To find the exponent for a data

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 ?

Answer 1

[Laurent]

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'

[Gokul Raju]

Thanks Laurent. Very useful, could try various options that are there to fit the data.