Re: Why?

*To*: mathgroup at smc.vnet.net*Subject*: [mg110007] Re: Why?*From*: dh <dh at metrohm.com>*Date*: Fri, 28 May 2010 07:23:09 -0400 (EDT)*References*: <htliht$arp$1@smc.vnet.net>

Hi Alexey, as you get an aswer not with 60 but only 1 digit, I assume that the input is somehow converted into lower precision. This is in agreement with: N[1000000000000000000000001/10^24 - 1, 60] what gives the correct result: 1.00000000000000000000000000000000000000000000000000000000000*10^-24 Also, if you eliminate the terminal "1", you get 0.*10^-23 Or if you replace the terminal 1 by a zero, you get 0.*10^-24 Therefore, I conlude that 1.000000000000000000000001 is read as "1", neglecting the terminal one. This is corroborated by: N[1.000000000000000000000001, 60] this gives: 1.00000000000000000000000 Why this happens, I can not tell, but it looks like a bug to me. Cheers, Daniel Am 27.05.2010 12:46, schrieb Alexey: > Hello, > Consider the following: > > In[1]:= N[1.000000000000000000000001 - 1, 60] > > Out[1]= 0.*10^-24 > > I can not understand why this happens. Can anyone explain the reason? > What is about "arbitrary precision arithmetics"? > -- Daniel Huber Metrohm Ltd. Oberdorfstr. 68 CH-9100 Herisau Tel. +41 71 353 8585, Fax +41 71 353 8907 E-Mail:<mailto:dh at metrohm.com> Internet:<http://www.metrohm.com>