| are | Approximate ARE of an M-type estimator to the least-squares estimator | 
| are_nr | Newton-Raphson method for the 'are' function | 
| calvaria | Data on calvaria growth in rat skulls | 
| exp_map | Exponential map | 
| geo_dist | Geodesic distance between two points on a manifold | 
| geo_reg | Gradient descent for (robust) geodesic regression | 
| intrinsic_location | Gradient descent for location based on M-type estimators | 
| log_map | Logarithm map | 
| loss | Loss | 
| onmanifold | Manifold check and projection | 
| par_trans | Parallel transport | 
| rnormtangents | Random generation of tangent vectors from the Riemannian normal distribution |