Re: Differential Equation: Not getting result

• To: mathgroup at smc.vnet.net
• Subject: [mg127342] Re: Differential Equation: Not getting result
• From: "Nasser M. Abbasi" <nma at 12000.org>
• Date: Wed, 18 Jul 2012 01:39:32 -0400 (EDT)
• Delivered-to: l-mathgroup@mail-archive0.wolfram.com
• Delivered-to: mathgroup-newout@smc.vnet.net
• Delivered-to: mathgroup-newsend@smc.vnet.net
• References: <ju2tfb\$s65\$1@smc.vnet.net>
• Reply-to: nma at 12000.org

```On 7/17/2012 12:33 AM, Rahul Chakraborty wrote:
> Dear all,
>
>   For the following code i'm not getting result. kindly tell me where i'm making mistake.
>
> Clear[x];
> r=1;
> K=1;
> eqn= (x^')[t]-r  x[t]  (1-x[t]/K)==0//Simplify;
> sol=NDSolve[{eqn,x[0]==1/2,x'[0]==0},x[t],{t,0,50}][[1]]
> ParametricPlot[Evaluate[{x[t]/.sol,D[x[t]/.sol,t]}],{t,0,50},Frame->True,
>AxesLabel->{"x",Overscript[x,"."]},AspectRatio->1]
> ParametricPlot[Evaluate[{t,x[t]/.sol}],{t,0,50},Frame->True,AxesLabel->{"t","x"},AspectRatio->1]
>
>
> Regards,
> rc
>

Your code is not valid Mathematica code.
Please post code that has valid syntax first. You can check
that the syntax is not valid as Mathematica shows a red line
to the right side of the cell.

ps. I do not know what (x^')[t] is supposed to be, first time I see such
code)

--Nasser

```

• Prev by Date: Recover lost PGP passphrase with Mathematica! (Done)
• Next by Date: Re: Plotting: how does one reverse the time axis tick mark values?
• Previous by thread: Re: Differential Equation: Not getting result
• Next by thread: Washington DC Area Mathematica SIG