#include <Eigen/Geometry>
时间: 2023-12-28 11:05:16 浏览: 27
这是一个C++程序中的头文件,用于实现几何变换和向量运算。Eigen库提供了许多强大的类和函数,可以简化许多数学计算的实现。其中最常用的是Eigen::Matrix类,可以用于矩阵和向量的运算。此外,Eigen库还提供了许多其他类型的矩阵和向量,例如Eigen::Quaternion类,可以用于旋转变换。如果你需要在C++程序中进行几何计算,Eigen库是一个非常好的选择。
相关问题
#include <eigen3/Core> #include <eigen3/Geometry>有错误吗?
这两行代码#include <eigen3/Core>和#include <eigen3/Geometry>没有错误。它们是用于包含Eigen库的核心和几何模块的头文件。然而,根据你提供的引用内容,可能存在一个问题,即系统无法找到Eigen库文件所在的位置。这可能是因为在安装Eigen库时,它被默认安装到了/usr/include/eigen3/Eigen路径下,而不是/usr/include路径下。为了解决这个问题,你可以使用以下命令将eigen的安装路径映射到/usr/include路径下:
```shell
sudo ln -s /usr/include/eigen3/Eigen /usr/include/Eigen
```
这样,系统就能够正确地找到Eigen库文件所在的位置了。
fatal error: Eigen/Geometry: 没有那个文件或目录
This error message means that the compiler was not able to find the header file "Eigen/Geometry". This file is part of the Eigen C++ library, which provides a set of linear algebra routines.
To fix this error, you need to make sure that the Eigen library is properly installed on your system and that the compiler knows where to find it. This can be done by adding the appropriate include directories to your compiler's search path.
Here are the steps that you can follow to fix this error:
1. Download the Eigen library from the official website (https://eigen.tuxfamily.org/index.php?title=Main_Page).
2. Extract the downloaded archive to a directory of your choice.
3. In your C++ code, add the following line at the top of your file:
#include <Eigen/Geometry>
4. When compiling your code, make sure to add the directory where the Eigen library is installed to the include search path. For example, if you extracted the library to a directory called "eigen-3.3.9", you can compile your code with the following command:
g++ -I /path/to/eigen-3.3.9 my_program.cpp -o my_program
Note that the "-I" option tells the compiler to add the specified directory to the include search path.
5. Run your program and verify that the error message is no longer displayed.