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Re: Extrapolation in mathematica

  • To: mathgroup at
  • Subject: [mg51533] Re: [mg51507] Extrapolation in mathematica
  • From: Tomas Garza <tgarza01 at>
  • Date: Thu, 21 Oct 2004 22:20:57 -0400 (EDT)
  • References: <>
  • Sender: owner-wri-mathgroup at

The idea of interpolation is to use the behavior of a set of discrete points
to "guess" what could be happening in the intervals inside that set. This
uses the information given by the points within the range they encompass.
Extrapolation is in fact meaningless unless you assume that outside the
range of the given set the behavior of additional points will be the same as
within the range. Try for example

g = Interpolation[{2, 4, 6, 10}]
InterpolatingFunction[{{1, 4}}, <>]

This gives you a "guess" within the range {1, 4}. Then try to evaluate for
example g[11]. You get a warning message that 11 lies outside the range and
will give you then an "extrapolated" guess. T'is up to you to buy it or not.

Tomas Garza

Mexico City

----- Original Message ----- 
From: "nilaakash" <brindaban at>
To: mathgroup at
Subject: [mg51533] [mg51507] Extrapolation in mathematica

> Dear
>           Anybody could you tell me how to extrapolate data in
> mathematica. I can interpolate my data, but extrapolation is not
> working.
> Thanks.
> nilaakash

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