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


version 3.623


 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'

 $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 3d plot)

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

  • 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.

  • 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_terminal

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


 $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) 2018 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.