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MathGroup Archive 2000

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Re: About N in Mathematica 4

  • To: mathgroup at smc.vnet.net
  • Subject: [mg25383] Re: [mg25327] About N in Mathematica 4
  • From: "Rosa Ma. Seco" <ceie at prodigy.net.mx>
  • Date: Fri, 29 Sep 2000 01:06:14 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

This is a recurring question. You must bear in mind the distinction between
the number of digits Mathematica is using internally, and the number of
digits it is showing on your display.

 NumberForm[expr, n] prints with approximate real numbers
in expr given to n­digit precision.

 In[1]:=
Table[NumberForm[Pi//N,j],{j,1,10}]
Out[1]=
{"3.","3.1","3.14","3.142","3.1416","3.14159","3.141593","3.1415927",
  "3.14159265","3.141592654"}

Tomas Garza
Mexico City

Sistrall [mailto:silvano.stralla at tin.it] wrote:

> I've a question about the function N in Mathematica 4. I haven't found
> information about this problem.
>
> The question is: why if I use N[Pi,30] I'll have a number of 30 decimal
> digits, but with N[Pi,10] or N[Pi,3] I'll get a number of 6 digits?
>
> The right number of digits is given only if I use a precision bigger than
> the precision of the machine. But if I want a number of 3 decimal digits?



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