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Re: Inverse Hyberbolic Tangent [message #33350 is a reply to message #33346]

Wed, 18 December 2002 05:39

notspecified
Messages: 14
Registered: February 2002

Junior Member

On Wed, 18 Dec 2002 13:26:18 -0000, "p.pall" <p.pall@atm.ox.ac.uk>
wrote:

> Hi,
>
> Does anyone out there know how to compute INVERSE hypebolic tangent in IDL
> 5.5?
>
> An 'Atanh' function does not appear to exist.
>

How about using complex numbers? According to Abramowitz and Stegun
4.6.16,

Arctanh( z ) = -i Arctan( i z )

Matt Feinstein does not include his email address
in the text of usenet postings.
--------
Harvard Law of Automotive Repair: Anything that goes away
by itself will come back by itself.

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		Re: Inverse Hyberbolic Tangent By: Patrick L. Nolan on Wed, 18 December 2002 10:29
		Re: Inverse Hyberbolic Tangent By: notspecified on Wed, 18 December 2002 05:39

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