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## Re: exponential fitting

 From: Ben Sapp Subject: Re: exponential fitting Date: Thu, 05 Sep 2002 09:39:07 -0600

```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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