Re: Modulo infinity

[Tom N Harris <telliamed@...>]

On Monday, March 31, 2014 09:46:14 PM Dan Tull wrote:
> In some cursory checking, they return results that are almost always equal
> (or different only at the 12th decimal place or so) aside from this
> discrepancy around infinity as the second operand. Meanwhile, pow (on the
> very next line in luaconf.h) just delegates to the C level pow function.

    a = 100
    b = a / 3
    print(a/b, a%b, math.fmod(a,b))

This prints "3 0 33.333333333333". I have no idea why, but it breaks the 
guarantee that a=floor(a/b)*b+a%b

By that reason, though, it's a bug for N%math.huge to return anything other 
than N since 0=floor(N/math.huge)

(Curiously, Python N%float("inf") is NaN on Windows and N on Linux. Oops)

-- 
tom <telliamed@whoopdedo.org>