
Re: Mod and QuotientRemainder are inconsistent
Posted:
Feb 10, 2012 5:52 AM


Note also that:
Mod[12, 0.1, 1]
1.
etc., which suggest to me that the result for Mod[12,0.1] must be a bug.
Andrzej Kozlowski
On 9 Feb 2012, at 11:35, Szabolcs wrote:
> > Mod[12, 0.1] gives 0.1 despite 120*0.1 = 12. I expect this is because 0.1 is not representable in binary. > > QuotientRemainder[12, 0.1] gives {120, 0.} however, which is inconsistent with the result above. > > Quotient[12,0.1] gives 120 which is also inconsistent with Mod. > > Is this a bug or is it by design? It seems it is not safe to assume that > > QuotientRemainder[a,b] = {Quotient[a,b], Mod[a,b]} > > or that > > Quotient[a,b]*b + Mod[a,b] = a >

