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MathGroup Archive 1999

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precision of floating-point-numbers

  • To: mathgroup at smc.vnet.net
  • Subject: [mg19290] precision of floating-point-numbers
  • From: Martin Stockhammer <martin.stockhammer at visualanalysis.com>
  • Date: Sat, 14 Aug 1999 01:45:15 -0400
  • Organization: Visual Analysis GmbH
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,

can anybody tell me how $MinPrecision works.
If I set $MinPrecision=100 and type:
[In] 1. - 1.*10^-20
i get
[Out] 1.
If I type 
[In] SetPrecision[1., 100]-SetPrecision[1., 100]*10^-20
i get
[Out]
0.9999999999999999999900000000000000000000000000000000000000000000000000000000000000000000000000000000

I want to set all calculation to minimum precision, how can I do this?

Thank You
Martin Stockhammer


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