[R] error function

[Prof Brian Ripley]

On Mon, 6 Mar 2006, François Pinard wrote:

> [Kjetil Brinchmann Halvorsen]
>
>> erf [in] package (CRAN) NORMT3, as help.search("error function") could
>> have told [you]
>
> It does not for me.  I would presume one needs NORMT3 installed first,
> and NORMT3 is seemingly not part of standard base R installation.

True.  And that function is really for complex arguments, and does not 
work correctly on 64-bit machines, e.g.

> erf(1)
Error in erfc(z) : Error code from TOMS 680 was  1


Perhaps more helpful is to point out that erf and erfc are simple 
transformations of pnorm.  RSiteSearch("erf") gave several results such as

http://finzi.psych.upenn.edu/R/Rhelp02a/archive/36416.html

which all point you to example(pnorm) for the details.  I'll add 
appropriate \concept fields.

-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
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