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MathGroup Archive 2005

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Re: Why won't Horner[] work?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg59054] Re: [mg58978] Why won't Horner[] work?
  • From: yehuda ben-shimol <bsyehuda at gmail.com>
  • Date: Thu, 28 Jul 2005 02:25:59 -0400 (EDT)
  • References: <200507260801.EAA00248@smc.vnet.net>
  • Reply-to: yehuda ben-shimol <bsyehuda at gmail.com>
  • Sender: owner-wri-mathgroup at wolfram.com

It seems that you forgot to upload the Horner package
Before calling to Horner evaluate the following command
<< Algebra`Horner` 
then
In:= Horner[Fit[ {{1,200},{200,0},{400,200}}, {1,x,x^2}, x]]
Out:= 202.01\[InvisibleSpace] + (-2.01508 + 0.00502513 x) x
yehuda 

On 7/26/05, Paul McHale <paul.mchale at _no_$pamearthlink.net> 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
> 
>


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