How to check the version number of Eigen C++ template library?

Question

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 so

Answer 1

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.

Answer 2

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\.