I am using Eigen library in C++. According to Eigen documentation : In order

Question

0

Asked: June 9, 20262026-06-09T15:24:11+00:00 2026-06-09T15:24:11+00:00

I am using Eigen library in C++. According to Eigen documentation : In order

0

I am using Eigen library in C++. According to Eigen documentation:

In order to use Eigen, you just need to download and extract Eigen’s
source code (see the wiki for download instructions). 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. It is not necessary to use CMake or install anything.

So in Netbeans I added the directory of Eigen into the “include directories”. Then I used a simple program as below (which is provided in Eigen documentation):

#include <iostream>
#include <Eigen/Dense>

using namespace std;
using namespace Eigen;

int main()
{
   Matrix3f A;
   Vector3f b;
   A << 1,2,3,  4,5,6,  7,8,10;
   b << 3, 3, 4;
   cout << "Here is the matrix A:\n" << A << endl;
   cout << "Here is the vector b:\n" << b << endl;
   Vector3f x = A.colPivHouseholderQr().solve(b);
   cout << "The solution is:\n" << x << endl;
}

Netbeans draws a red underline for colPivHouseholderQr() method!! In addition I can not see the colPivHouseholderQr() method under methods that can be called on object A.

Surprisingly, everything works fine and the program compiles and runs correctly although I have red underline for colPivHouseholderQr() !!

What can be wrong with my configurations ??

enter image description here