Re: Can't get Mathematica to evaluate correctly a difficult

*To*: mathgroup at smc.vnet.net*Subject*: [mg111541] Re: Can't get Mathematica to evaluate correctly a difficult*From*: "Niels R. Walet" <niels.walet at manchester.ac.uk>*Date*: Wed, 4 Aug 2010 07:33:58 -0400 (EDT)

Damien Wyart wrote: > Hello, > > I am using Mathematica 7.0.2 and playing a bit with an expression > analyzed in the following paper: > http://www.loria.fr/~zimmerma/papers/cise.pdf > > I tried many constructions with N and SetPrecision and can't get > Mathematica to output the correct result (I am not very experienced with > Mathematica). Here is the expression : > > 173746*Sin[10^22]+94228*Log[17.1]-78487*Exp[0.42] > > The correct result should be -1.341818958*10^-12 but even forcing each > term with N and a very large number, I am still not getting this value > at all. > > > Any help will be appreciated. Thanks in advance ; best regards, > > Use 30 digit precision on the reals: 173746*Sin[10^(22)]+94228*Log[17.1`30]-78487*Exp[0.42`30] -1.341818957830*10^-12 -- Prof. Niels R. Walet Phone: +44(0)1613063693 School of Physics and Astronomy Fax: +44(0)1613064303 The University of Manchester Mobile: +44(0)7905438934 Manchester, M13 9PL, UK room 7.7, Schuster Building email: Niels.Walet at manchester.ac.uk web: http://www.theory.physics.manchester.ac.uk/~mccsnrw