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Re: QSIMP function [message #85828 is a reply to message #85827]

Thu, 12 September 2013 07:56

wlandsman
Messages: 743
Registered: June 2000

Senior Member

You need to distinguish between 2 cases:

1. You know the function f(x) so that you can it evaluate it at any x. This is the type of problem that QSIMP is meant for. ( I prefer to use Craig Markwardt's QPINT1d http://cow.physics.wisc.edu/~craigm/idl/down/qpint1d.pro )

2. You have tabulated X,Y values but no functional form. Here you can do summation of trapezoids (as in
http://idlastro.gsfc.nasa.gov/ftp/pro/math/tsum.pro ). But if there is any continuity to your function at all, then I would try using INT_TABULATED .

--Wayne

On Thursday, September 12, 2013 9:31:49 AM UTC-4, fd_...@mail.com wrote:
> Instead of using the QSIMP function can I write the code as a summation and use also the Simpson's rule?

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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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