Sorry for asking stupid questions, but I can't understand one thing.
I wrote a sample program like this:

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#include <iostream>
#include <Eigen/Core>

int main(int, char *[])
{
  Matrix3f m3;
  m3 << 1, 2, 3, 4, 5, 6, 7, 8, 9;
  Matrix4f m4 = Matrix4f::Identity();
  Vector4i v4(1, 2, 3, 4);

  std::cout << "m3\n" << m3 << "\nm4:\n"
    << m4 << "\nv4:\n" << v4 << std::endl;
}

I've set up the path to Eigen folder in project settings, it's OK.
When I try to build, i get the following message:

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fatal error C1083: Cannot open include file: 'Eigen/Core': No such file or directory

Please, help to overcome this trouble.

Please paste exactly what you have configured in C/C++ -> General -> Additional Include Directories (assuming you are on VS.net).

- Hauke

I have the following directory structure:

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<ProjectsFolder>\cloud_analysis\point_cloud_mapping\ - root folder of the project
<ProjectsFolder>\cloud_analysis\point_cloud_mapping\include - place of Eigen folder
<ProjectsFolder>\cloud_analysis\point_cloud_mapping\include\Eigen\Core - here are all the headers

So, i use the following enty in C/C++ -> General -> Additional Include Directories:

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./include/

It seems to be OK, 'cause if i put a "sample.h" into include\Eigen\Core and write

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#include <Eigen/Core/sample.h>

I get no errors regarding the header path.

I am confused about your Eigen folder structure...

It should be like this

Directories:

include/Eigen/
include/Eigen/src

Files:

include/Eigen/Array
include/Eigen/Cholesky
include/Eigen/Core
... many more


There is only one core directory at

include/Eigen/src/Core

i.e. you can hardly put a file to

include/Eigen/Core/sample.h

since Core should be a file.

Please double check your Eigen structure. There is a Eigen root directory containting files like COPYING.GPL and COPYING.LGPL - your include should point to that folder.

- Hauke

Thanx a lot! It's evident, that last night i've copied a src sub-folder with files instead of Eigen folder.