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Q:Is there a "effective digit" function?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg6937] Q:Is there a "effective digit" function?
  • From: Shiou-Jhy Ja <jshiouj at radar.ecen.okstate.edu>
  • Date: Tue, 29 Apr 1997 20:48:17 -0400 (EDT)
  • Organization: Oklahoma State University, Stillwater OK
  • Sender: owner-wri-mathgroup at wolfram.com

Hi:
	Mma 3.0 alwayse give us good precision result.  let's say my result is
1.234567890123456, and I just want 1.234.  How can I do that?
I've tried N[1.234....,2], but still get the same result.  

	Next try is to use NumberForm[], but the outcome seems not to be a
number.  I can't use test=NumberForm[...], then do test+1.

	The worst way I've done is to use:
Round[1.2345....*1000]/1000
but the numerical error still give me problems.  The output sometimes
like 1.2340000000001.  

Somebody please tell me where I can find an answer!  Thank you very
much!


Puck


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