Hi, I'm a novice at using ODE. I want to know how can I set the period of simulation,and what are the units of length and weight in ODE, are they meter and kilogram? Thanks, Xiucai _________________________________________________________________ ÓëÁª»úµÄÅóÓѽøÐн»Á÷£¬ÇëʹÓà MSN Messenger: http://messenger.msn.com/cn