Re: [eigen] Eigen2 to Eigen3 Migration Path

[Benoit Jacob <jacob.benoit.1@xxxxxxxxx>]

2011/1/12 Gael Guennebaud <gael.guennebaud@xxxxxxxxx>:
> On Wed, Jan 12, 2011 at 1:57 PM, Benoit Jacob <jacob.benoit.1@xxxxxxxxx> wrote:
>> The trivial solution would have been to replace Eigen by Eigen3 and
>> EIGEN_ by EIGEN3_ everywhere in the Eigen3 sources, but that is quite
>> invasive at this stage.
>>
>> However, given that that solves the problem once and for all, also for
>> any future version, it's quite tempting.
>>
>> Would you agree with such a change?
>
> but think about the hundreds of projects which are already using
> Eigen3... I'm afraid this is much too late for such a change. Let's
> first see whether EIGEN2_SUPPORT could not solve the issue.

My assumption here was that Eigen2 still has many more users than
Eigen3 has, but indeed experimental data proves me wrong:
   http://stats.tuxfamily.org/eigen.tuxfamily.org/
I copied the list of visited pages on our website with number of
visits in January 2011, and did:

bjacob@cahouette:~$ grep /dox/ stats | cut -f 2 -d ' ' | awk '{ SUM +=
$1} END { print SUM }'
663
bjacob@cahouette:~$ grep /dox\-devel/ stats | cut -f 2 -d ' ' | awk '{
SUM += $1} END { print SUM }'
617

So we seem to have almost as many users on Eigen3 as we have on Eigen2.

Solving the present problem with EIGEN2_SUPPORT would be great indeed.
Let's wait to hear back from Tully about that. We can probably extend
EIGEN2_SUPPORT to do many more things you may need.

Benoit


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> gael
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