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Article #366Re: Integration of Step function algorithm/code any?
From: Jeffrey Oliver Breen
Date: Fri, 28 Aug 1992 01:19
Date: Fri, 28 Aug 1992 01:19
33 lines
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1413 bytes
In article <1992Aug14.040957.16304@Princeton.EDU> muyu@burn.Princeton.EDU (Muyu Guo) writes: >I am having trouble doing the integral using either qtrap >or qsimp from Numerical Recipes: > > b > / > | f(x)dx, with a < 1, b > 2 > / > a > and f(x) = 1 (1 <= x <= 2) > = 0 otherwise > >For example a=0, b=4 or the like the results were nonsense. > >Does anyone know if there is a good way to get thru this? >Thanks a million for your attention. Since f(x) will be one from x=1 to x=2, and this range is included by the a<1 and b>2 guarantee, and the function is zero everywhere else, then the integral just becomes: 2 / | 1 dx, otherwise known as 1. Is there a reason you were trying to / 1 solve this numerically? -- +----------- | Jeffrey Oliver Breen Harvard-Smithsonian Center for Astrophysics, | (617) 495-7252 60 Garden St., Room B-340, MS 6, Cambridge, MA 02138 |
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Path: arc1-ca.pugleaf.net!sparky!uunet!gatech!psuvax1!hsdndev!cfa203!job From: job@head-cfa.harvard.edu (Jeffrey Oliver Breen) Newsgroups: sci.math.num-analysis Subject: Re: Integration of Step function algorithm/code any? Summary: The answer is 1! Message-ID: <1992Aug28.011918.22579@harlow.harvard.edu> Date: 28 Aug 92 01:19:18 GMT References: <1992Aug14.040957.16304@Princeton.EDU> Organization: Smithsonian Astrophysical Observatory, Cambridge, MA, USA Lines: 33