Coord.to.Pattern.Matrix
                        Converts row and column indices to a pattern
                        Matrix object of Matrix class
Coord.to.Sym.Pattern.Matrix
                        Converts row and column indices to a symmetric
                        pattern Matrix object of Matrix class
Matrix.to.Coord         Takes an object of class Matrix and returns the
                        row and column indices of the non-zero elements
                        in the lower triangle.
Sym.CSC.to.Matrix       Converts symmetric Hessian stored in CSC format
                        to an object of Matrix class
get.fn                  Compute function, gradient and Hessian from
                        objects of class sparseHessianObj.
new.sparse.hessian.obj
                        Construct new object of class sparseHessianObj
sparseHessianFD-package
                        Given function, gradient, and sparsity
                        structure, returns Hessian in sparse matrix
                        format.
sparseHessianObj-class
                        Class to store function, gradient and Hessian
                        structure information
