altered single_pen() function to return max array index but no joy with the energy ratio plots :(
fixed the energy plots. It transpired my maths for the RK4 method was off. I am a happy man :)
removed old stability tests (previously commented out)
added headings and subheading to report (it's that time guys) - been messing with step size vs R for dp
added more to my report
altered double_pen.cpp to output energies of individual pendulum bobs. Graphs look very good. They reveal how energy moves through the system