Krylov subspace computations of matrix exponentials
On Apr 14, 2011, at 10:16 , Niels Richard Hansen wrote:
A third question. There exists a Fortran implementation called Expokit with an ad hoc license stating that "Permission to use, copy, modify, and distribute EXPOKIT and its supporting documentation for non-commercial purposes, is hereby granted without fee, provided that this permission message and copyright notice appear in all copies." If I choose to use Expokit and just write an interface to R, would there be any problems with having such a copyright notice in the package?
Probably. GPL and "non-commercial" are incompatible, so you can't distribute anything that mixes the two licenses. R itself has chosen to allow non-GPL packages, although there is a very fine line between a package as a "plug-in" vs. a "derived work".
Peter Dalgaard Center for Statistics, Copenhagen Business School Solbjerg Plads 3, 2000 Frederiksberg, Denmark Phone: (+45)38153501 Email: pd.mes at cbs.dk Priv: PDalgd at gmail.com