doc/examples/Tutorial_ArrayClass_addition.cpp

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

int main()
{
  Eigen::ArrayXXf a(3,3);
  Eigen::ArrayXXf b(3,3);
  a << 1,2,3,
       4,5,6,
       7,8,9;
  b << 1,2,3,
       1,2,3,
       1,2,3;
       
  // Adding two arrays
  std::cout << "a + b = " << std::endl << a + b << std::endl << std::endl;

  // Subtracting a scalar from an array
  std::cout << "a - 2 = " << std::endl << a - 2 << std::endl;
}