void Foam::mosDMDEigenBase::realSymmEigenSolver(const Eigen::MatrixXd& M, Eigen::DiagonalMatrix<scalar, Eigen::Dynamic>& S, Eigen::MatrixXd& U)
{
// Solve eigenvalues and eigenvectors
Eigen::SelfAdjointEigenSolver<Eigen::MatrixXd> eigenSolver;
eigenSolver.compute(M);
// Sort eigenvalues and corresponding eigenvectors
// in descending order
SortableList<scalar> sortedList(M.rows());
forAll (sortedList, i)
{
sortedList[i] = eigenSolver.eigenvalues()[i];
}
// Do sort
sortedList.sort();
label n = 0;
forAllReverse(sortedList, i)
{
S.diagonal()[n] = sortedList[i];
U.col(n) = eigenSolver.eigenvectors().col(sortedList.indices()[i]);
n++;
}
units::quantity<units::si::length,float>
length_in_sample_space( int d, units::quantity<units::camera::length,float> l ) const
{ return to_sample.diagonal()[d] * l.value() * units::si::meter; }
units::quantity<units::camera::length,float>
length_in_image_space( int d, units::quantity<units::si::length,float> l ) const
{ return to_image.diagonal()[d] * l.value() * units::camera::pixel; }