1. installation
sudo apt-get install libeigen3-dev
2. 解决 fatal error: Eigen/Core: No such file or directory
When you call eigen library, will get an error: fatal error: Eigen / Core: No such file or directory
This is because the library is installed by default eigen the / usr / include / eigen3 / Eigen lower path, use the following command is mapped to / usr / include path
sudo ln -s /usr/include/eigen3/Eigen /usr/include/Eigen