[Date Index] [Thread Index] [Author Index]
Re: Numerical accuracy/precision - this is a bug or a feature?
On 7/14/2011 6:22 AM, Christoph Lhotka wrote: > Dear group! > .... > My question is: how dangerous is it to overwrite such a fundamental > function as Equal? > > Best, > > Christoph > An excellent question. Anyone who runs Mathematica in serious applications could try it and report back. Unfortunately, SameQ doesn't operate the way I suspect you think it does. Consider a = 1.100000000000000000000000000; b=1.1 SameQ[a,b] is True. Yet a and b are different. You can see this if you do SetPrecision[a,100] and SetPrecision[b,100]. 1.10000000000000000000000000000000000000117549435082228750796873653722\ 2245677818665556772087521508752 1.10000000000000008881784197001252323389053344726562500000000000000000\ 0000000000000000000000000000000 RJF