[lrc]

There is good news and bad news. The ODE integrators (etc.) in Apache Commons Math are great and work with unboxed types. In SICM, however, you'll be dealing with clojure functions generated by the system to map states to their time derivatives, and those states will be stored in "up tuples" and not native java []double. So copying must happen at state-derivative evaluation time. The system attempts to win back some speed by at least avoiding interpreting the state function. For the kind of explorations the book enables, it seems good enough. Also, you can "take your equations of motion out" of the system with ->JavaScript, and run that code in the browser with a suitable JavaScript integrator and that works too.