From: Joel VanderWerf Date: 2002-03-22T04:52:46+09:00 Subject: Re: disease model A minor comment: you can use Math::exp instead of defining it yourself. I'm glad to see other folks using Ruby for simulation. I'm using it for hybrid systems simulations--hybrid systems are finite state machines with ODE's attached to each state--of vehicle and controllers. Any other simulation folks out there?