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