Hi
How to resize a statically allocated matrix in eigen2?
thanks
suresh

suresh wrote:Hi
How to resize a statically allocated matrix in eigen2?
thanks
suresh

I think you are looking for the following

Code: Select all

  Matrix<double,Dynamic,Dynamic,AutoAlign,16,16> some_static_matrix(4,4);
  std::cout << sizeof(some_static_matrix) - 16*16*sizeof(double) - 2*sizeof(int) << std::endl;
  some_static_matrix.resize(5,5);
  std::cout << sizeof(some_static_matrix) - 16*16*sizeof(double) - 2*sizeof(int) << std::endl;


The size of the object is in both cases 16*16*sizeof(double) plus the size of two integers (I think it are integers in Eigen2) to store the current size. So, to have a resizable stack matrix, you have to live with the memory penalty of two additional integers (in Eigen3, two additional DenseIndex variables).

Regards,
Hauke