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MathGroup Archive 2006

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RE:Beginner--[Please Help]How to get coefficient list issued from a Series Command

  • To: mathgroup at smc.vnet.net
  • Subject: [mg70330] RE:Beginner--[Please Help]How to get coefficient list issued from a Series Command
  • From: abdou.oumaima at hotmail.com
  • Date: Fri, 13 Oct 2006 01:30:25 -0400 (EDT)

Hello everybody,
Thank you for all your suggestions but all what I need is to sum the coeficients of my K list.  I do this:

<< DiscreteMath`RSolve`
K = {a1 + b1 x + c1 x^2 , a2 + b2 x + c2 x^2, a3 + b3 x + c3 x^2};
Sum[SeriesTerm[K[[i + 1]], {x, 0, 0}], {i, 0, 2}]
Sum[SeriesTerm[K[[i + 1]], {x, 0, 1}], {i, 0, 2}]
Sum[SeriesTerm[K[[i + 1]], {x, 0, 2}], {i, 0, 2}

Out[1]= a1 + a2 + a3
Out[2]=b1 + b2 + b3
Out[3]=c1 + c2 + c3

Is there any way to do more simply than that. Because with a very big list the SeriesTerm does not give me the right result.


Cheers.
Lian.

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