Run the script main_approxEndPhi.m to generate the plots in Section 5 and the table in Section 6 of Structure-preserving Krylov Subspace Approximations for the Matrix Exponential of Hamiltonian Matrices: A Comparative Study by Peter Benner, Heike Faßbender and Michel-Niklas Senn This script is a modified version of the script used to generate the plots given in Section 4.3 of the thesis A Potpourri of Structured Krylov Subspace Methods: Approximated Exponential Integrators, Symplectic Model Order Reduction for Hamiltonian Systems, Krylov-Lagrangian Subspaces of Skew-Hamiltonian Matrices by Michel-Niklas Senn original version written by Michel-Niklas Senn, March 2022 see https://zenodo.org/records/17328559 using MATLAB 2021Rb modified by Heike Faßbender, October 2025