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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: [mg124324] Re: how can one use mathematica get the approximate derivative of {x,y} data points?
  • From: "Scot T. Martin" <smartin at seas.harvard.edu>
  • Date: Tue, 17 Jan 2012 03:21:21 -0500 (EST)
  • Delivered-to: l-mathgroup@mail-archive0.wolfram.com

Setting InterpolationOrder->1 within your Interpolation function, and you can often fix the undesirable outcome you have identified.
________________________________________
From: dr DanW [dmaxwarren at gmail.com]
Sent: Monday, January 16, 2012 17:12
To: mathgroup at smc.vnet.net
Subject: [mg124324] how can one use mathematica get the approximate derivative of {x,y} data points?

The derivative curve you will get with Interpolation[]' can look very weird. I find I get better results using Interpolation[..., Method->"Spline"]'. The Spline function is continuous in first and second derivatives, so the resulting derivative is smoother.

Daniel



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