factor_covariance       Compute the square-root and inverse square-root
                        of a non-negative definite matrix.
restrictedMVN-package   Sampler from multivariate normal with affine
                        constraints
sample_from_constraints
                        Sample from multivariate normal distribution
                        under affine restrictions
thresh2constraints      Translate between coordinate thresholds and
                        affine constraints
whiten_constraint       Transform non-iid problem into iid problem
