DFIELD6 is an interactive tool for studying single first order differential equations. When DFIELD6 is executed, a DFIELD6 Setup window is opened. The user may enter the differential equation and specify a display window using the interactive control

画常微分方程的方向场；点击方向场平面图，出现初值曲线。-The direction of the field painting of ordinary differential equations Click Floor Plan direction, there initial curve.

Solve differential equations, higher order method.DFSOLVE integrates a single ordinary differential equation using 4th and 5th order Runge-Kutta formulas. This routine is designed to be used only with DFIELD.-Solve differential equations, higher orde