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Smoothing Spline -- any existing efficient routines? [message #72088]

Thu, 12 August 2010 06:25

Neil B.
Messages: 2
Registered: August 2010

Junior Member

Hi,

I am trying to find the continuum of various stellar spectra. The
noise of these spectra are fairly non-intrusive and there aren't many
outliers (spikes due to calibration errors etc.).

The arrays I am working with contain about 40000+ elements.

I want to essentially turn the spectra into some linear function, so I
can remove any curvature in the observed data.

I know of the procedure Spline_smooth (http://astro.uni-tuebingen.de/
software/idl/astrolib/math/spline_smooth.html). However, this
function as the restriction tag in its header suggests, is extremely
slow.... It takes about 40 minutes to process a 1000 element sub-
array. The speed issues in this program are due to the fact that it
does not use Cholesky Decomposition. Further more, when I try the
routine on the 40000 element array I receive an error message that
informs me that there are too many elements in the array...

Does anyone know of an efficient version of this routine.

Or is there a better way for determining the continuum of a spectrum?

Thanks very much in advance.

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[Message index]

		Smoothing Spline -- any existing efficient routines? By: Neil B. on Thu, 12 August 2010 06:25
		Re: Smoothing Spline -- any existing efficient routines? By: Nikola on Wed, 18 August 2010 06:08
		Re: Smoothing Spline -- any existing efficient routines? By: malte1982 on Fri, 21 December 2012 03:31
		Re: Smoothing Spline -- any existing efficient routines? By: pgrigis on Mon, 16 August 2010 07:33
		Re: Smoothing Spline -- any existing efficient routines? By: Nikola on Mon, 16 August 2010 03:11
		Re: Smoothing Spline -- any existing efficient routines? By: florishj on Tue, 09 August 2016 08:11
		Re: Smoothing Spline -- any existing efficient routines? By: norm.sheppard on Wed, 26 October 2016 14:04

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