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MathGroup Archive 2000

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bug in Root in Version 3?

  • To: mathgroup at
  • Subject: [mg23894] bug in Root in Version 3?
  • From: Gianluca Gorni <gorni at>
  • Date: Thu, 15 Jun 2000 00:51:34 -0400 (EDT)
  • Sender: owner-wri-mathgroup at


I wrote a program that runs fine in version 4. When I tried it in
version 3 I saw different results. I traced the problem to
the function Root. It seems that V.3 Root does not necessarily
order real roots in increasing order.


Table[Root[2 + 12#1 - 14#1^3 &, n], {n, 3}] // N


{1., -0.827327, -0.172673}

SetOptions[Root, ExactRootIsolation -> True] does not seem to
affect the result.

$Version:  "Solaris 3.0 (August 21, 1997)"

          Gianluca Gorni

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