Graphics::Gnuplot for the complete list).

  • refresh

    Set this to a string, if you need to refresh the plot manually with the refresh_plots option. Multiple plots can share the same refresh handle string.

    Predefined refresh types:

    • 'point'

      Default for 2D plots. Replot for each new row.

    • 'block'

      Default for 3D plots. Replot when finishing a block.

  • refresh_interval

    Minimum time between replots. Default: replot as often as refresh attribute allows.

  • hard_copy

    Filename for the copy of the plot in the data folder. Default: Switch datafile filename suffix of datafile to the $terminal, e.g. data.dat => data.png. Mandatory if you add multiple plots to one datafile.

  • hard_copy_suffix

    Filename suffix for the copy of the plot in the data folder. The filename off the copy will be basename off the datafile with this suffix added.

  • hard_copy_terminal

    Terminal for hard_copy option. Use png terminal by default. The 'output' terminal option must be supported.

  • live

    Set to false to only create the hardcopy and no live plot.

         live => 0,


 $file->refresh_plots(refresh => $refresh_type);
 # or

Call refresh_plot for each plot with hanle $handle.

If the handle argument is not given, refresh all plots.


This software is copyright (c) 2019 by the Lab::Measurement team; in detail:

  Copyright 2016       Simon Reinhardt
            2017       Andreas K. Huettel, Simon Reinhardt
            2018       Simon Reinhardt

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.