| Author |
Comment/Response |
Yan
|
 07/15/12 05:56am
Hello,
this is a problem that's driving me crazy. I have some simple experimental data (about 80 data points) which I want to fit to an exponential curve (a*exp(bx)).
The ListPlot looks fine. It's a relatively "flat" curve, I'm guessing b lies between 10^-3 and 10^-5. I have tried to fit the data with FindFit, NonlinearModelFit. I have even done a linear fit, which works just fine (although of course it's not what I want).
But whenever I try to fit the curve to an exponential function, Mathematica returns b = 1 and that the precision goal was not met. I have tried adjusting the MachinePrecision, PrecisionGoal and WorkingPrecision, all to no avail.
I have attached the data with a ListPlot and two failed fits.
Since I can't wrap my head around it, I'm hoping that you can.
Any help would be appreciated, thanks in advance!
Greetings,
Yan
Attachment: ExpFit.nb, URL: , |
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