Re: Questions on fitting and plotting data

• To: mathgroup at smc.vnet.net
• Subject: [mg8115] Re: Questions on fitting and plotting data
• From: dreece at atl.mindspring.com (Daryl Reece)
• Date: Tue, 12 Aug 1997 00:54:55 -0400
• Organization: MindSpring Enterprises, Inc.
• Sender: owner-wri-mathgroup at wolfram.com

```Daniel Goscha <dgoscha at phy.ilstu.edu> wrote:

>In[38]:=
>t2 = {{1, 1.5, .5}, {2.3, 2.8, .5}, {3, 3.7, .5}, {4.2, 4.6, .5},
>  {5.1, 5, .5}, {6.4, 6.4, .5}, {7.2, 7.7, .5}, {8, 8.9, .5}}
>Out[38]=
>{{1,1.5,0.5},{2.3,2.8,0.5},{3,3.7,0.5},{4.2,4.6,0.5},{5.1,5,0.5},{6.4,6.4,

>    0.5},{7.2,7.7,0.5},{8,8.9,0.5}}

The data needs to be ordered as {{x1,y1,f1},{x2,y2,f2},...}.  To
perform a 2-d fit up to 1st order use

Fit[t2, {1,x,y}, {x,y}]

It apperas the fit you generated is good since the function value is
0.5 for all values of x and y.

Everything else appears to be correct.
>In[40]:=
>fit1 = Fit[t2, {1, x }, {x, y}]
>Out[40] =
>0.5-5.55112x10^-17 x

>In[41]:=
>Plot [fit1, {x, 0, 10}]

>In[37]:=
>Show [%,  plot1]

>Any help will be greatly appreciated.  Many thanks

>-daniel
>--------------------
>daniel l. goscha
>dgoscha at phy.ilstu.edu
><*>

```

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