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