[Octave-bug-tracker] [bug #42071] complex trig functions differ from Matlab

[Mike Miller]

Follow-up Comment #3, bug #42071 (project octave):

Ok, your original report showed the Matlab value as zero so I wasn't sure at
what level of accuracy you were looking at. You didn't provide any clear
examples from Matlab with output showing the order of error that you are
talking about.

I agree that the results are different from Matlab on the order of 10^-21 for
exp(complex(0,pi)) and agree that the error looks like it accumulates somewhat
linearly with the argument to exp.

Can you provide an example that shows the wrong sign in Octave?

Please do continue to investigate. It might also help to note whether tests in
each are done on x86 or x86_64, in case results are cpu-dependent.

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