On Tue, Jun 12, 2018, 00:03 Stephan Houben <[email protected]> wrote:
> Hi all, > > I wrote a possible implementation of sindg: > > https://gist.github.com/stephanh42/336d54a53b31104b97e46156c7deacdd > > This code first reduces the angle to the [0,90] interval. > After doing so, it can be observed that the simple implementation > math.sin(math.radians(angle)) > produces exact results for 0 and 90, and a result already rounded to > nearest for > 60. > You observed this on your system, but math.sin uses the platform libm, which might do different things on other people's systems. > For 30 and 45, this simple implementation is one ulp too low. > So I special-case those to return the correct/correctly-rounded value > instead. > Note that this does not affect monotonicity around those values. > Again, monotonicity is preserved on your system, but it might not be on others. It's not clear that this matters, but then it's not clear that any of this matters... -n
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