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MathGroup Archive 2005

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Re: Why won't Horner[] work?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg59015] Re: Why won't Horner[] work?
  • From: Jean-Marc Gulliet <jeanmarc.gulliet at gmail.com>
  • Date: Wed, 27 Jul 2005 01:24:37 -0400 (EDT)
  • Organization: The Open University, Milton Keynes, U.K.
  • References: <dc4r39$i9$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Paul McHale wrote:
> When I issue the command:
> 
> In:= Fit[ {{1,200},{200,0},{400,200}}, {1,x,x^2}, x]
> 
> Out:= 202.01 - 2.01508 x + 0.00502513 x^2
> 
> This seems good.  But when I do
> 
> 
> In:= Horner[Fit[ {{1,200},{200,0},{400,200}}, {1,x,x^2}, x]]
> 
> Out:= Horner[202.01 - 2.01508 x + 0.00502513 x^2]
> 
> 
> Why doesn't it evaluate the polynomial?  To I need to convert the
> output of fit?
> 
> Thanks,
> Paul
> 
Hi Paul,

You must load the package *Algebra`Horner* before you can use the 
instruction *Horner[]*.

In[1]:=
Needs["Algebra`Horner`"]

In[2]:=
Horner[Fit[{{1, 200}, {200, 0}, {400, 200}},
    {1, x, x^2}, x]]

Out[2]=
202.0100502512563 + (-2.0150753768844227 +
     0.005025125628140706*x)*x

Best regards,
/J.M.


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