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MathGroup Archive 2005

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Re: Why won't Horner[] work?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg59019] Re: [mg58978] Why won't Horner[] work?
  • From: Bob Hanlon <hanlonr at cox.net>
  • Date: Wed, 27 Jul 2005 01:24:40 -0400 (EDT)
  • Reply-to: hanlonr at cox.net
  • Sender: owner-wri-mathgroup at wolfram.com

Did you load the package first?

Needs["Algebra`Horner`"];

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

(0.00502513 x-2.01508) x+202.01


Bob Hanlon

> 
> From: Paul McHale <paul.mchale at _NO_$PAMearthlink.net>
To: mathgroup at smc.vnet.net
> Date: 2005/07/26 Tue AM 04:01:43 EDT
> Subject: [mg59019] [mg58978] Why won't Horner[] work?
> 
> 
> 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
> 
> 


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