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From Al Chou <>
Subject Re: [math] SoC Commons-Math Status
Date Tue, 09 Aug 2005 14:48:46 GMT
Thanks, James.  Looking forward to the code!


--- James M Stephenson <> wrote:
> I was worried about using any code from Numerical Recipies, so I have 
> refrained from doing so and am using it as a reference in addition to 
> Cantrell's book.  The only thing I am using it for is the bits of theory 
> here and there within it, not the algorithms.  I am developing those 
> myself.  The NR reference is not being used for the compressed matrix 
> class, I am not using anything for that apart from Cantrell's book and 
> the Lapack reference manual.  I am not reusing any code or algorithms 
> from either book.  I will post my JUnit tests and code this evening for 
> review.
> James
> Al Chou wrote:
> >Yes, good point, Martin.
> >
> >James, please see
> > for
> an
> >example of our exercising a decision we made early in Commons Math's history
> >regarding code derived from _Numerical Recipes_ (in short, using _NR_ as a
> >source for code without getting written permission violates their license,
> and
> >their license is not compatible with the Apache License anyway).
> >
> >Also please see for
> >general information and guidelines for Commons Math contributors.
> >
> >I strongly recommend you post whatever JUnit tests and code you currently
> have,
> >regardless of what shape it's in, either to the list or somewhere accessible
> >via Internet, before continuing with any more coding.  At this point it is
> >going to be important to make sure you're not wasting your time; deriving
> code
> >from _NR_ is not compatible with (probably most if not all) open source
> >licenses, so it's not just an Apache Software Foundation issue.
> >
> >
> >Al
> >
> >
> >
> >--- Henri Yandell <> wrote:
> >  
> >
> >>Especially Phil/Al as mentors.
> >>
> >>On 8/8/05, Martin Cooper <> wrote:
> >>    
> >>
> >>>Hmm, I'm a little concerned at the reference to Numerical Recipes. The
> >>>NR folks have strict limitations on how their work may be used. For
> >>>example, see:
> >>>
> >>>
> >>>
> >>>Can someone more familiar with this chime in on the extent to which we
> >>>may have issues with this, if any?
> >>>
> >>>--
> >>>Martin Cooper
> >>>
> >>>
> >>>On 8/8/05, James M Stephenson <> wrote:
> >>>      
> >>>
> >>>>Compressed Matrix class and arithmetic components are coming along, I
> >>>>should have a good post soon.  I've got a few more methods to write for
> >>>>the compressed matrix class.  I hope to be finished with my project on
> >>>>8/21 right now including getting ripped up by the community, I really
> >>>>should not have done the hardest part first (The compressed matrix
> >>>>class).  It is really proving to be difficult to come up with a
> >>>>completely sound method of doing it, especially one that follows along
> >>>>the lines of commons development, I am using the Numerical Recipes set
> >>>>of books as a good reference along with Cantrell's Modern Mathematical
> >>>>Methods for Physicists and Engineers.  I will definitely have a post
> >>>>a patch to discuss this week, and if all goes well, I should have the
> >>>>decomposer done next week midweek.
> >>>>
> >>>>Sincerely,
> >>>>James

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