NCL >Download >Windows notesThis document contains notes on installing and running NCL under theWindows 10 subsystem, also known as the Linux Bash shell.

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Please read these instructions all the way through before starting theinstallation.

Install or updated to Windows 10

In order to use the Linux Bash Shell, you must upgrade to Windows 10, and you must have a 64-bit system. See the next section for more details.

Enable and run the Linux Bash shell

Once you have Windows 10 installed, you need to enable the Linux Bashshell and then run it.

Wefound thisuseful article on howtogeek.com. Be sure to read through thesection on how to run the bash.exe file, as you will need to do thisbefore reading the next section.

Install additional packages

Before you can run NCL, you need to install some additional packagesthat NCL depends on. Using Linux makes this easy, because you can usethe 'apt-get' command to install the required packages.

From the Linux bash window that you opened earlier, type the following commandsto install the required packages. You can put multiple packages on one line:

Note that the firefox and imagemagick packages are not required, butuseful. Imagemagick gives you the powerful 'convert' command forconverting and post-processing graphical images.

The above installations can take awhile, so make sure to do this whenyou're not in a hurry.

Install and run Xming

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If you need to use the X11 window option in NCL Graphics, then youwill need to install and run an X server. If you are not sure, thenwe recommend following these instructions anyway.

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Wefound anarticle in PC World that recommends usingthe Xmingpackage as an X server. Be sure to read the instructions about settingthe DISPLAY environment variable before reading the next section.

Download NCL

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Now you are ready to download NCL:

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• Open a browser window from the Linux shell (using the above instructions from PC World).
• Go to the Climate Data Gateway web site.
• Navigate your way to the NCL Version6.6.0 OPeNDAPenabledor non OPeNDAP enabledpage.
• Download the binary for the 64-bit version of NCL compiled under Debian 7.11:

  or

  You can remove the ncl_ncarg-6.6.2-Debian7.11_64bit_gnu472.tar.gz file once the above commands are done.

  Set your environment to run NCL

  Every user of NCL needs to set their environment before they can useNCL. You can do this by opening the file '~/.profile' or'~/.bashrc' with a UNIX editor (vim, nedit, emacs, etc) andadding the lines:

  Please note that you must use a UNIX editor to change this file. Ifyou are unfamiliar with UNIX editors, we recommend that youuse nedit, which you caninstall via 'sudo apt-get install nedit'.

  Set DISPLAY environment variable

  In order to run any X applications, including running NCL to displaygraphics to your screen, you may need to set the DISPLAY enviromentvariable, as described in the earlierXming instructions. You can set this variable in thesame ~/.profile or ~/.bashrce that you used for settingNCARG_ROOT.

  You should now be ready to test NCL.

  Test NCL

  To test your installation of NCL, type the following:

  This should echo the version of NCL, like '6.6.2'.

  For a graphical test, type:

  A window with an XY plot should pop up. If you click anywhere in thewindow with your left mouse button, the window will go away.

  If you have problems, then please review the troubleshooting sectionthat follows.

  Troubleshooting problems

  If you are having problems running the test in the above section,then here are some troubleshooting tips:
  • If you get an error about 'ncl' not being able to find a missing'libxxxx.so' library, then try using the 'apt-get' command toinstall that library or package.
  • If you get the error:

    then this probably means that your DISPLAY environment variableis not set, or it is set incorrectly. Please type:

    and make sure that it is set to what is discussed in the 'Set DISPLAY environment variable' sectionabove.

  If you still have problems, then send email to ncl-install@ucar.edu. You need to be amember in order to post.

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