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Re: ORDINARY DIFFERENTIAL EQUATION

• To: mathgroup at smc.vnet.net
• Subject: [mg32179] Re: ORDINARY DIFFERENTIAL EQUATION
• From: "Steve Luttrell" <luttrell at signal.qinetiq.com>
• Date: Fri, 4 Jan 2002 05:03:54 -0500 (EST)
• Organization: Defence Evaluation & Research Agency
• References: <a0ugmj$5t3$1@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

"Khaled Saad" <khaledma_sd at hotmail.com> wrote in message
news:a0ugmj$5t3$1 at smc.vnet.net...
> Dear mathgroup
> I am trayin to plot the directin of vector field of system of ordinary
> differential equation but i could not
>
> the system is
> x'[t]=(1-x[t]-0.5 y[t])x[t]
> y'[t]=(1-y[t]-0.8 x[t])y[t]

Is this the sort of thing you were looking for?

<< Graphics`PlotField`

PlotVectorField[{(1 - x - 0.5 y)x, (1 - y - 0.8 x)y}, {x, -10, 10}, {y, -10,
10}];

--
Steve Luttrell
QinetiQ
Malvern Technology Centre
UK