[Octave-bug-tracker] [bug #56511] tanh returns NaN for certain complex values in Windows under version 5.1.0 and 4.2.2 but not in Linux under 4.2.2.

[Philip Nienhuis]

Update of bug #56511 (project octave):

                  Status:                    None => Confirmed              
                 Release:                   5.1.0 => dev                    

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Follow-up Comment #1:

Confirmed with dev octave-6.0.0.

A little trying out:

>> tanh(355+1.0e-6*i)
ans =   1.0000e+00 + 1.7905e-314i
>> tanh(356+1.0e-6*i)
ans =  NaN


I've seen this before with Fortran libraries a long time ago, then it was
related to the (underlying) exp() library function but that is very probably
not related here.

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  <https://savannah.gnu.org/bugs/?56511>

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