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Re: Interpolation routines [message #92656 is a reply to message #92654]

Tue, 02 February 2016 12:17

wlandsman
Messages: 743
Registered: June 2000

Senior Member

On Tuesday, February 2, 2016 at 12:34:17 PM UTC-5, Craig Markwardt wrote:

>
> I found most of the built-in IDL interpolation routines to be kind of a joke. The one I use often is SPL_INIT and SPL_INTERP, which are based on the Numerical Recipes interpolation routines. You will have to screen out your NANs manually with WHERE(), but that should not be a big deal.

I don't believe this is true anymore. INTERPOL() used to be biggest problem but since IDL 7.0, it is a professional level interpolation routine (and certainly more powerful than QUADTERP).

I do agree that you best bet is to probably remove the NAN values (using WHERE and FINITE() ). I would use INTERPOL() without the /NAN keyword.

g = where(finite(y))
result = interpol( y[g], x[g], xinterp, /spline)

> The IDL Astronomy library has some other nice routines like QUADTERP. I have developed some specialized interpolators for IDL (example: Chebyshev). If you have known explicit derivatives at each sample point, then my CUBETERP or QINTERP might be of use.
>
> Craig

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[Message index]

		Interpolation routines By: laura.hike on Mon, 01 February 2016 16:47
		Re: Interpolation routines By: Craig Markwardt on Tue, 02 February 2016 09:34
		Re: Interpolation routines By: laura.hike on Tue, 02 February 2016 11:18
		Re: Interpolation routines By: wlandsman on Tue, 02 February 2016 12:17
		Re: Interpolation routines By: laura.hike on Tue, 02 February 2016 13:31
		Re: Interpolation routines By: laura.hike on Tue, 02 February 2016 13:48
		Re: Interpolation routines By: Paul Van Delst[1] on Tue, 02 February 2016 14:01
		Re: Interpolation routines By: laura.hike on Tue, 02 February 2016 14:38
		Re: Interpolation routines By: lecacheux.alain on Wed, 03 February 2016 01:34

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