Ping Yeh wrote: > Hi, > > I have (x,y) data that I want to fit to the formula > y = a * x^b > to determine a and b. How can I do it? The current > manual only lists linear fit and polynomial fit. >
If you just want quick power law fit without turning to the other solutions, you can just transform your variables to make it a linear fit problem: log(y) = log(a * x^b) = log(a) + b * log(x) So just do the linear regression with the logarithms of x and y, and the slope you get back will be b, and the intercept will be log(a). Ryan -- Ryan May Graduate Research Assistant School of Meteorology University of Oklahoma ------------------------------------------------------------------------- SF.Net email is sponsored by: The Future of Linux Business White Paper from Novell. From the desktop to the data center, Linux is going mainstream. Let it simplify your IT future. http://altfarm.mediaplex.com/ad/ck/8857-50307-18918-4 _______________________________________________ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
