ARGH!!! Matlab trouble!!! Ok, I'm having a big problem as described here: https://www.physicsforums.com/showthread.php?t=46950 Basically, I've never used matlab and was given an assignment on friday which requires that I use matlab. First off, could someone please help me with my projectile problem? Next, how the heck does one write an m-file. I know how to open the editor and the simple stuff but actually using ODE45 is killing me. The help file is about as useful as a man file--good for pro's lousy for novices. Any help would be greatly appreciated.