[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.

[Mike Miller]

Update of bug #56511 (project octave):

                  Status:               Confirmed => Wont Fix               
             Open/Closed:                    Open => Closed                 

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Follow-up Comment #3:

Octave calls the standard library function 'std::tanh(std::complex)'.

https://en.cppreference.com/w/cpp/numeric/complex/tanh

If this function returns a value on Windows that you think is incorrect, this
should probably be investigated in GCC or in the Windows system libraries. We
generally do not try to reinvent standard system library functions in Octave.

If you can show that a C++ program can call std::tanh with a complex argument
and return a different value from what Octave returns, then there may be a bug
in Octave and we can reopen this.

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