Using numbers close to to zero in Mathematica version 6

*To*: mathgroup at smc.vnet.net*Subject*: [mg108997] Using numbers close to to zero in Mathematica version 6*From*: "Ted Ersek" <ersekt at md.metrocast.net>*Date*: Fri, 9 Apr 2010 03:34:32 -0400 (EDT)

What does Mathematica version 6 give when the following is evaluated? Here (x) is 'zero' with 80 digits of accuracy. x = SetAccuracy[0, 80]; { Abs[x] < 10^-900, Positive[x], Negative[x], NonPositive[x], NonNegative[x] }//InputForm {Sign[x], SetPrecision[x, 20], Sign[0], KroneckerDelta[x] } UnitStep[{0, 0.0, x}] Unitize[{0, 0.0, x}] ---------------------- I have version 7, but not version 6. I am finishing an update to my RootSearch package. Knowing what version 6 returns above will help me make one version of this package that is optimized for Mathematica versions 6 and 7. Thanks, Ted Ersek