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Re: [Q] Erfi - what is it?


In article <4gmheq$gmv at dragonfly.wolfram.com>, pherron at sphinx.Stanford.EDU
(Michael C. Herron) wrote:

> I used mathematica to solve an integral that I could not myself do
> analytically.  The output contained a function Erfi[].  What is
> Erfi[]?  I am familiar with the error function and its complement
> (Erf[] and Erfc[] in mathematica), but I do not understand Erfi[].
> The function does not appear to be in the manuals that I have seen,
> either.
> 
> If someone could translate Erfi[] or provide a reference, I would
> appreciate it.
> 
> Thanks.
> 
> Michael

Mathematica's online help says:

In[4]:=
    ?Erfi

    Erfi[z] gives the imaginary error function erfi(z) == -i
       erf(i z).

I hope this helps.

--Ian

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Ian Collier
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