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Date: Sun, 10 Sep 2006 14:06:28 -0700
From: "Henri Yandell" <flamefew@gmail.com>
To: "Jakarta Commons Developers List" <commons-dev@jakarta.apache.org>
Subject: Re: [math] Mantissa inclusion and copyright issues
In-Reply-To: <45044711.9000807@free.fr>
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References: <45044711.9000807@free.fr>

It looks like the Minpack license is a BSD license with an extended
warranty and liability section. I'll ping the legal-discuss mailing
list about it, but it looks fine to me. Just some government
boilerplate tacked onto a BSD license I think.

The Hairer license is as you say, a BSD-like license, so that's fine.

For both cases, we don't need software grants. Instead we put the
information in the NOTICE.txt file. I presume the original files you
took the code from had copyright statements at the top?


Hen

On 9/10/06, Luc Maisonobe <Luc.Maisonobe@free.fr> wrote:
> Hello,
>
> As mentioned a few times on this list, I have proposed to donate the
> Mantissa (http://www.spaceroots.org/software/mantissa/index.html) code
> to Apache and continue maintaining it here along with commons math.
>
> Almost everything has been both designed and coded by me, so I was able
> to sign a Software Grant myself for everything except one class already
> identified since the beginning. However, after some checks, four
> additional Mantissa classes could induce some copyright issues and I am
> seeking for advices for these classes.
>
> org.spaceroots.mantissa.estimation.LevenbergMarquardtEstimator:
>
> This class is an implementation of the Levenberg-Marquardt algorithm.
> The internal code is a translation in Java of the 1980 fortran lmder,
> lmpar and qrsolv  routines (http://www.netlib.org/minpack/lmder.f,
> http://www.netlib.org/minpack/lmpar.f,
> http://www.netlib.org/minpack/qrsolv.f) which are distributed as part of
> minpack under the following license:
> http://www.netlib.org/minpack/disclaimer. The code I want to donate
> includes the following changes from minpack:
>
>    - complete translation of all code in Java
>    - complete redesign of the interface to fit
>      with the existing Mantissa Estimator interface
>    - complete rewrite of the Q.R decomposition part
>      to use another implementation derived from a textbook
>    - adaptation of the upper-level code (calling the Q.R
>      decomposition) to the lower-level implementation changes
>      (calls, indices and columns reordering handling)
>
> The implementation of the estimate (lmder), determineLMParameter (lmpar)
> and determineLMDirection (qrsolv) are the parts that come from Minpack,
> their origin are advertised (as required by Minpack license) and only
> the translation in Java and the adaptation are new. All the rest of the
> class (interface, all other methods including qrDecomposition) is
> original work.
>
>  From a users perspective, it is a very important algorithm and a clear
> improvement for commons math. It also seems that most (if not all)
> implementations of the algorithm are indeed translations of these
> minpack routines. It seems difficult to ask for the original authors to
> provide a software grant to Apache. Is this class acceptable in commons
> math or should it be dropped (it would be difficult to reimplement the
> three methods directly translated from minpack) ?
>
> org.spaceroots.mantissa.ode.GraggBulirschStoerIntegrator and
> org.spaceroots.mantissa.ode.GraggBulirschStoerInterpolator
>
> These classes are an implementation of the Gragg-Bulirsch-Stoer
> integrator. The internal code is a translation in Java of the fortran
> odex code by E. Hairer and G. Wanner
> (http://www.unige.ch/math/folks/hairer/prog/nonstiff/odex.f) distributed
> under the following license (BSD type):
> http://www.unige.ch/~hairer/prog/licence.txt
>
> The algorithm is described in the well known Hairer, Norsett and Wanner
> textbook Solving Differential Equations (part I, nonstiff problems).
>
> The code I want to donate includes the following changes from odex:
>
>    - complete translation of all code in Java
>    - complete redesign of the interface to fit
>      with the existing Mantissa FirstOrderIntegrator interface
>
>  From a users perspective, this integrator could be omitted. It is one
> of the best integrators available for nonstiff problems, of course, but
> Mantissa also includes the Dormand-Prince 8(5,3) which is another very
> good integrator, and which was implemented from scratch and shares the
> design of other Runge-Kutta-Fehlberg integrators. Should these two
> classes be included in commons math ?
>
> org.spaceroots.mantissa.random.MersenneTwister:
>
> This class is an implementation of the Mersenne twister pseudo-random
> generator. It is a translation of the Makoto Matsumoto and Takuji
> Nishimura c code.
>
> As there is already an implementation of the Mersenne twister in commons
> math, it seems irrelevant to include this new implementation.
>
> Luc
>
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