Whether log(0) is -Infinity or NaN should depend in some sense on what side you approach 0 from (I arbitrarily claim to be approaching it from the left in my formula, to give a NaN result there too).
I feel Math.log(-0) should be NaN in js for that reason, but it is defined to be -Infinity in the standard. Maybe there are industry standards pertaining to floating point transcendental functions that mandate this? Similarly, Math.sqrt(-0) is -0 rather than NaN. Perhaps using the more correct NaN values in these cases have caused more problems than they have solved in practice? Nick On 17 January 2014 20:16, Adam Ahmed <[email protected]> wrote: > > > On 18 January 2014 06:25, Jason Orendorff <[email protected]>wrote: > >> >> Except I think we want bitlen(0) === 0 for consistency with clz. >> >> > Just noting that this actually works: > Math.ceil(Math.log(0 + 1) / Math.LN2) === 0 > > However: > Math.ceil(Math.log(-1 + 1) / Math.LN2) === -Infinity > > Not sure how that affects a Negative NaN-cy option :) >
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