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To find the exponent for a data

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Gokul Raju
Gokul Raju on 23 Oct 2013
Commented: Gokul Raju on 23 Oct 2013
I have a non-linear data of the form: y=x^a. The data looks more like an exponential curve and I wanted to find the best value for 'a'.
Can you please suggest how to fit the data and obtain 'a' using MATLAB ?

Accepted Answer

Laurent
Laurent on 23 Oct 2013
Edited: Laurent on 23 Oct 2013
If you want to do this only once, you could use the Curve Fitting Tool using the command 'cftool'. You only need a variable with your x-values and a variable with y-values. Select them in the Tool and select the appropriate function.
If you want to do this in a script or function, or on the command line, you can use 'lsqnonlin'
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Gokul Raju
Gokul Raju on 23 Oct 2013
Thanks Laurent. Very useful, could try various options that are there to fit the data.

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