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Re: Help!!!!!!

  • To: mathgroup at
  • Subject: [mg6949] Re: [mg6911] Help!!!!!!
  • From: seanross at
  • Date: Tue, 29 Apr 1997 20:48:28 -0400 (EDT)
  • Sender: owner-wri-mathgroup at

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

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.

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