[Octave-bug-tracker] [bug #62332] acos(z), asin(z) and atan(z) , ( z = x + yi ) return wrong result for imaginary part lower than 1e-12

[Rik]

Follow-up Comment #1, bug #62332 (project octave):

Is the summary that the C++ math library on MinGW is inaccurate?

It seems that a test for the behavior can be boiled down to


imag (acos (complex (cosd (45), 1e-18)))


This should return -1.4e-18, but returns 0 on MinGW.  Is that correct?


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