Example 15.   Use the Modified Euler Method to find numerical solutions to the D. E.  [Graphics:Images/HarvestingModelMod_gr_271.gif].  

Solution 15.

The solution curves with the initial conditions  [Graphics:../Images/HarvestingModelMod_gr_272.gif]  can all be computed over the interval  [Graphics:../Images/HarvestingModelMod_gr_273.gif].  
However the solution curves with the initial conditions   [Graphics:../Images/HarvestingModelMod_gr_274.gif]   must be computed over smaller intervals,
for instance the intervals   [Graphics:../Images/HarvestingModelMod_gr_275.gif].

[Graphics:../Images/HarvestingModelMod_gr_276.gif]


[Graphics:../Images/HarvestingModelMod_gr_277.gif]

[Graphics:../Images/HarvestingModelMod_gr_278.gif]

[Graphics:../Images/HarvestingModelMod_gr_279.gif]

[Graphics:../Images/HarvestingModelMod_gr_280.gif]

[Graphics:../Images/HarvestingModelMod_gr_281.gif]

[Graphics:../Images/HarvestingModelMod_gr_282.gif]

[Graphics:../Images/HarvestingModelMod_gr_283.gif]

Now all the solution curves can be shown on one graph.

[Graphics:../Images/HarvestingModelMod_gr_284.gif]


[Graphics:../Images/HarvestingModelMod_gr_285.gif]

This is the same as the graph that was obtained in Example 13.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(c) John H. Mathews 2004