Difference between revisions of "Info about 3.0"

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<div style="border: 2px solid #aa0000; padding: 1em; margin: 2em;"> '''This page was written in November 2009 in the run-up to Eigen 3.0 and has not been kept up-to-date when Eigen 3.0 was released. It is kept for historical reasons.''' </div>
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== What is Eigen 3.0? ==
 
== What is Eigen 3.0? ==
  
Eigen 3.0 is the future next major version of Eigen. It is currently under development in the ''default'' branch in our Mercurial repository. It is not API or ABI compatible with Eigen 2.0, whence the version number increase to 3.0. However, we expect porting to 3.0 to be relatively easy and are doing our best in that direction. Eigen 3.0 is co-installable with Eigen 2.0. We will also provide extensive porting documentation.
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[[3.0|Eigen 3.0]] has been released on March 19, 2011. It is not API or ABI compatible with Eigen 2.0, whence the version number increase to 3.0. However, porting to 3.0 is relatively easy and Eigen 3.0 is co-installable with Eigen 2.0. We also provide extensive [http://eigen.tuxfamily.org/dox-devel/Eigen2ToEigen3.html porting documentation].
 
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No beta of Eigen 3.0 has been released yet.
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== What is the schedule for the 3.0 release? ==
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See the [[Release schedule for 3.0]]. So far, only betas have been assigned a precise date. The final release date isn't decided yet.
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'''Note to developers:''' The release schedule mentions the various '''freezes''' . If you have a feature or a change that you want to contribute to Eigen 3.0, that must be done before the relevant freeze. If you are developing a new module, let us know about it and edit this page: [[Status of unsupported modules]].
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== What does there remain to do for 3.0? ==
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We have a [[Todo for 3.0]]. As you can see, there's a lot of work left to do. We would greatly appreciate help. Note however that a ton of work has already been done and is not mentioned in that page.
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== What are the main areas of improvement between 2.0 and 3.0? ==
 
== What are the main areas of improvement between 2.0 and 3.0? ==
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Eigen 3.0 is a major improvement on all fronts. Performance is improved everywhere. The API is much more future-proof, allowing for a long series of compatible 3.x releases. The algorithms are more reliable, in a way that was not always possible to achieve with the 2.0 API. Finally, Eigen 3.0 has a huge number of useful new features and even many whole new modules.
 
Eigen 3.0 is a major improvement on all fronts. Performance is improved everywhere. The API is much more future-proof, allowing for a long series of compatible 3.x releases. The algorithms are more reliable, in a way that was not always possible to achieve with the 2.0 API. Finally, Eigen 3.0 has a huge number of useful new features and even many whole new modules.
  
== What is the list of new features and improvements between 2.0 and 3.0? ==
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You can find more info about that in the [[3.0|3.0 page]].
 
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We haven't yet written such a document. We will do that for the 3.0 final release.
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== How are you helping us porting code from Eigen 2.0 to 3.0? ==
 
== How are you helping us porting code from Eigen 2.0 to 3.0? ==
  
 
In two main ways.
 
In two main ways.
* First, with Eigen 3, if you define EIGEN2_SUPPORT before including Eigen headers, a large part of the Eigen 2 API will be supported.
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* First, with Eigen 3, if you define EIGEN2_SUPPORT before including Eigen headers, a large part of the Eigen 2 API is supported.
 
* Second, [http://eigen.tuxfamily.org/dox-devel/Eigen2ToEigen3.html here is a page] on porting from Eigen 2 to Eigen 3, with a lot of tips.
 
* Second, [http://eigen.tuxfamily.org/dox-devel/Eigen2ToEigen3.html here is a page] on porting from Eigen 2 to Eigen 3, with a lot of tips.
  

Latest revision as of 13:57, 21 December 2016

This page was written in November 2009 in the run-up to Eigen 3.0 and has not been kept up-to-date when Eigen 3.0 was released. It is kept for historical reasons.

What is Eigen 3.0?

Eigen 3.0 has been released on March 19, 2011. It is not API or ABI compatible with Eigen 2.0, whence the version number increase to 3.0. However, porting to 3.0 is relatively easy and Eigen 3.0 is co-installable with Eigen 2.0. We also provide extensive porting documentation.

What are the main areas of improvement between 2.0 and 3.0?

Eigen 3.0 is a major improvement on all fronts. Performance is improved everywhere. The API is much more future-proof, allowing for a long series of compatible 3.x releases. The algorithms are more reliable, in a way that was not always possible to achieve with the 2.0 API. Finally, Eigen 3.0 has a huge number of useful new features and even many whole new modules.

You can find more info about that in the 3.0 page.

How are you helping us porting code from Eigen 2.0 to 3.0?

In two main ways.

  • First, with Eigen 3, if you define EIGEN2_SUPPORT before including Eigen headers, a large part of the Eigen 2 API is supported.
  • Second, here is a page on porting from Eigen 2 to Eigen 3, with a lot of tips.

Do you plan to keep API compatibility for a longer period after 3.0?

Yes. We plan to enter a series of 3.x releases that will be fully compatible, only adding new API but not changing or removing existing API.