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[Octave-bug-tracker] [bug #45507] acos returns different results on big
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From: |
anonymous |
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Subject: |
[Octave-bug-tracker] [bug #45507] acos returns different results on big input values |
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Date: |
Fri, 10 Jul 2015 07:06:11 +0000 |
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User-agent: |
Mozilla/5.0 (Windows NT 6.1; WOW64; rv:38.0) Gecko/20100101 Firefox/38.0 |
Follow-up Comment #2, bug #45507 (project octave):
Sorry, I didn't pay enough attention to the sign of the imaginary part. You
were right Rik. Here are the double checked results:
Matlab (R2013b):
acos(1e7) = 0.0000 +16.8112i
acos(1e8) = 0.0000 +19.1138i
Octave 3.8.2:
acos(1e7) = 0.00000 - 16.81124i
acos(1e8) = 0.00000 - 19.11383i
Octave 4.0.0:
acos(1e7) = 0.00000 + 16.80543i
acos(1e8) = NaN + Infi
Conclusion: The changes from Octave 3.8.2 to 4.0.0
* improved the Matlab compatibility regarding the sign of the imaginary part.
* but partly destroyed the compatibility regarding the values of the real
part. (for input values >~6e7)
(In my calculations I only used the real part, so that's why I bothered about
this most...)
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