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MathGroup Archive 2003

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bug in CoefficientArrays?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg43923] bug in CoefficientArrays?
  • From: Mark Fisher <mark at markfisher.net>
  • Date: Sun, 12 Oct 2003 04:03:43 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

FYI: This looks like a bug to me:

In[77]:=
poly=a+(1-b)(c-d)x-e y;
{m0,m1}=CoefficientArrays[poly,{x,y}];
m0+m1.{x,y}-poly//Simplify

Out[79]=
(d-b d+c (-1+b+b d)) x

--Mark


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