Eigen: environment setup 安装与配置

June 10, 2020 0 comments
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Installation

Install Eigen from source code

git clone https://gitlab.com/libeigen/eigen.git

In fact, the header files in the Eigen subdirectory are the only files required to compile programs using Eigen. The header files are the same for all platforms.

  • Install using Cmake
mkdir build
cd build
cmake .. -DCMAKE_INSTALL_PREFIX=myprefix
make
make install
make doc

Eigen有用的只是些头文件，由于我一般使用Cmake来搭建自己的工程，所以我还是选择用Cmake编译安装。

这个源码工程本身就是最好的学习资料，推荐使用原码，用原码调试会更方便。

make option:

---------+--------------------------------------------------------------
Target   |   Description
---------+--------------------------------------------------------------
install  | Install Eigen. Headers will be installed to:
         |     <cmake_install_prefix>/<include_install_dir>
         |   Using the following values:
         |     CMAKE_INSTALL_PREFIX: /home/yubao/data/software/eigen
         |     INCLUDE_INSTALL_DIR:  include/eigen3
         |   Change the install location of Eigen headers using:
         |     cmake . -DCMAKE_INSTALL_PREFIX=yourprefix
         |   Or:
         |     cmake . -DINCLUDE_INSTALL_DIR=yourdir
doc      | Generate the API documentation, requires Doxygen & LaTeX
check    | Build and run the unit-tests. Read this page:
         |   http://eigen.tuxfamily.org/index.php?title=Tests
blas     | Build BLAS library (not the same thing as Eigen)
uninstall| Remove files installed by the install target
---------+--------------------------------------------------------------

Install Eigen use repo

sudo apt install libeigen3-dev

Where the Eigen is installed:

sudo updatedb
locate eigen3

The default directory is /usr/include/eigen3/

How to use Eigen in Cmake Project

  • Set Eigen3_DIR

    如果是使用自己安装的版本的话，需要让Eigen3_DIR指向cmake目录。

    Eg.

  export Eigen3_DIR=/home/yubao/data/software/eigen/share/eigen3/cmake

  • CMakeLists.txt

    cmake_minimum_required (VERSION 3.0)
project (myproject)

find_package (Eigen3 3.3 REQUIRED NO_MODULE)

add_executable (example example.cpp)
target_link_libraries (example Eigen3::Eigen)

How to compile Eigen program without Cmake

g++ -I /path/to/eigen/ my_program.cpp -o my_program

A simple first program

#include <iostream>
#include <eigen dense="">
using Eigen::MatrixXd;
int main()
{
  MatrixXd m(2,2);
  m(0,0) = 3;
  m(1,0) = 2.5;
  m(0,1) = -1;
  m(1,1) = m(1,0) + m(0,1);
  std::cout << m << std::endl;
}

Result:

 3  -1
2.5 1.5

Possible Errors

Eigen/Core: No such file or directory

[ 25%] Building CXX object CMakeFiles/useSophus.dir/useSophus.cpp.o
/home/yubao/data/project/slambook2/useSophus/useSophus.cpp:3:10: fatal error: Eigen/Core: No such file or directory
 #include <eigen core="">
          ^~~~~~~~~~~~
compilation terminated.
CMakeFiles/useSophus.dir/build.make:62: recipe for target 'CMakeFiles/useSophus.dir/useSophus.cpp.o' failed
make[2]: *** [CMakeFiles/useSophus.dir/useSophus.cpp.o] Error 1
CMakeFiles/Makefile2:67: recipe for target 'CMakeFiles/useSophus.dir/all' failed
make[1]: *** [CMakeFiles/useSophus.dir/all] Error 2
Makefile:83: recipe for target 'all' failed
make: *** [all] Error 2
➜  build git:(master) ✗

Solution:

#include <eigen3 eigen="" core="">

Refer:

References


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