If you run into problems with yt, there are a number of steps to follow to come to a solution. The first handful of options are things you can do on your own, but if those don’t yield results, we have provided a number of ways to connect with our community of users and developers to solve the problem together.
To summarize, here are the steps in order:
This may seem silly, but it’s effective. While yt is a robust code with lots of functionality, like all actively-developed codes sometimes there are bugs. Chances are good that your problems have a quick fix, either because someone encountered it before and fixed it, the documentation is out of date, or some other simple solution. Don’t give up! We want to help you succeed!
Sometimes the pace of development is pretty fast on yt, particularly in the development branch, so a fix to your problem may have already been developed by the time you encounter it. Many users’ problems can simply be corrected by updating to the latest version of the code and/or its dependencies. You can update yt’s source by running:
$ yt update
or you could update yt’s source as well as any software dependencies by running:
$ yt update --all
If for some reason the
update command fails with errors, or any attempt at
loading yt either from the command line or from within python also fails, it
may simply mean you need to rebuild the yt source (some of the c-code in yt
needs to be rebuilt after major changes). You can do this by navigating to
the root of the yt mercurial repository. If you installed with the all-in-one
installer script, this is the
yt-<machine>/src/yt-hg directory. Then
execute these commands:
$ python setup.py develop
Now try running yt again with:
$ yt --help
If you continue to see errors, you should try contacting us via IRC or email but you may have to reinstall yt (see Getting and Installing yt).
The documentation has a lot of the answers to everyday problems. This doesn’t mean you have to read all of the docs top-to-bottom, but you should at least run a search to see if relevant topics have been answered in the docs. Click on the search field to the right of this window and enter your text. Another good place to look for answers in the documentation is our Frequently Asked Questions page.
OK, so there was no obvious solution to your problem in the documentation. It is possible that someone else experienced the problem before you did, and wrote to the mailing list about it. You can easily check the mailing list archive with the other search field to the right of this window (or you can use the search field below).
We’ve done our best to make the source clean, and it is easily searchable from your computer.
If you have not done so already (see Installing yt Using pip or from Source), clone a copy of the yt mercurial repository and make it the ‘active’ installation by doing
in the root directory of the yt mercurial repository.
This has already been done for you if you installed using the bash install script. Building yt from source will not work if you do not have a C compiler installed.
Once inside the yt mercurial repository, you can then search for the class,
function, or keyword which is giving you problems with
grep -r *, which will
recursively search throughout the code base. (For a much faster and cleaner
experience, we recommend
grin instead of
grep -r *. To install
with python, just type
pip install grin.)
So let’s say that
SlicePlot is giving you problems still, and you want to
look at the source to figure out what is going on.
$ cd $YT-HG/yt $ grep -r SlicePlot * (or $ grin SlicePlot)
This will print a number of locations in the yt source tree where
is mentioned. You can now followup on this and open up the files that have
SlicePlot (particularly the one that defines SlicePlot) and
inspect their contents for problems or clarification.
As you gear up to take your question to the rest of the community, try to distill your problem down to the fewest number of steps needed to produce it in a script. This can help you (and us) to identify the basic problem. Follow these steps:
$ yt pastebin script.py- pastes script.py online
$ yt upload_image image.png- pastes image online
$ yt version- provides version information, including changeset hash
It may be that through the mere process of doing this, you end up solving the problem!
If you want a fast, interactive experience, you could try jumping into our IRC channel to get your questions answered in a chatroom style environment. You don’t even need to have any special IRC client in order to join. We are the #yt channel on irc.freenode.net, but you can also connect using your web browser by going to http://yt-project.org/irc.html . There are usually 2-8 members of the user base and development team online, so you’ll probably get your answers quickly. Remember to bring the information from the last step.
If you still haven’t yet found a solution, feel free to write to the mailing list regarding your problems. There are two mailing lists, yt-users and yt-dev. The first should be used for asking for help, suggesting features and so on, and the latter has more chatter about the way the code is developed and discussions of changes and feature improvements.
If you email
yt-users asking for help, remember to include the information
about your problem you identified in this step.
When you email the list, providing this information can help the developers understand what you did, how it went wrong, and any potential fixes or similar problems they have seen in the past. Without this context, it can be very difficult to help out!
If you have gone through all of the above steps, and you’re still encountering
problems, then you have found a bug.
To submit a bug report, you can either directly create one through the
BitBucket web interface,
or you can use the command line
yt bugreport to interactively create one.
Alternatively, email the
yt-users mailing list and we will construct a new
ticket in your stead. Remember to include the information
about your problem you identified in this step.
If you are having installation issues and nothing from the
installation instructions seems to work, you should
definitely email the
yt-users email list. You should provide information
about the host, the version of the code you are using, and the output of
yt_install.log from your installation. We are very interested in making
sure that yt installs everywhere!
If you have customized yt in some way, or created your own plugins file (as described in Can I always load custom data objects, fields, and quantities with every dataset?) then it may be necessary to supply users willing to help you (or the mailing list) with both your patches to the source, the plugin file, and perhaps even the datafile on which you’re running.