No Bug found...

*To*: mathgroup at yoda.ncsa.uiuc.edu*Subject*: No Bug found...*From*: uunet!decide!bobk (Bob Korsan)*Date*: Wed, 15 Aug 90 10:54:30 PDT

You write: ----- Begin Included Message ----- >From saxony!uunet!yoda.ncsa.uiuc.edu!mathgroup-adm Tue Aug 14 20:59:46 1990 From: uunet!phobos.mathcs.carleton.edu!johnsonj To: mathgroup at yoda.ncsa.uiuc.edu Subject: Is N[10^-11,16] = a. 99999999999999e-12 a known bug? There is a curious bug in the N[] function, involving (as far as I can tell) only calculations at sixteen decimal places. I did a quick check with Table[Table[{i, j, N[10^-i, j]}, {j, 1, 2 * i}], {i, 1, 50}] and got errors for i = {11, 20, 25, 32, 36, 40}, all at i = 16. Is this a bug in the most recent release? (If so, better let Wolfram know!) Also, is there a way around it besides avoiding the use of sixteen? It just so happens that CForm[N[x, 16]] is absolutely ideal for sending data to a C program with double precision reals... Jonathan johnsonj at mathcs.carleton.edu Mathematica user Mike Tie, mtie at mathcs.carleton.edu ----- End Included Message ----- I tried your problem on both a Unix kernel (Sun 386i) and a MacIIx. Both version 1.2.1. No bug for i={11,20} and I assume the rest of the cases you tried. What machine and what version of Mathematica are you using? Peace/Bob