Re: Annoying Little Problem

*To*: mathgroup at smc.vnet.net*Subject*: [mg24865] Re: Annoying Little Problem*From*: Alan <kd7cyb at mac.com>*Date*: Wed, 16 Aug 2000 03:24:24 -0400 (EDT)*References*: <8mdm1e$5li@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

Mathematica thinks that Sqrt[v2.v2] is sufficiently accurate enough that the parameter specified to reduce it down to 3 digit precision is not used; thus, it reverts to the default 6 display digits. This is normal. Use SetPrecision of 3 instead. N[Sqrt[v2.v2], 3] should be: SetPrecision[Sqrt[v2.v2],3] Alan Nalanji Dreaming wrote: > I'm having an annoying little problem with version 4.0.1.0. I wrote the > following info in a notebook and ran it: > > Clear[v2] > v2 = {4, 0, -6} > N[Sqrt[v2.v2]] > N[Sqrt[v2.v2], 3] > > Now the third line gives me 7.2111 but the fourth line gives me the > same instead of 7.21. Does anyone have any idea what may be the problem? > Am I doing something wrong? > > thanks, > Nalanji Dreaming