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MathGroup Archive 2004

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Re: definite integral

  • To: mathgroup at smc.vnet.net
  • Subject: [mg49357] Re: definite integral
  • From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
  • Date: Fri, 16 Jul 2004 06:06:38 -0400 (EDT)
  • Organization: Universitaet Leipzig
  • References: <cd5ooi$b37$1@smc.vnet.net>
  • Reply-to: kuska at informatik.uni-leipzig.de
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,

call NDSolve it with the additional equation

integralY'[t]==y[t], integralY[0]==0

and integralY[t] will return Integrate[y[tau],{tau,0,t}]

Regards
  Jens

Josh wrote:
> 
> from the solution of a system of 2 differential equations
> 
> sol=NDSolve[{v'[t]==10^3*i[t],
> y'[t]== etc...
> 
> I get the solution y[t] for t \in [0,1], and I can plot it with the command:
> 
> Plot[Evaluate[y[t]/.sol],{t,0,0.5}, PlotRange->{-2,2}]
> 
> but I have also to compute the definite integral of y[t], between 0 and
> 0.1, how can I do?
> 
> Thanks, Josh.


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