The package defines \pstODEsolve for solving initial value problems for sets of Ordinary Differential Equations (ODE) using the Runge-Kutta-Fehlberg (RKF45) method with automatic step size adjustment. The result is stored as a PostScript object and may be plotted later using macros from other PSTricks packages, such as \listplot (from pst-plot) and \listplotThreeD (from pst-3dplot), or may be further processed by user-defined PostScript procedures. Optionally, the computed state vectors can be written as a table to a text file.