Fit a curve of equation of form y = ax^b to data

22 views (last 30 days)
Answered: hitesh Mehta on 17 Feb 2018
Hi,
How do I fit a curve of equation of form y = ax^b to my data. I have x and y values. I have to find a and b (it can be a fraction) and plot the curve.
Sussana Okeleye on 2 Dec 2015
Hi , did you ever figure out how to do this?

Honglei Chen on 19 Jun 2012
If you have Curve Fitting Toolbox, you can use that to do an exponential fitting directly
If not, you can take logarithm of both sides and translate that into a linear fitting problem, i.e.
log(y) = log(a)+b*log(x)
and then use polyfit

Sean de Wolski on 19 Jun 2012
Any of these are designed for this.
• lsqcurvefit Optimization Toolbox
• nlinfit Statistics Toolbox
• NonlinearModel Statistics Toolbox >= R2012a.

hitesh Mehta on 17 Feb 2018
Hi,
How do I fit a curve of equation of form y = ax^b+c to my data. I have x and y and c values.
I have to find a and b(it can be a fraction) and plot the curve.

Categories

Find more on Get Started with Curve Fitting Toolbox in Help Center and File Exchange

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!