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Re:how can one use mathematica get the approximate derivative of {x,y} data points?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg124274] Re:how can one use mathematica get the approximate derivative of {x,y} data points?
  • From: "cedric.fuhrer" <cedric.fuhrer at laposte.net>
  • Date: Sun, 15 Jan 2012 04:50:47 -0500 (EST)
  • Delivered-to: l-mathgroup@mail-archive0.wolfram.com

hello!
you can do this too:

pointsList = {{0.03512, -0.5},{0.0351181, -0.499},...{-0.113972, 0.699},{-0.115072, 0.7}}
f = Interpolation[pointsList]

then
Plot[f'[x], {x,xmin,xmax}]
... or Integrate[f, x] or....all what you want to do with an other function.

> Message du 14/01/12 09:26
> De : "Michael B. Heaney"
> A : mathgroup at smc.vnet.net
> Copie =C3  :
> Objet : how can one use mathematica get the approximate derivative of {x,y}
data points?
>
> Hi,
>
> I have a set of {x,y} data points:
>
> {{0.03512, -0.5}, {0.0351181, -0.499}, ... {-0.113972, 0.699}, {-0.115072,
> 0.7}}
>
> These data points look like a function y=f(x) when plotted on the x-y axes.
> However, I do not know what the function f(x) is. But I need to get the
> approximate derivative df/dx, as another set of data points. How can one
> use Mathematica to do this?
>
> Thanks,
>
> Michael
>
> --
>

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