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问题描述
所以,我正在使用Eigen矩阵库(版本3.3.7),我正在尝试测试一切,看看一切都很顺利。但是,在下面的测试程序中:
我尝试过:
So, I'm using the Eigen matrix library (version 3.3.7), and I'm trying to test things out and see that everything's going fine. However, on the test program below:
What I have tried:
#include <iostream>
#include <sstream>
#include <Eigen/Dense>
using namespace std;
using namespace Eigen;
int main()
{
cout << "Hello World!" << endl;
MatrixXd A;
A << 1, 2, 3,
4, 5, 6,
7, 8, -9;
cout << A << endl;
cin.get();
return 0;
}
我收到一个错误:
I'm getting an error:
<pre>"Exception thrown at 0x________ in Matrices.exe: 0xC0000005: Access violation writing location 0x00000000."
奇怪的是,如果我初始化Matrix3d而不是MatrixXd,一切都会好起来的。谁能帮助我并弄清楚如何解决这个问题?
Oddly enough, everything goes fine if I initialise a Matrix3d instead of a MatrixXd. Could anyone help me and figure out how to fix this?
推荐答案
Eigen::MatrixXd a( 3, 3 );
a << 1, 2, 3,
4, 5, 6,
7, 8, 9;
std::stringstream s;
s << a;
trace( "%s\n", s.str().data() );
trace是我在我的应用中使用的输出函数。问题是MatrixXd是一个动态矩阵,你必须告诉它矩阵的大小。
trace is the output function I use in my apps. The issue is MatrixXd is a dynamic matrix and you have to tell it how big the matrix is first.
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