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[Octave-bug-tracker] [bug #45507] acos returns different results on big
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From: |
Mike Miller |
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Subject: |
[Octave-bug-tracker] [bug #45507] acos returns different results on big input values |
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Date: |
Fri, 04 Mar 2016 18:51:59 +0000 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:44.0) Gecko/20100101 Firefox/44.0 Iceweasel/44.0.2 |
Follow-up Comment #23, bug #45507 (project octave):
My patch still needs work, fails a test in make check:
>> acos (-2)
ans = 3.14159265358979 + 1.31695789692482i
I only guessed at how to correct the phase by looking at the current code, I
am no expert at complex analysis. If someone can tell me how to fix the sign
of the output of std::acos so it corresponds to Matlab and other numerical
software I can incorporate that.
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