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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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Octave is freely available under the terms of the GNU GPL.
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