RiemStiefel             Tools for Inference, Learning, and Optimization
                        on Stiefel Manifold
st.mean                 Fréchet Mean on Stiefel Manifold
st.runif                Generate Random Samples from Uniform
                        Distribution on Stiefel Manifold
st.utestR               Test of Uniformity via Rayleigh Statistic on
                        Stiefel Manifold
stopt.SA                Optimization over Stiefel Manifold with
                        Simulated Annealing
