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Re: Inverse of Error Function

• To: mathgroup at smc.vnet.net
• Subject: [mg5266] Re: Inverse of Error Function
• From: "David B. Wagner" <dbwagner at princon.com>
• Date: Mon, 18 Nov 1996 02:30:07 -0500
• Organization: Principia Consulting
• Sender: owner-wri-mathgroup at wolfram.com

Gustav Louw wrote:
> 
> I'm trying to find the inverse of the Error function in MMA.
> 
> I tried using InverseFunction, like this...
> 
>  InverseFunction[Erf[z]]
> 
>               (-1)
> Out[1]= Erf[z]
> 
> But when I tried to find some numerical values i got this ...
> 
> In[2]:= % /. z->1 //N
> 
>                 (-1)
> Out[2]= 0.842701

The function InverseErf is defined in the 
Statistics`InverseStatisticalFunctions` package in version 2.2.
This package has disappear in version 3.0; the functions now seem
to be built-in.