odepkg is part of the octave-forge project. It contains additional functions for numerically solving ordinary differential equations.
The most recent official release is version 0.8.5, which however is out of date (it includes functions which have been transferred to core Octave) and will not install at all with recent compilers and versions of Octave.
Until a new official release is made, users might consider installing a development snapshot of the package, as follows:
[fname, success] = urlwrite ("https://bitbucket.org/odepkg/odepkg/get/default.tar.gz", [P_tmpdir "odepkg.tar.gz"]); assert (success) pkg ("install", fname)
These directions are for users running the Octave stable release. For users running the development version of Octave, follow the same directions but replace