NInegrate Bug

*To*: mathgroup at smc.vnet.net*Subject*: [mg116439] NInegrate Bug*From*: "Kurt TeKolste" <tekolste at fastmail.net>*Date*: Tue, 15 Feb 2011 06:34:50 -0500 (EST)*References*: <201102121019.FAA20109@smc.vnet.net> <ij83f7$o6$1@smc.vnet.net>

Has there been a resolution of the NIntegrate bug? Apparently NIntegrate produces the negative of the right answer for integrations that start and end to the left of zero -- some of the time. (Cos[x] and Sin[x^2] get the wrong result, Sin[x] is good). Since it is not clear what criterion Mathematica uses in deciding to give the wrong answer it is not clear when to use NIntegrate[] and when to use NIntegrate[*Sign[independent variable]]. And this calls into question any results for analysis that uses NIntegrate -- not a happy situation. Kurt TeKolste

**References**:**Nonorthogonal Eigenvectors***From:*"Kevin J. McCann" <kjm@KevinMcCann.com>