The Gnu Data Language is an interactive interpreter/incremental compiler for the GNU Data Language, which is primarily used in scientific, astronomical, medical and geo-science data processing applications. It supports graphical output and is intentionally designed to be highly compatible with the commercial IDL language. GDL is a free IDL (Interactive Data Language) compatible incremental compiler (ie. runs IDL programs). For a list of functions / compatability try this list.
To install on Ubuntu search the ‘Ubuntu Software Center’ or ‘Synaptic Package Manager’ or from the command line:
sudo apt-get install gnudatalanguage
File Locations (Ubuntu 10.10)
On installation, GDL is installed with various libraries in .pro files under:
Environment Variables / GDL_STARTUP
To ensure the libraries above are available to GDL when you run it, you can make use of the GDL_STARTUP environment variable. Set it as follows (bash):
Or add that line to the bottom of your .bashrc file so it is run automatically on log in. To do this graphically open a text editor Applications > Accessories> Text Editor. Choose File > Open and show hidden files by pressing Crtl-H on the keyboard. Open the .bash_rc file and add your export line at the bottom.
Now that we have set the GDL_STARTUP variable to point to a file we need to create that file: Use vi, Text Editor (gedit) or any other text editor to create the file: /home/jonny/.gdl_startup
and add the following contents:
!PATH=!PATH + ':/usr/share/doc/gnudatalanguage/examples/pro/' !PATH=!PATH + ':/usr/share/doc/gnudatalanguage/examples/pro/dicom/' !DIR='/home/jonny/gdl' print, '%** Personal settings are loaded and active **';
This sets the working directory to /home/jonny/gdl, we need to make sure that that exists. We can then reference files for input and output relative to this directory.