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Now for Error 1, it seems to be a leftover issue maybe:  

Wildly guessing it is not important for what I want to use Eigen for, I have commented it out, but Error 2 and following still remain, for which the code is:  

Now for Error 1, it seems to be a leftover issue maybe: 

Wildly guessing it is not important for what I want to use Eigen for, I have commented it out, but Error 2 and following still remain, for which the code is: 

Now for Error 1, it seems to be a leftover issue maybe:

Wildly guessing it is not important for what I want to use Eigen for, I have commented it out, but Error 2 and following still remain, for which the code is:

1. I downloaded the latest Eigen library, version 3.4.0, and unpacked the zip file.
2. I opened VS2010, started a New Project --> Empty Project.
3. Then I dragged the folder Eigen from eigen-3.4.0 onto the Project in Solution Explorer in VS2010.
4. This resulted in the .h files being loaded into the Header Files folder in the Solution Explorer.
5. I created a new .cpp file in the Source Files folder of the solution, with a very simple test script.
6. I added the Eigen folder to the Include paths: Solution Explorer --> Right-click on Solution --> Properties --> Configuration Properties --> VC++ Directories --> Include Directories --> added D:\my folder\testingEigen\eigen-3.4.0\
7. Also added this path to C/C++ --> General --> Additional Include Directories; then applied the changes.
8. I did this for both the default setting of Win32 (Platform) as well as x64, both using Debug.
9. I cannot compile successfully, the errors I get are as follows:

1. I downloaded the latest Eigen library, version 3.4.0, and unpacked the zip file.
2. I opened VS2010, started a New Project --> Empty Project.
3. Then I dragged the folder Eigen from eigen-3.4.0 onto the Project in Solution Explorer in VS2010.
4. This resulted in the .h files being loaded into the Header Files folder in the Solution Explorer.
5. I created a new .cpp file in the Source Files folder of the solution, with a very simple test script. (How to use Eigen in a C++ program?)
6. I added the Eigen folder to the Include paths: Solution Explorer --> Right-click on Solution --> Properties --> Configuration Properties --> VC++ Directories --> Include Directories --> added D:\my folder\testingEigen\eigen-3.4.0\
7. Also added this path to C/C++ --> General --> Additional Include Directories; then applied the changes.
8. I did this for both the default setting of Win32 (Platform) as well as x64, both using Debug.
9. I cannot compile successfully, the errors I get are as follows: