MathGroup Archive 2002

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Plotting direction fields for a logistic equation


Hi there:
I've been trying to use PlotVectorField for the
following differential equation:
dy/dt = 0.08*y*(1-y/1000)
but I haven't been successful yet.
I tried to do the following:
f[t_, y_] := {1, 0.08*y*(1 - y/1000)}
<<Graphics`PlotField`
PlotVectorField[f[t, y], {t, 0, 80}, {y, 0, 1400}];
but I'm getting a meaningless plot so I'd appreciate
if someone could tell me what is what I'm doing wrong.
Thank you very much in advance,
Ruben

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