1 Limited-memory BFGS code by Ciyou Zhu, Richard Byrd, Peihuang Lu, and
2 Jorge Nocedal, which can be found (in various translations) at various
5 http://www.alglib.net/optimization/lbfgsb.php
6 http://plato.asu.edu/ftp/other_software/toms778_f90.tar.gz
7 http://www-fp.mcs.anl.gov/otc/Tools/LBFGS-B/
9 Unfortunately, since it was published in ACM TOMS, it seems to be
10 under the restrictive (semi-free) ACM copyright conditions. This was
11 confirmed in a private email from the author, Prof. Nocedal.
13 Therefore, we no longer use this code in NLopt.
15 Fortunately, Prof. Luksan's PLIN.FOR code (see the luksan/ directory)
16 is an independent implementation of the same algorithm, and is licensed