       Re: A question of Fit

• To: mathgroup at smc.vnet.net
• Subject: [mg32208] Re: A question of Fit
• From: "John Doty" <jpd at w-d.org>
• Date: Sat, 5 Jan 2002 00:11:08 -0500 (EST)
• References: <a13v0b\$dfo\$1@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

```In article <a13v0b\$dfo\$1 at smc.vnet.net>, "none" <none at none.com> wrote:

> I'd like to fit data of two independent variables, similar to the
> typical
>
> Fit[data, {1, x, y, TBD}, {x, y}]
>
> (data of the form      {{x1, y1, z1}, {x2, y2, z2}, ..., {xn, yn,
>      )
>
> I have enough knowledge of the data to state that
>
> z [x, 0]  = = x
>
> Is there a way to force a fitted function to pass through the known
> points at y = = 0?

Subtract x from z to make a new function w. Now w[x,0]==0. Choose as
your fit functions suitable functions equal to zero when y==0, like y,
y^2, x*y, Cos[x]*Sin[y], etc.

--
| John Doty		"You can't confuse me, that's my job."
| Home: jpd at w-d.org
| Work: jpd at space.mit.edu

```

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