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Re: QSIMP function [message #85863 is a reply to message #85856]

Sat, 14 September 2013 19:58

wlandsman
Messages: 743
Registered: June 2000

Senior Member

The point is to interpolate using values at three or more local points, rather than just approximating the curve through consecutive points as a straight line, which is what trapezoidal integration does. INT_TABULATED works by interpolating over 5 points (using cubic spline interpolation). But the OP said that INT_TABULATED was too slow, so I was offering a next step of refinement from trapezoidal integration without being as compute intensive as INT_TABULATED.

--Wayne

On Saturday, September 14, 2013 1:44:07 AM UTC-4, Craig Markwardt wrote:

> Wayne, Maria asked me about this privately. Does interpolation really improve the accuracy? My first impression would be that it might help, or it might hurt, depending on how well the interpolation routine chosen reflects the underlying nature of the curve being sampled. I don't have any good intuition about how well this works in practice.
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> Thanks,
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> Craig

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[Message index]

		QSIMP function By: fd_luni on Thu, 12 September 2013 06:31
		Re: QSIMP function By: wlandsman on Thu, 12 September 2013 07:56
		Re: QSIMP function By: fd_luni on Thu, 12 September 2013 08:40
		Re: QSIMP function By: wlandsman on Thu, 12 September 2013 08:49
		Re: QSIMP function By: fd_luni on Thu, 12 September 2013 08:58
		Re: QSIMP function By: wlandsman on Thu, 12 September 2013 10:05
		Re: QSIMP function By: fd_luni on Thu, 12 September 2013 11:01
		Re: QSIMP function By: Craig Markwardt on Fri, 13 September 2013 22:44
		Re: QSIMP function By: wlandsman on Sat, 14 September 2013 19:58

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