1. orbit_general Orbit.m, single particle motion for: space plasma (current sheet, dipole, ...), Tokamak, Laser, ... A short code, but can treat almost all the common particle motion problems in different EM fields. 2. tokamak Orbit_tokamak: Using Lorentz force, with gyro. Rewritten from "Orbit.m". OrbitGC_qfix: Guiding center orbit with q=const. OrbitGC_qpsip: Guiding center orbit with q=q1+q2*psip+q3*psip^2. See "OrbitTokamak_doc.doc" for related formula. Hua-sheng XIE (huashengxie@gmail.com) 10:32 2012-12-28