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MathGroup Archive 1999

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Re: interpolatingfunction

  • To: mathgroup at smc.vnet.net
  • Subject: [mg15887] Re: [mg15855] interpolatingfunction
  • From: "Kevin J. McCann" <kevinmccann at Home.com>
  • Date: Wed, 17 Feb 1999 23:33:37 -0500
  • Sender: owner-wri-mathgroup at wolfram.com

Here is an example:

sol=NDSolve[{x''[t] + x[t] == 0,x[0]==0,x'[0]==1},x,{t,0,4Pi}][[1]]
f=x/.sol
Plot[{f[t],f'[t]},{t,0,4\[Pi]}];

Note the [[1]] at the end of the first line.  This does away with an
extra set of { }.

Second line defines f to be the InterpolatingFunction answer.

Third shows that you can plot it and even take its derivative. Try 
{f[0],f'[0],f''[0]}.

Kevin

-----Original Message-----
From: phpcp at csv.warwick.ac.uk <phpcp at csv.warwick.ac.uk>
To: mathgroup at smc.vnet.net
Subject: [mg15887] [mg15855] interpolatingfunction


>
>hi all,
>
>i solved a d.e. using NDSolve and got a solution in
>InterpolatingFunction form. How can i define this as a function that
>returns values using an argument.
>
>thanks,
>sanjay
>
>
>



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