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MathGroup Archive 2000

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FunctionExpand bug. Serious.

  • To: mathgroup at
  • Subject: [mg25656] FunctionExpand bug. Serious.
  • From: Jack Goldberg <jackgold at>
  • Date: Wed, 18 Oct 2000 02:52:27 -0400 (EDT)
  • Sender: owner-wri-mathgroup at

Hi Group,

I posted a bug notice and someone was kind enough to point 
out an error in my polynomial example.  The bug appears in 
using FunctionExpand on 

p[x] = x^6-x^4+2x^2-10

that is,  

FunctionExpand[ UnitStep[p[x]] ] 

returns 0 when it should return a sum of 2 two UnitSteps.


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