- To: mathgroup at smc.vnet.net
- Subject: [mg6949] Re: [mg6911] Help!!!!!!
- From: seanross at worldnet.att.net
- Date: Tue, 29 Apr 1997 20:48:28 -0400 (EDT)
- Sender: owner-wri-mathgroup at wolfram.com
Eusebio Guevara Villegas wrote: > > I integrated the following equation: (e^(x^2)) with mathematica, and it > give me the following result: (Sqrt[Pi] Erfi[x])/2. My question is: What > the Erfi means...... I consult the kernel help and it is about Gaussian > Distribution, but I don't know what it is? > > Thanks for your help. > Sinceresly > Gustavo Lozano Ibarra > al540562 at campus.maz.itesm.mx Erfi is defined on 1079 of the mathematica book. It is, essentially, the integral you describe. There is no deeper definition. It is a relatively common integral, so people have found it valuable to make fast-executing functions so you can plot out the error function. If you are looking for the conceptual meaning or statistical interpretation of the error function, then you will need a statistics text.