3 ms·

Ah really? What is the purpose of that?

• detaro 8y ago
  Not sure. Via https://stackoverflow.com/questions/19236117/what-numerical-algorithm-is-simplified-by-defining-sqrt-0-0-as-0-0 https://stackoverflow.com/questions/19236117/what-numerical-... I found https://people.freebsd.org/~das/kahan86branch.pdf https://people.freebsd.org/~das/kahan86branch.pdf, but that's a more complex read than I'm prepared for right now ;)
  • jacobolus 8y ago
    That paper is about implementing branch cuts in a complex-valued function (e.g. complex square root), and doesn’t discuss real square roots. In the context of that paper it seems to me that √(–0 – 0i) should be 0 – 0i and √(–0 + 0i) should be 0 + 0i, but under no circumstances should the result be –0 ± 0i, which is on the wrong branch. The obvious extension to real-valued square root would be √(–0) == +0.