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I added several different versions of Eigen to default including directory of Visual C++. But I got collapse problem when using LDLT (Cholesky decomposition) for some of the testing numerical examples.

So I want to determine which version is actually active when debugging the code.

Is there any function which can indicate the current active Eigen version number?

LCFactorization
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    At compile-time you have `EIGEN_WORLD_VERSION`, `EIGEN_MAJOR_VERSION` and `EIGEN_MINOR_VERSION`, you can easily embed this information in your application. – Marc Glisse Feb 01 '14 at 12:21
  • Thank you very much. One more question, if they are `3`, `1` and `91` respectively, does this mean the most latest `3.20` since there is no `3.191` release? – LCFactorization Feb 01 '14 at 13:06
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    3.1.91 sounds like a beta version of 3.2 to me, but I don't know for sure. – Marc Glisse Feb 01 '14 at 13:25
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    It is not the desired 3.2.0 release. The version number macros are defined in `Macros.h` located at ``\Eigen\src\Core\util\``. thank you. – LCFactorization Feb 01 '14 at 14:14

4 Answers4

47

This answer is only a summary from the comments above:

  • At compile-time you have EIGEN_WORLD_VERSION, EIGEN_MAJOR_VERSION and EIGEN_MINOR_VERSION, you can easily embed this information in your application.

  • 3.1.91 sounds like a beta version of 3.2.

  • The version number macros are defined in Macros.h located at \Eigen\src\Core\util\.

LCFactorization
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    On Debian or similar: `cat /usr/include/eigen3/Eigen/src/Core/util/Macros.h | grep VERSION` will show you the version. – kebs Jan 31 '17 at 08:57
21

In order to check the version number of Eigen C++ template library, just type 

dpkg -p libeigen3-dev

in the terminal. Or just type

pkg-config --modversion eigen3

you will get the Eigen version.

NAK
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4

Although it is not the goal of the OP, people finding this question may be interested in checking if the version is equal to are newer than a specific release for compatibility reasons with different versions of Eigen. This can be done more easily using the EIGEN_VERSION_AT_LEAST(x, y, z) macro as follows:

#if EIGEN_VERSION_AT_LEAST(3,3,0)
    // Implementation for Eigen 3.3.0 and newer
#else
    // Implementation for older Eigen versions
#endif

This macro is also defined in Eigen/src/Core/util/Macros.h and uses EIGEN_WORLD_VERSION, EIGEN_MAJOR_VERSION and EIGEN_MINOR_VERSION internally.

m7913d
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4

On Linux:

grep "#define EIGEN_[^_]*_VERSION" /usr/local/include/eigen3/Eigen/src/Core/util/Macros.h

You'll get something like:

#define EIGEN_WORLD_VERSION 3
#define EIGEN_MAJOR_VERSION 3
#define EIGEN_MINOR_VERSION 7

It means version 3.3.7

Filippo Grazioli
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