致命错误:找不到"eigen3/Eigen/Dense"文件 [英] fatal error: 'eigen3/Eigen/Dense' file not found

问题描述

我尝试在Mac中使用本征.安装后，我从其主页运行一个演示.代码如下:

I tried to use eigen in mac. After I installing it I run a demo from its' main page.The code is as follows:

#include <iostream>
#include <eigen3/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;
}

然后我在终端中编写以下代码:

And I write following code in terminal:

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

结果是这样的:

aaa.cpp:2:10: fatal error: 'eigen3/Eigen/Dense' file not found

但是我可以在Xcode中完美地运行此代码.谁可以帮助我修复它?

However I can run this code perfectly in Xcode. Who can help me to fix it?

推荐答案

将包含行更改为

#include <Eigen/Dense>

或

#include <Eigen/Core>

和您的命令行

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

我建议您在编译包含多个指令的任何代码后，立即在命令行中至少添加 -O1 .

I recommend also adding at least -O1 to your command line, as soon as you compile any code with more than a few instructions.

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