Hi all,
How I configure Code::Blocks for using Eigen3 library ?
thanks
bye

I'm not a Code::Blocks user but all you have to do is to configure your project to add the path to Eigen's headers in the set of default include directories. E.g., if the Eigen/Core header is in:

/usr/local/eigen3/Eigen/Core

then you have to add the /usr/local/eigen3 folder.

hi,
thank you for reply.
I addeed path to eigen in:
1. project-> build options -> search directory -> compiler
2. project-> build options -> search directory -> Linker
3. project-> build options -> search directory -> resource compiler

but nothing, there are any errore:

Code: Select all

/home/ric/Documenti/temp/prova_ITcpp/prova_eigen/eigen/main.cpp|2|error: Eigen/Dense: Nessun file o directory|
/home/ric/Documenti/temp/prova_ITcpp/prova_eigen/eigen/main.cpp|4|error: ‘Eigen’ has not been declared|
/home/ric/Documenti/temp/prova_ITcpp/prova_eigen/eigen/main.cpp||In function ‘int main()’:|
/home/ric/Documenti/temp/prova_ITcpp/prova_eigen/eigen/main.cpp|8|error: ‘MatrixXd’ was not declared in this scope|
/home/ric/Documenti/temp/prova_ITcpp/prova_eigen/eigen/main.cpp|8|error: expected ‘;’ before ‘m’|
/home/ric/Documenti/temp/prova_ITcpp/prova_eigen/eigen/main.cpp|9|error: ‘m’ was not declared in this scope|
||=== Build finished: 5 errors, 0 warnings ===|

The file .cpp is:

Code: Select all

#include <iostream>
#include <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;
}

Why ?

What's the exact path that you included?
Note that you've got to include /path/where/eigen/is/ and not /path/where/eigen/is/Eigen/

wonderful !!!
Work !!
Was this the problem.
Thank you
bye