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MathGroup Archive 2005

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Re: Why won't Horner[] work?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg59024] Re: Why won't Horner[] work?
  • From: "Carl K. Woll" <carlw at u.washington.edu>
  • Date: Wed, 27 Jul 2005 01:24:45 -0400 (EDT)
  • Organization: University of Washington
  • References: <dc4r39$i9$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

"Paul McHale" <paul.mchale at _NO_$PAMearthlink.net> wrote in message
news:dc4r39$i9$1 at smc.vnet.net...
>
> 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
>

Horner is actually from a standard addon package, so you need to load the
package first:

Needs["Algebra`Horner`"]

Then, Horner will work.

Note that if you are interested in doing polynomial fits, then another
option is to use the package NumericalMath`PolynomialFit.

Carl Woll
Wolfram Research




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