[PD] tanh approximation

[Thomas Grill]

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Am 07.10.2008 um 14:46 schrieb Thomas Grill:

> Hi,
>
>> An approximation to tanh(x) is a continued fraction
>> x/1+ (x^2)/3+ (4x^2)/5+ (16x^2)/9+ ...
>
> are you sure this is correct?
> Another well-known formulation is x/(1+x^2/(3+x^2/(5+x^2/(7+.....
> which works for me and converges quickly.
> see http://nrich.maths.org/public/viewer.php?obj_id=1451
>
> gr~~~
>
>
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