如何在 Ubuntu 14.04 中安装 eigen 3.3？

Question

我正在使用 Ubuntu 14.04，我想在 Ubuntu 中安装 eigen 3.3。我尝试下载最新版本的 Eigen 3 (3.3) 并安装如下

mkdir build
cd build
cmake ..
make
sudo make install 

输出喜欢

-- Installing: /usr/local/include/eigen3/unsupported/Eigen/src/Skyline/SkylineStorage.h
-- Installing: /usr/local/include/eigen3/unsupported/Eigen/src/SparseExtra/RandomSetter.h
-- Installing: /usr/local/include/eigen3/unsupported/Eigen/src/SparseExtra/MarketIO.h
-- Installing: /usr/local/include/eigen3/unsupported/Eigen/src/SparseExtra/BlockOfDynamicSparseMatrix.h
-- Installing: /usr/local/include/eigen3/unsupported/Eigen/src/SparseExtra/DynamicSparseMatrix.h
-- Installing: /usr/local/include/eigen3/unsupported/Eigen/src/SparseExtra/MatrixMarketIterator.h
-- Installing: /usr/local/include/eigen3/unsupported/Eigen/src/Splines/SplineFwd.h
-- Installing: /usr/local/include/eigen3/unsupported/Eigen/src/Splines/SplineFitting.h
-- Installing: /usr/local/include/eigen3/unsupported/Eigen/src/Splines/Spline.h

但是，当我用 来检查我当前的特征版本时dpkg -p libeigen3-dev，输出是

Package: libeigen3-dev
Priority: extra
Section: libdevel
Installed-Size: 3729
Maintainer: Ubuntu Developers <ubuntu-devel-discuss@lists.ubuntu.com>
Architecture: all
Source: eigen3
Version: 3.2.0-8
Provides: libeigen2-dev
Depends: pkg-config
Suggests: libeigen3-doc, libmrpt-dev
Size: 494158

它显示我的设置没有完成。如何在我的 Ubuntu 中安装本征版本？谢谢大家

当我在源代码中使用 CmakeList.txt 编译时，这是错误

-- ===============================================================
-- ============ Configuring CompileSettings  =====================
-- ===============================================================
-- ============= Look for required libraries =====================
-- Looking for Eigen Library with minimum version 3.2.90
-- Looking for Eigen via User Provided (or Cached) location
-- Eigen version 3.2.0 found in /usr/include/eigen3
CMake Warning at cmake/FindEigen.cmake:62 (message):
  Eigen version is less than requred version 3.2.90
Call Stack (most recent call first):
  cmake/FindEigen.cmake:73 (Eigen_Check_Version)
  CMakeLists.txt:23 (FIND_PACKAGE)


CMake Error at /usr/local/share/cmake-3.5/Modules/FindPackageHandleStandardArgs.cmake:148 (message):
  Could NOT find Eigen (missing: EIGEN_VERSION_OK) (Required is at least
  version "3.2.90")
Call Stack (most recent call first):
  /usr/local/share/cmake-3.5/Modules/FindPackageHandleStandardArgs.cmake:388 (_FPHSA_FAILURE_MESSAGE)
  cmake/FindEigen.cmake:74 (find_package_handle_standard_args)
  CMakeLists.txt:23 (FIND_PACKAGE)

Answer 1

对于那些只需要在 Ubuntu 和类似的基于 Debian 的发行版（...这是常见情况）上使用相当新版本的Eigen 3 的人，安装现有的软件包就足够了：例如，libeigen3-dev

sudo apt install libeigen3-dev

对于大多数用例来说，手动下载和安装 Eigen 3 可能是过度的。

Answer 2

Eigen c++ 是一个只有头文件的库：你不必安装它，你只需下载它，解压缩它并将你的代码链接到它。

例如，如果您的代码在 中my_favorite_cpp_folder，您可以：

cd my_favorite_cpp_folder

并且，假设您的编译器是gcc并且特征头在 /usr/local/include/eigen3/unsupported/并且您的源文件的名称是my_favorite_cpp_source_file.cpp，您可以通过执行以下操作编译和编码并将其链接到特征头：

g++ -I /usr/local/include/eigen3/ my_favorite_cpp_source_file.cpp -o my_favorite_cpp_source_file

（从上面发布的代码输出中，特征标头/usr/local/include/eigen3/在您的计算机中）