Re: Forcing a Fit through a Data Point (Mathematica 5)

• To: mathgroup at smc.vnet.net
• Subject: [mg43611] Re: [mg43588] Forcing a Fit through a Data Point (Mathematica 5)
• From: Hugh Walker <hwalker at gvtc.com>
• Date: Tue, 23 Sep 2003 04:02:08 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

```On Monday, September 22, 2003, at 02:14 AM, Hank Shih wrote:

> Hello all. I have a set of data for a experiment and I want to create
> the best fit line. Based on the x-y coordinate system, I need the line
> to go through (0, 0) no matter what. The data is as followed: data =
> {{0,0}, {.5,.25}, {1,.4}, {1.5,.5}, {2,.625}, {2.5,.84615}, {3,1},
> {3.5,1.0588}}.
>
>
> data = {{0,0}, {.5,.25}, {1,.4}, {1.5,.5}, {2,.625}, {2.5,.84615},
> {3,1}, {3.5,1.0588}}.
>
> abc = Fit[data, {1, x, x}, x]
> Plot[abc, {x, 0, 5}, GridLines -> Automatic, AxesLabel -> {"Time (in
>        sec)", "Change in Distance (in cm)"},
>    Epilog -> {PointSize[0.02], Map[Point, data]}]
>
> Is there a easier way to do this through Mathematica 5? If not, how can
> I force it through that (0, 0) point? Thanks in advance
>
> Hank

Hank:

This will do it:

Fit[data, {x}, x]

Regards
==========
Hugh Walker
Gnarly Oaks

```

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