Re: [eigen] News on sparse modules and 3.1 beta 1 on Monday

[Christoph Hertzberg <chtz@xxxxxxxxxxxxxxxxxxxxxxxx>]

On 03.12.2011 11:22, Gael Guennebaud wrote:
> Hi,
>
> maybe some of you have already noticed it, but I recently did several
> changes in the sparse modules:

Great to hear! Partially I noticed it (but I didn't follow every commit)

> - the SparseMatrix class is now more versatile and simpler to use with
> a single API to insert elements,
> - the DynamicSparseMatrix has been removed (still available in
> unsupported/SparseExtra),
> - deprecated functions have been removed,

Do you plan to keep _valuePtr(), etc? They are marked as internal, 
however they are very handy when interacting with other libraries.

> - the solvers classes moved from unsupported/ to official modules,
> - conservative matrix products,

I guess that solves http://eigen.tuxfamily.org/bz/show_bug.cgi?id=284 ?
(Except for re-computation of matrix*matrix, but that was a rather 
exotic wish)

There might be other bugs already fixed (some very old bugs just have a 
non-working link to bitbucket and have quite likely been fixed meanwhile)

> - etc.
>
> You can have a look at the updated documentation:
> http://eigen.tuxfamily.org/dox-devel/TutorialSparse.html
> to get a better idea of what's there, and as usual any feedback is
> very much appreciated.

The example code in:
http://eigen.tuxfamily.org/dox-devel/TutorialSparse.html#TutorialSparseFilling
uses 3 different identifiers for the same matrix.
And I think you should mention that it is also possible to insert 
entries at the back, keeping the compressed-ness of the matrix.

> I think that now they are sane enough to release a first beta of the
> future 3.1 version of Eigen for which stable sparse modules will be
> the major feature.

As I asked in IRC already:
Can you consider applying the patch to bug 
http://eigen.tuxfamily.org/bz/show_bug.cgi?id=382
into 3.1 beta? (Or give me suggestions how to modify/improve it)

> I plan to do the release on Monday. Though this is less critical for a
> beta release, reports of the results of the unit tests on various
> systems, especially with MSVC, would still be appreciated.
>
> cheers,
>
> gael


Christoph

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Dipl.-Inf. Christoph Hertzberg
Cartesium 0.051
Universität Bremen
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