oops, forgot the attachment....
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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