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Re: Why?

• To: mathgroup at smc.vnet.net
• Subject: [mg109991] Re: Why?
• From: "David Park" <djmpark at comcast.net>
• Date: Fri, 28 May 2010 07:20:17 -0400 (EDT)

Specify the precision with a number mark "`". You don't have to use N here.

1.000000000000000000000001`60 - 1 
Precision[%] 

1.00000000000000000000000000000000000*10^-24 
36

With less precision:

1.000000000000000000000001`30 - 1 
Precision[%] 

1.00000*10^-24 
6


David Park
djmpark at comcast.net
http://home.comcast.net/~djmpark/  


From: Alexey [mailto:lehin.p at gmail.com] 

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"?