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MathGroup Archive 1999

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Why Doesn't N[Pi,i] Give i Digits For Small i, Mathematica 4,on NT

  • To: mathgroup at smc.vnet.net
  • Subject: [mg20220] Why Doesn't N[Pi,i] Give i Digits For Small i, Mathematica 4,on NT
  • From: R&M <randmarg at magma.ca>
  • Date: Wed, 6 Oct 1999 21:06:36 -0400
  • Organization: Magma Communications Ltd.
  • Sender: owner-wri-mathgroup at wolfram.com

If I execute:

Table[{i, N[Pi, i]}, {i, 1, 20}]

I get:

{{1, 3.14159}, {2, 3.14159}, {3, 3.14159}, {4, 3.14159}, {5, 3.14159},
{6,  3.14159}, {7, 3.14159}, {8, 3.14159}, {9, 3.14159}, {10, 3.14159},
{11, 3.14159}, {12, 3.14159}, {13, 3.14159}, {14, 3.14159}, {15,
3.14159}, {16, 3.14159}, {17, 3.1415926535897932},
{18, 3.14159265358979324}, {19, 3.141592653589793238},
{20, 3.1415926535897932385}}

I'd expect something like
{{1,3},{2,3.1},{3,3.14},{4,3.141},{5,3.1416},{6,3.14159},{7,3.141593},....



It seems N[] only works as expected above 16 digits of requested
precision.

Is my expectation wrong?  What should I do to get what I want?

My platform is WinNT 4 SP4.





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