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.