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From: | Ben Abbott |
Subject: | Re: Non linear equations: howto? |
Date: | Mon, 20 Oct 2008 05:46:01 -0400 |
On Oct 20, 2008, at 12:47 AM, Fabrice DELENTE wrote:
My problem is that I have the curve of f, and I'd like to find its equation; I guessed that f is of the form (a*x+b)*exp(c*x+d)+e, and I'm trying to findthe right values for a,b,c,d and e.This is impossible to solve. E.g. d can be anything, so I suggest makingit 0.Well I tried on geogebra to find a solution visually, and it seems possible;why do you say it is impossible?
You problem requires a non-linear solution of six eqns for 5 unknowns.There can be many locally minimal solutions, and (generally) no way to determine how many local minima exist or where they are.
Ben
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