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MathGroup Archive 2005

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Re: Rounding?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg60891] Re: [mg60881] Rounding?
  • From: Pratik Desai <pdesai1 at umbc.edu>
  • Date: Sun, 2 Oct 2005 01:54:42 -0400 (EDT)
  • References: <200510010655.CAA13187@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Tom De Vries wrote:

>Hello everyone,
>
>Sorry if this is an obvious question.  I'm wondering why the two results
>below are different?
>
>I'm creating programs to generate test questions, and I need to know that my
>computer generated answers will match the student answers, to say, three
>decimal places.  So the answer is -0.0625  "exactly", the first result makes
>sense to me, the second doesn't.
>
>If there is a reason for this, is there are way to insure I can make the
>first result look like the second result all the time??
>
>
>SetAccuracy[-0.0625,4]
>
>-0.063
>
>ToString[SetAccuracy[-0.0625,4]]
>
>-0.062
>
>
>Thanks for your input!
>
>
>Tom De Vries
>
>  
>
This is another example of the result being displayed in OutputForm 
(used in ToString)

SetAccuracy[-0.0625, 4]
 >>-0.063
SetAccuracy[-0.0625, 4] // OutputForm
 >>-0.062
SetAccuracy[-0.0625, 4] // ToString
 >>-0.062

Although when you set the accuracy to 5 all of the above work

 >>-0.625


See help on OutputForm for more details

Hope this helps

Pratik .




-- 
Pratik Desai
Graduate Student
UMBC
Department of Mechanical Engineering
Phone: 410 455 8134



  • References:
    • Rounding?
      • From: Tom De Vries <tom_toad@telus.net>
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