bigeigen                Big eigenvalue calculation
fusedL2DescentGLMNet    Optimise the fused L2 model with glmnet (using
                        transformed input data)
fusedLassoProximal      Fused lasso optimisation with proximal-gradient
                        method. (Chen et al. 2010)
fusedLassoProximalIterationsTaken
                        Following a call to fusedLassoProximal, returns
                        the actual number of iterations taken.
generateBlockDiagonalMatrices
                        Generate block diagonal matrices to allow for
                        fused L2 optimization with glmnet.
