Added Lorenz attractor problem #261
Merged
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Simple script that solves the non-linear equations implicitly. I also added a scipy reference solution analogously to the van der Pol problem. I used this reference solution to verify the implementation of the Jacobian. The solution also has the familiar butterfly shape.
I tried to write everything such that the changes going to v6 will be minimal, that is to say I already put in defaults instead of essential keys.
I added a hook for computing the global error at the end of the run. Because the step sizes get redistributed between the last
post_stephook and thepost_runhook, this is a bit more messy than anticipated, but it is also tested.@lisawim, now is your turn to point out the many places where I can improve ;)