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Re: IDL [message #78947 is a reply to message #296]

Fri, 06 January 2012 09:38

Russell[1]
Messages: 101
Registered: August 2011

Senior Member

There isn't a default interpolation scheme, per se. There are 10 or
so different interpolation routines, but are primarily focused on
fitting a polynomial to the data and evaluating the fit at the
requested points. In general, the lowest order is the default (so
linear interpolation). This is probably fine if your grid is well
sampled and you don't expect deviations smaller than the typical grid
spacing. Of course, you cannot create information --- so you don't
know what the curve is doing, no amount of interpolation will fix it.
But it's really a question of "how smooth you want the curve to
appear". Any interpolation scheme will be *COMPLETELY* untrustworthy
outside the limits of your data (that's called extrapolation, gulp).

http://physics.nyu.edu/grierlab/idl_html_help/mathematics9.h tml

Russell

On Jan 6, 1:22 am, shambhu <shambhu.mc...@gmail.com> wrote:
> Hi all, which Interpolation method is used in IDl by default, when
> call to Interpolation routine?

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[Message index]

		idl By: terrie on Tue, 25 February 1992 07:07
		Re: IDL By: neri on Fri, 13 May 1994 09:26
		Re: IDL By: geomagic on Fri, 13 May 1994 10:00
		Re: IDL By: stl on Fri, 13 May 1994 04:33
		Re: IDL By: gurman on Thu, 12 May 1994 19:56
		Re: IDL By: Ammar Yusuf on Mon, 21 March 2011 06:50
		Re: IDL By: David Fanning on Thu, 05 January 2012 07:49
		Re: IDL By: shambhu on Thu, 05 January 2012 22:22
		Re: IDL By: Russell[1] on Fri, 06 January 2012 09:38

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