Re: fixed points piecewise-linear fitting

[Ben Abbott]

On Mar 17, 2012, at 2:22 PM, Sergei Steshenko wrote:

> ----- Original Message -----
>> From: Ben Abbott <address@hidden>
>> To: Sergei Steshenko <address@hidden>
>> Cc: help-octave Octave <address@hidden>
>> Sent: Saturday, March 17, 2012 6:39 PM
>> Subject: Re: fixed points piecewise-linear fitting
>> 
> [snip]
>> 
>> I mean that linear least squares can be used to solve this problem.
>> 
>> Ben
> 
> I am not sure - because of _piecewise_-linear requirement. I am not even sure 
> only one solution exists.
> 
> Regards,
>   Sergei.

After taking a closer look, I agree. A linear least squares approach will not 
work.

Since I've been wanting a function that does this sort of thing, I put coded a 
simple solution that results a piece-wise polynomial.

It includes the tex-info help as well as a demo. I used fsolve() to determine 
the interpolating values. So, it is not speedy or efficient.

Ben

ppolyfit.m
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