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Re: Curve Fitting Problem
From: |
Sergei Steshenko |
Subject: |
Re: Curve Fitting Problem |
Date: |
Thu, 26 Jun 2008 19:52:32 -0700 (PDT) |
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--- On Thu, 6/26/08, A. Kalten <address@hidden> wrote:
> From: A. Kalten <address@hidden>
> Subject: Curve Fitting Problem
> To: address@hidden
> Date: Thursday, June 26, 2008, 3:57 PM
[snip]
> I suspect that the only solution would be to write a
> custom least squares program.
>
> AK
>
>
Maybe not.
If I understand your problem correctly, is more or less like this;
1) there is f(x) to be approximated;
2) the desired approximation is:
a * x^2 + b * x + c;
3) for example, 'a' above is for whatever reason predetermined.
Then, I think, you need to approximate
f(x) - a * x^2
with
b * x + c
, i.e. you can use the existing curve fitting function on a different
input function.
Regards,
Sergei.
Re: Curve Fitting Problem, Peter Cloetens, 2008/06/27
Re: Curve Fitting Problem, Fredrik Lingvall, 2008/06/27