Numerical ODE solver and plotter

1. Download numsolver.m and place the file in the workspace or d: drive.
2. open up a matlab session.
3. type cd d: at the matlab prompt (>>)
4. type numsolver('start') to begin the program.
5. To enter a differential equation, type in the right-hand sides of the first-order system.
6. input the initial conditions, step size, starting time value, and number of steps.
7. hit the Solver button.
8. The upper graph is the Phase Portrait and the lower graph is the two plots of x vs. t and y vs. t .
9. Repeat.