RE: Re: scaled complementary error function in Mathematica?

*To*: mathgroup at smc.vnet.net*Subject*: [mg69275] RE: [mg69259] Re: scaled complementary error function in Mathematica?*From*: "Erickson Paul-CPTP18" <Paul.Erickson at Motorola.com>*Date*: Tue, 5 Sep 2006 05:30:38 -0400 (EDT)*Sender*: owner-wri-mathgroup at wolfram.com

It would seem that by the time Exp[x^2]*Erfc[x] runs into exponent trouble, that the approximation 1/(x Sqrt[Pi]) would be sufficiently accurate for most numeric calculations. Thus, you might form a function like scaledErfc[ x_ ] := If[ x < 25000, Exp[x^2]*Erfc[x] , 1/(x Sqrt[Pi]) ] -----Original Message----- From: Peter Pein [mailto:petsie at dordos.net] To: mathgroup at smc.vnet.net Subject: [mg69275] [mg69259] Re: scaled complementary error function in Mathematica? Tanim Islam schrieb: > Hi: > > I was wondering if anyone had a package or notebook file that computes > the scaled complementary error function directly? Specifically, > something that computes exp(x^2) erfc(x)? Thanks a bunch. > > Tanim Islam Hello, what is wrong with Exp[x^2]*Erfc[x]? Peter