Sofware Version: MATLAB R2024a
We explain how to generate Figures 1-3 from the preprint by running 'Integrator_Klein_Gordon.m':
The Parameter 'j' in line 4 of 'Integrator_Klein_Gordon.m' specifies the precision of the simulation. Running the simulation with j=8 is quick, with j=9 takes a few minutes, and with j=10 takes LONG (~12h).
-To obtain Fig.1 and Fig.2 from the preprint, choose j=10. The approximate growth rate of the L^2-norm of theta is returned as text.
-To obtain Fig.3 from the preprint, choose j=9, and change all '4's in lines 25-26 of 'Integrator_Klein_Gordon.m' to '7's.
We suggest doing all simulations with j=8 (or j=9), the results are qualitatively the same.