Astronomy 5160 Links

"svn up" always and often! If something doesn't look the way you think it should since a previous commit, then "svn up"
When you submit a homework task, "svn ls" to check that the directory myself (or other people) will see when they "svn up" corresponds to your local directory, or at least corresponds to how you want that directory to look to others. If a file in your local directory doesn't appear when you "svn ls", then you haven't added and/or committed it
If you return an error when you "svn ci" you may have forgot to supply "-m" and a log message. Or, you may have forgotten to "svn add" the file
If you feel that you absolutely have to delete something from svn, note that it won't vanish from the directory displayed by "svn ls" until your next commit (e.g., "svn ci file -m 'deleting a file'")
If svn hangs when making a commit or tells you that a directory is locked or doesn't exist, then you probably failed to add and commit the directory. Move up one directory ("cd ..") and test if the directory you were previously in exists in svn by issuing an "svn up" and an "svn ls"

If you can't find an object in a data file, or an object you can find seems strange (has the wrong flags set, or is too faint, or is listed as extended in imaging when you expect it to be a point-source) then check the coordinates of the object in the SDSS Navigator Tool...
...and if you're trying to find such an object in the sweeps use the SDSS Navigator Tool that corresponds to that version of the sweeps (i.e. if you're using the DR8 sweeps, then check against the DR8 Navigator Tool; if you're using the DR9 sweeps, then check against the DR9 Navigator Tool)