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MathGroup Archive 1999

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Rationalize[] in Mathematica3 vs. Mathematica4

  • To: mathgroup at smc.vnet.net
  • Subject: [mg20173] Rationalize[] in Mathematica3 vs. Mathematica4
  • From: "Gianluca Gorni" <gorni at dimi.uniud.it>
  • Date: Sun, 3 Oct 1999 21:07:40 -0400
  • Sender: owner-wri-mathgroup at wolfram.com

Hello!

I have run Mathematica 4 on a program that I had tested with
Mathematica 3, and I noticed funny outputs. I traced the
problem to the function Rationalize[], which seems
to be different in the two version.

With the following input

 In:    Rationalize[0.6000000000000001`]

Mathematica 3 gives

 Out:   3/5

while Mathematica 4 gives

 Out:   1351079888093186/2251799813488643

Is this change in behaviour intentional?

To get the same result as before from my program
I had to write Rationalize[x, .001] instead of
Rationalize[x].

              Gianluca Gorni
--


 +---------------------------------+
 | Gianluca Gorni                  |
 | Universita` di Udine            |
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