Jelmer Ypma <uctpjyy@ucl.ac.uk>, with contributions by
        Hans W. Borchers <hwborchers@googlemail.com> and 
        Dirk Eddelbuettel <edd@debian.org>
nloptr is an R interface to NLopt. NLopt is a free/open-source library for
    nonlinear optimization, providing a common interface for a number of
    different free optimization routines available online as well as original
    implementations of various other algorithms.
    See http://ab-initio.mit.edu/wiki/index.php/NLopt_Introduction for more
    information on the available algorithms. During installation on Unix the
    NLopt code is downloaded and compiled from the NLopt website.