  Quadratic hypersurfaces are a natural generalization of affine subspaces, and
projections are elementary blocks of algorithms in optimization and machine
learning. It is therefore intriguing that no proper studies and tools have been
developed to tackle this nonconvex optimization problem. The quadproj package
is a user-friendly and documented software that is dedicated to project a point
onto a non-cylindrical central quadratic hypersurface.
