TI-85 Program:  DIRFIELD

This program will allow plot a direction field or slope
field for a given first order linear differential
equation. You can display a slope field, display the
slope field and the plot of the solution by Euler's
method, approximate a value using Euler's method.

1. Run the program.
2. Work your way across the menu, dy/dx-enter the 
   differential equation, Range-set the graph window, SlpFld-
   draw the slope fields and EulrM-Eulers method.  When 
   entering the equation, be sure use lower case x and/or y.
3. Enter to return to menu.
4. For Euler's method you will need to set the initial
   condition-x0,y0, the increment-h, plot the solution
   using Euler's method-DrElr or select more options-EulrY.
5. To approximate a value by Euler's method enter the 
   final value for x-x1, the increment-h, and the find
   the y value-y1.

Return will allow you to go back to the previous menu, 
Exit will quit the program.


Last updated: 3/4/98