comp.lang.idl-pvwave archive: archive » Re: Inverse Hyberbolic Tangent

Home » Public Forums » archive » Re: Inverse Hyberbolic Tangent

Show: Today's Messages :: Show Polls :: Message Navigator
E-mail to friend

Re: Inverse Hyberbolic Tangent [message #33346]

Wed, 18 December 2002 10:29

Patrick L. Nolan
Messages: 1
Registered: December 2002

Junior Member

p.pall <p.pall@atm.ox.ac.uk> wrote:

> Does anyone out there know how to compute INVERSE hypebolic tangent in IDL
> 5.5?

> An 'Atanh' function does not appear to exist.

> Does this mean I'll have to mess about with series expansions?

This one is easy to do on paper.
If y = atan(x),
then x = .5 * ln( (1+y) / (1-y) )

Of course you need to worry about singular behavior at
the boundaries and the possibility of invalid y values.

--
* Patrick L. Nolan *
* W. W. Hansen Experimental Physics Laboratory (HEPL) *
* Stanford University *

Report message to a moderator

[Message index]

		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

Previous Topic:	Problem with database
Next Topic:	HDF SD names?

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Fri Nov 28 13:47:11 PST 2025

Total time taken to generate the page: 1.53229 seconds