I noticed that the link http://lammps.sandia.gov/doc/compute_vacf.html
points to a non-existing document; the pdf version of the manual
(found at http://lammps.sandia.gov/doc/Manual.pdf) is also missing the
compute/vacf documentation. Is this because the documentation has not
been written yet?
In addition, it appears that the timestamp in the pdf file (first
page) is incorrect as the manual certainly contains several commands
that were added since 24 January 2013.