MATLAB: Data fitting

Question

I'm trying to plot a curve to fit a given set of population data. I am told to follow the format

P(t) = exp(a*(t - t_0)^2 + b*(t - t_0) + c*(t - t_0))

using built-in Matlab tools. I have found the basic fitting GUI offered under the figure tool bar, but nothing is of help there. Any helpful functions that anyone might want to suggest?

Answer 1

This is easy with the Ezyfit toolbox: http://www.mathworks.com/matlabcentral/fileexchange/10176

Plot your data, and type showfit('P(t) = exp(a*(t - t_0)^2 + b*(t - t_0) + c*(t - t_0))')

See the doc to specify starting values for the parameters a b c and t0.

I hope this helps, F. Moisy