Re: exponential fitting

[Ben Sapp]

Hi Grundmann,

I had to solve a similar problem: y = c1*exp(a*(t-t0) -c2*exp(b*(t-t0)) 
.    I ended up using Ettiene Grossman's "minimize" function which 
accomplishes the same task as fmins.   minimize comes in the octave-forge 
package.( http://octave.sourceforge.net )  For my problem it was 
excruciatingly slow but worked.  It was slow more because my problem is 
very badly behaved when a ~= b.

Hope this helps,

Ben Sapp.

At 04:58 PM 9/3/2002 +0200, address@hidden wrote:
> Hey,
>
> I would like to use Octave evaluating my data as I did with Matlab before, 
> but I can't find a function for an exponential fit.
> In Matlab I wrote a small function producing something like y=c*exp(a*x)+b 
> and minimized the error between this function and the real data using fmins.
> Is there any equivalent for fmins in Octave or maybe a build-in 
> exponential fit? Or how do you do an exponetial fit? Because I think this 
> is quite common.
>
> thanks
>
> grundmann
>
>
>
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