Re: problem getting the area under a parmetric curve

*To*: mathgroup at smc.vnet.net*Subject*: [mg52763] Re: problem getting the area under a parmetric curve*From*: "Narasimham" <mathma18 at hotmail.com>*Date*: Mon, 13 Dec 2004 04:21:55 -0500 (EST)*References*: <cpauof$ipf$1@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

Roger Bagula wrote: > I used the symmetry to integrate the side > that was easiest. There is only one real zero for the x parametric > in t which helps. An Infinite integral does appear to exist for > the distribution. ... Dear Roger, May be problem with upper limit -> Infinity,hypergeometric function singularity as an improper integral for norm. Did you also try using NDSolve? If you have already not corrected it( :)next morning),the following may work partially if stopped ahead of Infinity at a large enough number. norm = Integrate[-y*f'[t], {t, 0.486313, 100}] a0 = N[Abs[2*norm]] g1 = ParametricPlot[{x, y}/(a0), {t, 0.486313, 100}] g2 = Plot[Exp[-t^2/2]/Sqrt[2*Pi], {t, -Pi, Pi}] Show[{g1, g2}] Regards, Narasimham