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Question: plotting using DEplot

Question:plotting using DEplot

allen 5
February 13 2012
0

i have a differential equation like below

with(DynamicSystems):

sys1 := diff(y(t), t) = (800-y(t))*y(t)/(100+y(t))-450

with(DETools):

ivs3:=[y(0)=100,y(0)=250,y(0)=800]:

DEplot(sys1,y(t),t=0..1000,ivs3);

i tried to plot this diff equation but received an error message:

Warning, plot may be incomplete, the following error(s) were issued:

cannot evaluate the solution further right of .62568996, probably a singularity

Warning, plot may be incomplete, the following error(s) were issued:

cannot evaluate the solution further right of 3.1899535, probably a singularity

Warning, plot may be incomplete. the following error(s) were issued:

cannot evaluate the solution further right of 6.5800520, probably a singularity

I NEED HELP PLEASE.
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