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Once the data from initn.m has been entered and initialized, typing rk4plot will create a graph of each 4th order Runge-Kutta approximation associated with a step size from hvec. All are plotted on the same axis on top of the slope field. (Note: We will not derive the iteration scheme for Runge-Kutta methods, so there is no analog to eulerfcn in initn.m. However you must have some string entered for eulerfcn so the variable is defined.) As for eulplot.m, the command window shows the computed numbers.

Michael Renardy