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MathGroup Archive 1999

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Re: Linear interpolation

  • To: mathgroup at smc.vnet.net
  • Subject: [mg18059] Re: [mg18041] Linear interpolation
  • From: "Kevin J. McCann" <kevinmccann at Home.com>
  • Date: Tue, 15 Jun 1999 01:43:21 -0400
  • Delivery-date: Tue Jun 15 06:30:29 1999
  • References: <199906121952.PAA05754@smc.vnet.net.>
  • Sender: owner-wri-mathgroup at wolfram.com

You need to use Interpolation with the option InterpolationOrder->1.
Example below.  The default InterpolationOrder is 3.

Kevin


Example:

data = N[Table[{x, Sin[x]},  {x, 0, Pi, Pi/4}]]
p1 = ListPlot[data,  PlotStyle -> {AbsolutePointSize[4]}];

 f3 = Interpolation[data] (* default uses 3rd order poly *)
f1 = Interpolation[data,   InterpolationOrder -> 1](* this one does linear
interpolation *)

p2 = Plot[f1[x], {x, 0, Pi}];
p3 = Plot[f3[x], {x, 0, Pi}];
Show[p1, p2, p3];

----- Original Message -----
From: Eric <lazzaree at tcd.ie>
To: mathgroup at smc.vnet.net
Subject: [mg18059] [mg18041] Linear interpolation


>
> Hi all,
>
> which software allows, if we give it 2 series of data (temperature on time
> in my case), to calculate Y for any X, using a linear interpolation, and
how
> ? Actually, I have a serie of data for different sample with an irregulate
> step and I want to compare them. So I need to interpolate them.
>
> Thank you for any help.
>
> Eric
>
>


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