Re: [R] Krylov subspace computations of matrix exponentials

From: peter dalgaard <>
Date: Thu, 14 Apr 2011 11:01:32 +0200

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:  Priv:

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